Concrete Slab Deflection Calculator

Beam Deflection Calculators - Solid Rectangular Beams, Hollow Rectangular Beams, Solid Round Beams Enter value and click on calculate. If S is denote spacing ofthe reinforcement and N is the Numberofbars used in 12" widththe one maywrite the following: _ as p sd As =as N, as is the. Effective Moment of Inertia Approach for Predicting Deflection of Concrete Beams Reinforced with Twisted Bamboo Cables Akmaluddin*, Pathurahman B. The test results are summarized in the following graph: Shear capacity 0 20 40 60 80 100 120. being developed to predict the deflections of two-way slabs which will form the basis of new design design rules to be released in the future. as to the action of concrete slabs under load. You can also use it for singly reinforced section, just by entering compression rebar equal to zero. Some codes specify deflection or span-depth ratio limit and others specify vibration limit using natural frequency or acceleration. For example, in case of thin and lightweight slabs. Columbus, Ohio 43216-0398 (to find us take I-71 to State Route 104; turn east to Haul Rd; follow the signs) Phone 614-443-0123 • Fax 614-443-4001. reinforced concrete slabs under low levels of stress. Beam Deflection Engineering Calculators Civil Engineering Resources. Membrane action m slabs, crackmg, deflection and ultlmate loadof concrete slab systems, ACI, SP-30, 1971, 345-377. Concrete Calculator : Chemical Periodic Table : Convert Units of Pressure : Cantilever Beam Calculator : Slab Concrete Pour Calculator : Ready Mix Concrete Volume Calculator : Speed Distance Time Calculator: Calculate Deflection for Solid Rectangular Beams : Calculate Deflection for Hollow Rectangular Beams : Calculate Deflection for Solid. Deflection of slender tilt-up wall panels can also be underestimated with Branson's equation. The common methods are; 1. One-way slabs:. Gelfi and E. In this situation the nominal thickness of the concrete over the complete span may be assumed to be increased by 0,7δ. Concrete Design and Construction 6. Uniform Load Design Calculation Details Name: Sample Project Slab Thickness h = 6. Columbus, Ohio 43216-0398 (to find us take I-71 to State Route 104; turn east to Haul Rd; follow the signs) Phone 614-443-0123 • Fax 614-443-4001. CE 433, Fall 2006 Deflection of a Reinforced Concrete Beam Overview The deflection of reinforced concrete beams is complicated by several factors. Deflection of two way slabs is entirely different from one way slab or beams. Troweling shall begin after surface has received a float finish. The principal material parameters that influence concrete deflection are modulus of elasticity, modulus of rupture, creep, and shrinkage. 2 (3000/367. Le2 ABSTRACT Deflection and vibration play an important role on the serviceability of bridges. Strength increase by 33% to 50% Deflection reduced by 70% to 80% Can attain either longer spans or smaller members - more economical in long spans Smaller floor depth, therefore reduced. A beam is a flexure member. The slab drying must proceed naturally and. 3L for parabolic haunches, & 0. Moment Capacity Calculations Step by Step process: Step 1 : Calculate depth of rectangular stress block, “a”, using Equation 2. Samuel Easterling2 SUMMARY Two procedures for calculating the strength and stiffness of composite slabs based on a partial interaction model are introduced. calculate the area of tensile reinforcement (As) and select the bars one way concrete slab. ConCrete Plus generates the reinforcement drawings. overload 42. This page can be used to find the deflection, and also the maximum stress of a simply supported beam, the calculator always factors in the beams own weight and adds it to the loads you specify. 2L for drop panel haunches. Design of fibre reinforced concrete Adfil® Durus Structural concrete slab design There are many methods to design ground supported concrete slabs. Gelfi and E. 5m grid with 250mm depth • 5kg/m2 or 4. reinforced concrete slab models, of different end conditions, were built and tested for deflections utter uniform loadings# Theoretical aid. AHMED HASSAN HAFEZ 19,233 views. But we used Timoshenko's classic Text "Theory of Plates and Shells" and depending on the load (magnitude and distribution) and slab thickness and the boundary condi. The paper considers a flat slab floor with 8. for Dial Gage No. casting the slab above will be greater than service loads and will govern long-term slab deflections. On the right side of this tab are all the required rebar, concrete strength and elastic modulus entries, shear stirrup data, strength reduction factors and deflection criteria to check. Reinforced Concrete Design to BS8110 Structural Design 1 - Lesson 5 1 Lesson 5: Deflection in reinforced concrete beams Content 4. Deflection reports the total deflection from both DEAD and SDEAD cases, however, the increase in DEAD load deflection due to additional cracking from SDEAD load application is not recognized, therefore we do not recommend this method. As steel is more elastic than concrete, it shows elasticity like rubber. Deflection of 5 mm has been taken into account in the calculation. 