Simply supported two way slab design example

Simply supported two way slab design example. Variation in successive spans 33% ( . 9. Check for the deflection. Shear forces and support reaction forces. where ly is length of longer side and ly is length of shorter side. Total Dead load on Slab= 3. Apr 19, 2009 · In Shukala's handbook your slab three sides supported one side free is neatly covered with worked examples. Feb 9, 2024 · Two-way slab: The two-way slab is supported by the beam on all four sides. figure below. Control of deflections. Limitations: 1. 2) In lieu of detailed calculation for deflections, ACI 318 Code gives minimum thickness for two-way slab with beams spanning between supports on all sides in Table 8. More over of this, you will come to know how to do detailing Feb 13, 2021 · In the video, the first six steps are solved for the design example of a simply supported two-way slab. 8 kN/m2. 5m & 6. Nov 15, 2010 · Click Here Link 02. Calculation of ratio of the length of long span to length of short span. The difference between one way slabs and two way slabs can be found in this article link. The equivalent strip method applies to concrete deck slabs that are at least 7 inches thick, have sufficient concrete cover, and have four layers of steel reinforcement, with longitudinal and One-way slabs are those supported on two opposite edges. As for the bending moment we change the load and reaction values to variables. 6 Nodal Forces 20. Direct Design Method "D. Increases the beauty of the room. 4. Here we discuss about the example of two-way slab design. 75 m apart. 11 kN/m ⋅ ( 5 m) 2 / 8 = 0. The slab has to carry a live load of 4 KN per meter square. %PDF-1. Usually for residential purpose M20 is used. The ratio of longer span to shorter span is equal or greater than 2, is considered as one way slab because this slab The two-way flat plate slab is simply a slab of uniform thickness directly supported on columns, and it is generally suitable for relatively light loads. 2010:42-56. One can distribute service load (unfactored load) to the beam or ultimate distributed load to the slab; use factored load for both dead load and live load of the slab according to the specifications of Part Three continues with the study of two-way, post-tensioned slab systems, including a complete design example using the Equivalent Frame concept. Initially approximate depth is calculated for the slab by using d/300 formula. the ratio of the larger to the smaller theoretical span, is greater than 2. When a slab is supported on all four sides and the ratio of long span to short span is equal or greater than two, it will be considered as one way slab. The calculation checks the design of one or two-way spanning reinforced concrete slabs. Basically simply supported slabs are classified into two types. 2 Minimum Concrete Cover According to ACI Code 7. Adopt M-20 concrete & Fe-415 steel. The slabs having ratio of longer length to its shorter length (L y /L x) greater than 2 is called one way slab otherwise as two way slab. 1 INTRODUCTION. Types of simply supported slabs: One way slab Two way slab III. The load on the slab is carried by the short span in one direction. This is useful in achieving thinner slabs, specific in areas which require greater floor to ceiling height. Simply Supported Two Way Slab Design as per IS 456 : i) The Input data for the slab design is : Sep 8, 2020 · #tw0wayslab #simplysupportedslab #cornersarenothelddownin this video, i will explain about design of tw0 way simply supported slab with corners are not held Sep 30, 2022 · An Example of how to Design a 2-way reinforced concrete slab. 🕑 Reading time: 1 minuteReinforced concrete slab design and detailing guidelines for depth of slab, loads on slab, reinforcement guide for one-way and two-way slabs as per IS 456:2000 have been tried to present here. 3-14) Design the slab system shown in Figure 1 for an intermediate floor where the story height = 3. be/kjmPv1d1ohMDesign On the other hand, when slab is supported on all four sides and bending take place in two directions are said to be Two Way Slab. The deflected shape of a rectangular slab, simply supported go its two opposites long edges and free on any support along the two-opposite short edges is shown in Figure-1. Suchcoefficients are provided later in this section. b) Perform all checking on shear, deflection and cracking of the slab. The slab has to carry a distributed permanent action of 1. ----- Apr 6, 2022 · Subject - Theory of Reinforced Concrete StructuresVideo Name - Design of One Way Slab (Simply Supported) Chapter - Design of Slabs using LSMFaculty - Prof. 7. Design the two way slab beam supported floor system if it is intended to be used for office building ,assume the partition wall load to be ⁄ Use C25/30 S400 Cover 25 mm Solution Step 1: Material property C25/30 S400 Step 2: Depth determination Assumption: - Slab is lightly reinforced ( √ The Traditional Design Method, typically referred to as the Equivalent Strip Method, is based on flexure of the deck in the transverse direction. i Design calculation. The following sections outline the solution per DDM, EFM, and spSlab software respectively. There are two types of slabs – one-way slab and two-way slab. Spanning two ways between the support beams or walls. The span ratio 'ly / lx ≤ 2'. Jul 1, 2020 · The present study has made an attempt to study the behaviour of two-way RCC slab of size 1 m × 1 m of thickness 0. 