4 m panel dimensions and deflections exceeding 80 mm at mid-panel. The floor flatness for an elevated concrete slab decreases with time due to initial deflection caused by the slab’s dead weight and long-term deflection due to creep and shrinkage of the concrete. Verification Examples is a collection of calculation examples that compare FEM-Design analysis with hand calculations. Design of fibre reinforced concrete Adfil® Durus Structural concrete slab design There are many methods to design ground supported concrete slabs. It may refer to an angle or a distance. Simplified procedures for calculation of instantaneous and long-term deflections of reinforced concrete beams José Milton de Araújo1 Department of Materials and Construction, University of Rio Grande - FURG Campus Carreiros, Av. It’s crucial to accurately estimate how much concrete you’ll need for a poured slab. Cracked-slab deflection. If the allowable values are exceeded, the calculation results tables will display the following:. The floor slab may be in the form of a precast concrete slab or a composite slab with metal decking (either shallow or deep decking may be used). Comparison of deflection calculations and span-to-depth ratios in BS 8110 and Eurocode 2 term cur v atures in reinforced concrete slabs can be. Deflection during construction of composite slabs with 30-foot bays can double as a result of switching from A36 steel and Allowable Stress Design to Grade 50 steel and Load and Resistance Factor Design. Reinforced slab. Engineering Calculators Menu Engineering Analysis Menu. ConcreteNetwork. Beam Deflection Engineering Calculators Civil Engineering Resources. Concrete cover for reinforcement in Slabs, Footings, Beams, Columns. com Figure 1: Lusas deflection prediction output for a prow end of St George Wharf. Place, strike off, consolidate, level and float to the proper elevation. 1 - Stress limits at transfer. In modeling the project on ETABS I set the property modifiers for slab (thin shell as 0. Two methods for calculating deflection are presented below, and these are based on the advice in TR58 Deflections in concrete slabs and beams8 Rigorous method The rigorous method for calculating deflections is the most appropriate method for determining a realistic estimate of deflection. Beam Deflection Equations are easy to apply and allow engineers to make simple and quick calculations for deflection. The aims and objectives of the present PhD thesis are: - determining the relationship between elastic and real long-term deflections in concrete slabs; - determining the influence of the embedded reinforcement on long-term deflection of reinforced concrete slabs;. after that shall I calculate the reinforcement in the beam and then the slab deflection? I'sd say you should calculate reinforcement in the beam first to know how to reduce stiffness > calculate the model with updated IY for beams > calculate slab deflection. I am currently study in civil engineering and taking my final year project for degree graduation. This calculator uses FPS/US Customary Units. An experimental investigation is performed on four simply supported Light-Weight Concrete (LWC) one-way slabs subjected to immediate loading at 14 d. Report 0-5320-P3 9. NOTE: It is important to know how this module operates with regard to beam stiffness along the span, and how this affects multi-span beams. The slab drying must proceed naturally and. In order to use this method, designers use the insulation or subgrade response factor referred to as the modulus of. loads immediately after stressing. It also checks for minimum steel for crack control as well as steel for balanced section. Please Contact Us is you require specific information regarding your project. The concrete slab acts as a wider and thicker compression flange. The design strength of the slab concrete was 35 MPa and that of columns was 30 MPa. The time of the initial deflection prediction was assumed to be the time immediately after pouring concrete for the Nth floor. Slab Point Deflection example: Slab Strip Deflection Example: Long Term Deflection. It is the same for overhead or underground parking areas, office buildings, records offices, hospitals, etc. If these options are implemented properly, the result could be more cost effective compared to. cracked reinforced concrete slab load-deflection behaviour is considered upto yield line load. The test slabs, which were six-ft square and 1. The unit weight of reinforced concrete is assumed to be 24 kN/m3. actual deflection of reinforced concrete slabs are cor^ared# The. Beam Deflection Engineering Calculators Civil Engineering Resources. The deformation of a beam is generally occurred in connection with its deflection from its actual unloaded position. This construction sheds light on the most vital and leading reasons. Concrete slab deflection STRAP calculates the linear elastic deflection of a concrete slab based on the gross cross-section moment-of-inertia. With respect to serviceability, codes permit thinner slab thicknesses when computed deflections are within prescribed limits. The importance of span/depth rules for controlling deflection in reinforced concrete design is often underestimated. 0 Introduction In 1989 the Structural Division of the South African Institution of Civil Engineers created a sub-committee to examine the design of prestressed concrete flat slabs. Moreover, the downward deflection due to girder self-weight is computed based on the clear span length of the member. Without significantly increasing the slab depth and weight compared to those of composite slabs with typical span, it was found that these long span slabs showed good performance under the load tests. Landis (Eds) 1. 6 - Flexure Design Design Step 5. DEFLECTION CONTROL THROUGH LIMITATIONS ON SPAN TO DEPTH RATIOS For common residential and commercial buildings, designers can forego deflection calculation, if the stiffness of the member selected is large enough. For Soil Supported Beams, Combined Footings, Slab Strip or Mat Strip of Assumed Finite Length with Both Ends Free. Bolander and E. The in situ concrete slab floor are built using form-work, which is commonly made of wooden planks & boards, plastic or steel. Watch some videos, look at the brochures or read more about the advantages of ConCrete. This construction sheds light on the most vital and leading reasons. If these options are implemented properly, the result could be more cost effective compared to. Robert is a Reader in Concrete Structures at Imperial College London. Crack width calculation, where applicable, is also discussed. DAMAGED PLASTICITY MODELLING OF CONCRETE IN FINITE ELEMENT ANALYSIS OF REINFORCED CONCRETE SLABS. That would require calculating the failure point of a two inch slab of concrete, in bending, involving the psi strength of the concrete, and the aggregate size. concretecentre. ( actual program is available in super civil cd) member designation: span of member [ m ] width of web [ mm ] depth [ mm ] clear cover to reinforcement. Mostly determined by deflection/ durability considerations, however, make sure that the Calculate the design concrete shear stress, vc, from: vc = 0. For the measurement the slab was selected, which is located in a multifunctional building in Brno in Houbalova Street. Concrete Slab Reinforcement. The tables below give equations for the deflection, slope, shear, and moment along straight beams for different end conditions and loadings. 1-flat roofs immediate deflection due to live load = L/180. by Douglas Sarkkinen. Hansson, University of Waterloo. For ACI displayed values of deflections are the total long-term ones. Explore other calculators related to housing or building, as well as hundreds of other calculators addressing finance, math, fitness, health, and more. The measurement was carried out by a precise levelling method. 8—Allowable deflections Appendix A4, p. His research interests encompass long term deflections of reinforced concrete slabs, beam-column joints, shear in beams, punching shear, numerical modelling of reinforced concrete structures, strut and tie modelling, and control of early age thermal cracking. Composite beams are normally hot rolled or fabricated steel sections that act compositely with the slab. For the Rebound Hammer test results, the concrete strength average is 214 kscas shown in Table 2 that means the slab concrete strength is rather common for the building construction. For lower loads they can have constant. Є sh is the shrinkage of the plain concrete; ᵨ is the area of steel relative to that of concrete; K is a coefficient, taken as 25 for internal exposure and as 15 for external exposure. Priyanka Bhivgade for submitting her research on “Analysis and design of prestressed concrete box girder bridge” to us. This limit may be exceeded if camber is provided so that the total deflection minus the camber does not exceed the limitation. Because of ponding deflection caused by wet concrete, the use. Give these calculations to your ready-mix supplier or use them to estimate how many 40, 60 or 80 lb. Due to typical boundary conditions the deflection is less than the case of one way slab which deflect in cylindrical. Clemson University 2. calculations of deflection are relatively crude and unreliable and excessive slab deflection is a common problem. Introduction This paper considers the innovative composite behaviour between structural steel beams and precast. Beam Deflection Engineering Calculators Civil Engineering Resources. The traditional gray exterior concrete slabs and interior concrete floors we pour are all steel trowel finished for a smooth texture. 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures FraMCoS-9 V. 1) The connections of a cast-in-place reinforced concrete frame usually transfer moment. Clemson University 2. deep, were reinforced with Intermediate grade steel (yield stress. Using an allowable concrete stress of 45% of the minimum specified compressive strength of 4,000 psi, the allowable compressive stress would be 1,800 psi. Here ratio of longer span of slab to the shorter span of slab is greater than 2. Weight of a Slab (TW): The calculator returns the weight of the slab in pounds. 22 February 2008 12 Concrete strength at a time t (3. Deflection can be checked by two methods. That’s based on national averages of around $5 per square foot for a fully engineered, finished concrete slab, including labor and materials. being developed to predict the deflections of two-way slabs which will form the basis of new design design rules to be released in the future. The one-way slabs are economical up to the span of 3. Rostom Fadzter Media Page-9 Specific Program Scope: • Analysis of Single Span Beams for Shear, Moment and Deflection values at every point on the beam span. To use the Concrete Slab Calculator, simply enter the width, length, and thickness of your pour. Best Answer: As was correctly stated earlier, the max bending moment is based on the way the slab is supported. If you know the maximum deflection for relevant load case, we can check whether it is with in the limit. The measured bearing capacity of the specimen can reach more than 70% of the theoretical calculation strength under the fully composite state. This paper stems from a continuing study of the serviceability of concrete structures at the University of New South Wales. In order to use this method, designers use the insulation or subgrade response factor referred to as the modulus of. Curvature in a simply supported slab. If the allowable values are exceeded, the calculation results tables will display the following:. (2008) measured long-term deflections of slabs loaded at ages of 3, 7, 28 days. Once grasped Yield Line Design is an exceedingly powerful design tool. if possible to get in ROBOT. With respect to serviceability, codes permit thinner slab thicknesses when computed deflections are within prescribed limits. This page can be used to find the deflection, and also the maximum stress of a simply supported beam, the calculator always factors in the beams own weight and adds it to the loads you specify. This totals. As well as the self weight of the fresh concrete, EN 1991-1-6 specifies an imposed load. 6 - Flexure Design Design Step 5. Detailed calculations can account for cracking of member and loss of stiffness. , edge beam dimensions = 14 in. In this article the measurements of the deflection of reinforced concrete slabs are stated, which are then assumed to be compared with different calculation ways. This 'rigorous' method is described in greater detail elsewhere e. The Weight of a Concrete Slab calculator estimates the weight of a rectangle (square) concrete slab. Reinforced slab 1. According to the LRFD design code, if the user invokes the optional live load deflection criteria specified in LRFD Article 3. His research interests encompass long term deflections of reinforced concrete slabs, beam-column joints, shear in beams, punching shear, numerical modelling of reinforced concrete structures, strut and tie modelling, and control of early age thermal cracking. One-way and Two-way Slabs One-way slabs transfer the imposed loads in one direction only. Nevertheless there are still many examples of suspended reinforced concrete slabs that have excessive deflection. Online surveying civil engineering calculators for highways, land and roadways. This paper stems from a continuing study of the serviceability of concrete structures at the University of New South Wales. Design of composite slab, slab capacity and long term deflection calculation need to be car ried out by a qualified structural engineer. You can find comprehensive tables in references such as Gere, Lindeburg, and Shigley. Shrinkage deflection is calculated along with the creep deflection. As suggested by Rajan Sen. (TRAIS) Texas Transportation Institute The Texas A&M University System. ACI 435R-95, “Control of Deflection in Concrete Structures,” states that deflection “can only be esti-mated in the range of 20-40 percent accuracy. Concrete is ordered by volume in cubic yards. 4 Frequently Asked Questions (FAQ) about Flat Plate Voided Concrete Slab Systems [ETN B-4-17] Serviceability Requirements What is the required overall slab thickness to satisfy deflection requirements? Unlike other two-way reinforced concrete slab sys-tems, empirical serviceability requirements for flat plate. Most precast, prestressed concrete is actually pre-tensioned-the steel is pulled before the concrete is poured. These connectors are designed to (a) transmit longitudinal shear along the interface, and (b) Prevent separation of steel beam and concrete slab at the. Making a patio from recycled concrete slabs is both cost effective and good for the environment. 4) for the SFRC and plain concrete slab respectively. Necessary checking such as deflection and crack control is also calculated by the software which helps to improve the accuracy of the design. concretecentre. Slab deflection design by “simplified calculation” will be briefly discussed and. For the measurement the slab was selected, which is located in a multifunctional building in Brno in Houbalova Street. European Commission Joint Research Centre Institute for the Protection and Security of the Citizen Contact information Address: Joint Research Centre, Via Enrico Fermi 2749, TP 480, 21027 Ispra (VA), Italy. #048 Allowable maximum deflection in Beams and slabs Posted by Design Consideration In order to calculate the pressure exerted may be made of plain concrete. Structural steel may be rebar or Welded Wire mesh. Moment Capacity Calculations Step by Step process: Step 1 : Calculate depth of rectangular stress block, “a”, using Equation 2. It also checks for minimum steel for crack control as well as steel for balanced section. deflection criteria can lead to inadequate designs is the transfer stab or "podium slab", used in a type of residential building commonly called a "subterranean apartment building". Giuriani Dipartimento di ingegneria Civile, Università di Brescia, Brescia, Italy. There are also certain cases where a separate calculation of shrinkage deflection is required. Three steel reinforcement ratios are considered which are minimum, maximum and average of them in addition to two concrete compressive strength values of 20 and 30 MPa. With live solving FEA and dynamic hoverable graphs for moment, shear, and deflection, ClearCalcs makes it easy to design and optimise concrete slabs. DEFLECTION 13. 1 - Flexural stress at transfer Design Step 5. The deflection calculation considers the deformation of such a typical region in one direction at a time, alter which the contributions front each direction are added to obtain the total deflection at any point of interest. calculate the area of tensile reinforcement (As) and select the bars one way concrete slab. Furthermore, the downward deflection for superimposed dead load need to be computed on the composite section properties of the girder. Beam Deflection Calculators - Solid Rectangular Beams, Hollow Rectangular Beams, Solid Round Beams Enter value and click on calculate. Crack width calculation for reinforced concrete Guy's I am trying to get detailed calculations for crack widths in RSA, although I input limiting crack widths in the reinforcement calculations, I wondered if there was a detailed output given by robot without going into the spreadsheet calculator extension. The design strength of the slab concrete was 35 MPa and that of columns was 30 MPa. > 2 Way Spanning Concrete Slab Design This spreadsheet allows user to design a two way spanning reinforced concrete slab in accordance with the British Standard BS 8110. 1 Tension 4. Effects of Temperature and Moisture Gradients on Slab Deformation for JPCPs Rania E. online free live maximum floor live load capacity is a great engineering tool to help you calculate floor strength use it now. A short paper 'Span/depth ratios for concrete beams and slabs', by Mr Alasdair Beal, published in The Structural Engineer for April 1983, dealt with the treatment of deflection in CPs 110 and 114. Two methods for calculating deflection are presented below, and these are based on the advice in TR58 Deflections in concrete slabs and beams8 Rigorous method The rigorous method for calculating deflections is the most appropriate method for determining a realistic estimate of deflection. After cracking the curves would not check very well because the effect of the torsional moment would be eliminated sinee in a two-way slab there is no rein­. INSTRUCTIONS: Choose units and enter the following: (L) The length of a slab. Concrete - Calculate Cubic Volume - Calculating required concrete volume Concrete - Properties - Properties of normal strength Portland cement concrete Concrete - Volume Estimate - Estimate required concrete volume per sq. This construction sheds light on the most vital and leading reasons. Instantaneous deflection is generally calculated using concrete’s modulus of elasticity at 28 days, gross-cross sectional area and linear elastic theory. calculations of deflection are relatively crude and unreliable and excessive slab deflection is a common problem. MinimumSlab Thickness Tocontrol excessivedeflection, the following slab thicknessesarerecommended: (2) Steel Spacing Formula Thedesign ofa slab will bebasedonastrip of12in. “Darmstadt Concrete” (Annual journal on Concrete and Concrete Structures) - Enclosure B3. CFRP(carbon fiber reinforced polymer) not only completes the strengthening of beams and columns, but also improves the seismic performance of the structure to a certain extent and meets the requirements of durability. Learning Tool for Reinforced Concrete well established code of practices. Recent Development in Reinforced Concrete Slab Analysis, Design, and Serviceability 7. ROBOT - RC SLAB DESIGN - how ARSA determines deflection for plate and shell in the RC slab required reinforcement module?. Creep Deflections in Slab Buildings and Forces in Shores during Construction by Manuel Aguinaga-Zapata and Zden~k P. Cantilever Beams; Continuous Beams (Part I) Continuous Beams (Part II) Special Topics. Nonlinear analysis of reinforced concrete beams, beam-columns and slabs by finite elements by Kadambi Ramaswami Rajagopal A Dissertation Submitted to the Graduate Faculty in Partial Fulfillment of The Requirements for the Degree of DOCTOR OF PHILOSOPHY Department: Civil Engineering Major» Structural Engineering Approved*. CCL Post-Tensioned Slabs show reduced cracking. calculation methods can be used in a simpler method as the situation warrants. 6—Loads for deflection calculation 4. instantaneous deflection and the stiffness modifier method which is mentioned in Chapter ten of ACI 318-05 for immediate deflection was also implemented for the same reinforced concrete slab based on reducing the flexural rigidity of the slab by the ratio of 0. In other words, is the total long term deflection equal to the sum of (a) +(b) + (c) above? Or am I wrong ?. Our online Steel Beam Calculator and Timber Calculator allows you to design and check steel and timber beams. However, the equation underestimates deflection for steel-reinforced concrete beams and slabs with a reinforcing ratio less than 1% and for most beams reinforced with low-modulus, fibre-reinforced-polymer (FRP) bars. If this is done, even at normal concrete strengths EC 2 would allow slabs supporting light and medium loadings to have span/depth ratios 20-40% greater than current UK practice. In both direction tension reinforcement is 10mm 140 mm c/c. However, the tables below cover most of the common cases. Deflection can be checked by two methods. Naturally, we took the deflection of the concrete· slab at a load tor which there was no cracking and full tor­ sion moment was in effect. Minimize joint edge spalling. Therefore, the slab thickness should be increase. 01 inch differential deflection. The calculated deflection may require adjustment, if the member is likely to crack, when subjected to the design load. Use this beam span calculator to determine the reactions at the supports, draw the shear and moment diagram for the beam and calculate the deflection of a steel or wood beam. 1 - Stress limits at transfer. calculate the area of tensile reinforcement (As) and select the bars one way concrete slab. , and unfactored live load = 100 psf. Click below to see what we've got and what's coming up. It is a beam design calculator that will show every calculation and finally show your check including graphical views. You can find comprehensive tables in references such as Gere, Lindeburg, and Shigley. Deflection of two way slabs is entirely different from one way slab or beams. Design Of Reinforced Concrete Structures ii Two-Way Slabs 1 1. Find out how far your deck joists can span when framing your deck. This free concrete calculator estimates the amount of concrete necessary for a project, and can account for different shapes and amounts of concrete. 4kg eCO2 /m2 18 000 tonnes CO2 per year. Deflection can be checked by two methods. Bolander and E. As of today, between EC2 and Gilbert's work, both provide a way to calculate the deflection of concrete elements taking in consideration creep, shrinkage and the cracking of a 1-way element, but be careful, on EC2 "Simplified creep factors are used and deflection from the curvature of the slab is approximated using a factor. Properties of concrete applied to the slab and columns of each layer are shown in Table 1. develops a practical calculation method for the estimation of deflection and ultimate strength of the fire exposed steel deck composite floor slab by this means, and verifies the validity of this method by comparing to experimental results. They give the DIY concretor easy access to slab calculations, which must be done before pouring a concrete slab. Both vary in material properties and as well as in behavior. 3) Definition limit: –Final deflection of a beam, slab or cantilever ≤span/250 –For deflection which takes place after the application of. Our online Steel Beam Calculator and Timber Calculator allows you to design and check steel and timber beams. Giuriani Dipartimento di ingegneria Civile, Università di Brescia, Brescia, Italy. In most cases design of reinforced concrete beams and slabs is governed by deflection rather than strength. An alternative to elastic analysis is yield line analysis, which provides an estimate of slab bending strength (46,47,52,79). 2L for drop panel haunches. Member Name: Since this is the input for the the exterior portion of the slab use "Exterior Slab" for the name. Robert is a Reader in Concrete Structures at Imperial College London. The advantage of a suspended reinforced concrete slab is that it is possible to get high strength, but at the same time keep the weight low. VERY VERY EXTENSIVE. Where joints are located and when they are placed affect pavement stresses. Beam Deflection Calculators - Solid Rectangular Beams, Hollow Rectangular Beams, Solid Round Beams Enter value and click on calculate. Beam Deflection Tables. = shear strength in concrete design Reinforced Concrete Design Structural design standards for reinforced concrete are established by the Building Code and Commentary (ACI 318-11) published by the American Concrete Institute International, and uses strength design (also known as limit state design). Giuriani Dipartimento di ingegneria Civile, Università di Brescia, Brescia, Italy. 2 Compression 4. Calculate the sustained load plus live load deflection as the deflection from Step 1 less the deflection from Step 2 plus the immediate live load deflection discussed in the previous section. ETABS - 24 Reinforced Concrete Slab Design: Watch & Learn - Duration: HOW TO CALCULATE LONG TERM DEFLECTION USING SAFE 12 - Duration: 10:49. The results of a test on a full-scale 5 m continuous slab are used to study the methods of analysis and calculation of deflection of reinforced concrete flat slabs. It covers the consideration of crack formation and its impact on a concrete floor's deflection, a critical consideration for conventionally reinforced slabs. Structural Calculations – Parking Garage CDRL 03-037. Designs concrete beams and slabs in accordance with ACI 318. Free online beam calculator for generating the reactions, calculating the deflection of a steel or wood beam, drawing the shear and moment diagrams for the beam. This calculator is useful for doubly reinforced rectangular concrete beam with one layer of tension re-bar. being developed to predict the deflections of two-way slabs which will form the basis of new design design rules to be released in the future. CIVL 4135 Deflection CHAPTER 13. Design and Control of Concrete Mixtures, EB001, and Diagnosis and Control of Alkali-Aggregate Reactions in Concrete, IS413. Hansson, University of Waterloo. With respect to serviceability, codes permit thinner slab thicknesses when computed deflections are within prescribed limits. Very easy to use interface. Beam design spreadsheet is a complete solution to hours of calculation of beam design. (ACI 318-05 Table 9. Most reinforced concrete members are statically indeterminate because they are part of monolithic structure, i. How to Control Deflection of Reinforced Concrete Beams and Slabs?. Slab Point Deflection example: Slab Strip Deflection Example: Long Term Deflection. PRESTRESSED CONCRETE FLAT SLABS 1. Despite the negligible difference in instantaneous and short-term deflection, the calculated value for long-term deflection that is due to decrease in stiffness overtime due to the inelastic deformation of concrete shrinkage and creep, is sometimes significantly less than the actual deflection. Reading Assignment Text: Sect 6. The importance of span/depth rules for controlling deflection in reinforced concrete design is often underestimated. deflection of simply supported beam under two-point loading can be computed by using (1). Effective Moment of Inertia Approach for Predicting Deflection of Concrete Beams Reinforced with Twisted Bamboo Cables Akmaluddin*, Pathurahman B. The objectives were to investigate transient thermal gradient (i. Permanently compressing the concrete provides an extra guarantee of waterproofing the building for foundation slabs subject to uplift. Deliver joint stability per industry guides of less than. The value of fct,eff may be taken as fctm or fctm,fl provided that the calculation for minimum tension reinforcement is also based on the same value. Use the slab calculator to figure the concrete needed for the porch surface. In design it is convenient to assume. 4 Reinforcement details 4. DEFLECTION CONTROL THROUGH LIMITATIONS ON SPAN/DEPTH RATIOS For common residential and commercial buildings, designers can forego deflection calculation, if the stiffness of the member selected is large enough. An expression is developed for maximum allowable span-depth ratios for reinforced concrete beams and one-way slabs. CE 433, Fall 2006 Deflection of a Reinforced Concrete Beam Overview The deflection of reinforced concrete beams is complicated by several factors. Deflection of two way slabs is entirely different from one way slab or beams. As well as the self weight of the fresh concrete, EN 1991-1-6 specifies an imposed load. Reinforced slab 1. 1 ANALYSIS AND DESIGN OF FLAT SLABS USING VARIOUS CODES BY M. #048 Allowable maximum deflection in Beams and slabs Posted by Design Consideration In order to calculate the pressure exerted may be made of plain concrete. Loads used in computations are Dead Load (Weight of slab) and 2550 kg/m3 DL (Concrete & Reinforcement) 4. The importance of span/depth rules for controlling deflection in reinforced concrete design is often underestimated. com Figure 1: Lusas deflection prediction output for a prow end of St George Wharf. If you’re unsure about what deflection actually is, click here for a deflection definition Below is a concise beam deflection table that shows how to calculate the maximum deflection in a beam. Bradford2 1 University of Wollongong, Wollongong, NSW, Australia 2 The University of New South Wales, Sydney, NSW, Australia 1. Concrete Finish: Concrete finish floors shall have a [ hard steel troweled finish; light broom finish ] unless indicated otherwise on the drawings. Elevated Concrete Floor Slabs: How to Be on the Level. The floor flatness for an elevated concrete slab decreases with time due to initial deflection caused by the slab’s dead weight and long-term deflection due to creep and shrinkage of the concrete. The last two methods was carried out in the present work. For the Rebound Hammer test results, the concrete strength average is 214 kscas shown in Table 2 that means the slab concrete strength is rather common for the building construction. 6mm, the deflection value the obtained from ANSYS analysis is 3. They may be supported on two opposite sides only [Fig. Excel® file +.