26. For example, a slab may be called (a) One-way simply supported rectangular slab, (b) Two-way simply supported or restrained rectangular slab, (c) Cantilever rectangular slab, (d) Fixed or simply supported circular slab, etc. 23m. The following 34 x 34 ft flat plate is supported by two fixed edges and two simply supported edges as well as a 16 x 16 in column in the middle. Reinforcement is determined to be T10 bars at 200mm centers in the bottom layer and T10 bars at 300mm centers in the top layer to resist bending and shear stresses. Two-Way Slab with Beams Design and Detailing (CAC Design Handbook) The concrete floor slab system shown below is for an intermediate floor to be designed considering superimposed dead load = 1. L/B 2. . In a two-way slab, the load is carried in both directions. 1: Curtailment of tension steel in Reinforced Concrete Design of Two-Way Slab per ACI CodeBlog Post Link: https://www. = 0. Concrete grade and aggregate size (minimum standard 25/30 MPa and 20mm). 5 m simply supported on all the four sides. The slab is supported on monolithically casted beam all-around of width LESSON 26. The analysis is performed on design strips perpendicular to the slab bands (Transverse Bands). If lx/ly = >2 It is one way slab. 6 KN/m 2. 1) Trail depth and effective span Assume approximate depth d =L/26 3500/26 = 134 mm ACI 318 permits the use of Direct Design Method (DDM) and Equivalent Frame Method (EFM) for the gravity load analysis of orthogonal frames and is applicable to flat plates, flat slabs, and slabs with beams. Use M20 Concrete and 415 steel. Office building. Apr 9, 2020 · Design of reinforced concrete slabs using BS code (Complete Solved Example). Cover to the reinforcements 25mm. If the use of flat plate is not adequate, the use of a slab system with slab bands will be investigated. M" Before Discussion Of this Method, we have to study some concepts: 1. Design Example of Reinforced Concrete Two-Way Solid Slabs using BS8110 Code (Part 2) - (Simply Supported Two-way Slab). 3. Design of Flat Slab Type-1: https://youtu. The objective of the paper is to analyze a two way Tutorial 2: Two way simply supported slab. BS8110 Code. 2. Two Way Slab Design Spreadsheets to Eurocode 2. 6. In this slab, a flat ceiling is available because in the middle of the cell there is no beam. British Standards. Jul 10, 2022 · The below specified 7 steps are generally used to design the two way slab. D. 11kN/m is used as q and the reaction force V a equals ql/2. It is closely related to the plastic collapse or limit analysis of steel frames, and is an Upper Bound or Mechanism approach. Design the slab system shown in Figure 1 for an intermediate floor where the story height = 12 ft, column cross- sectional dimensions = 18 in. The use of flat plate system will be checked first. , interior beam dimensions = 14 in. Continuity across a beam is treated as fixed support. The width of supporting wall is 0. Reinforcement Details of Simply Supported Beam and Slab As seen in figure-1 below, for a simply supported beam and slab, 100% reinforcement as per the design is provided as tension reinforcement at the mid span of the beam and slab, and 50% is curtailed at the distance of 0. Beams are placed along the edge of the slab plate, and columns are installed at the edge of the plate to support the slab and beam. It is estimated that a concrete slab lasts for about 30 to 100 years if it is built with good grade of concrete and steel. It uses Strength Design method as per ACI 318 code of American Concrete Institute. 75(100 psf) = 75 psf Cover Requirements (2-hour fire rating, assume carbonate aggregate) IBC 2003 Restrained slabs = 3/4” bottom Unrestrained slabs = 11/2” bottom = 3/4” top TIME SAVING DESIGN AIDS Page 2 of 9 Two-Way Post Sep 1, 2014 · In this view, it is considered to analyze a two way simply supported slab of different thicknesses with central sunk having one sunk depths. The links of other important videos ar Dec 7, 2023 · 4. 3 Two Way slab design 1. The load-take down for a two way slab is different and the slab is designed for bending in both directions. D. Nominal cover to reinforcement and controlling design consideration, fire or durability (standard Feb 7, 2014 · A short tutorial showing how the shear capacity of a simply supported slab is checked using EC2. We apply the ACI moment and shear coefficients to produce design momen Example 3 – Two way Simply Supported slab: Design a Floor slab 7 x 5 m ,clear dimensions supported all four sides by 230 mm thick walls. The structural operation of a one-way slab can be visualized in glossary of the deformed shape away the loaded surface. Variable load 5 kN/mm2. 7 m, column cross-sectional dimensions = 450 mm × 450 mm, edge beam dimensions = 350 mm × 700 mm, interior beam dimensions = 350 mm x 500 mm, and unfactored live load = 4. 5 Work Done by Yield Line Moment 20. LESSON 26. Yield line analysis is an analysis approach for determining the ultimate load capacity of reinforced concrete slabs and was pioneered by K. The slab is rectangular on plan and measures 5 m by 6 m between the centre of the supports. 45 KN/m 2. The lateral loads are independently resisted by shear walls. (تصميم البلاطات الخرسانية باستخدام الكود Jul 1, 2020 · Study how to Design a Two Way Slab for given data with Proper Procedure & Design Aids (Checks). (Shown in Figure 1) In this system, if the ratio of the long side to the short side of the slab plate is two or more, the transfer of h is Jun 30, 2020 · In this video you all will learn how to design 2 way slab as per IS 456-2000, using excel sheet. Jan 31, 2018 · Reinforced Concrete design - Worked Examples to BS8110. 1) Two Way Slab with Beam. Two-Way Slabs 3 4. In a two-way slab, both twisting and bending moments are generated. Longer span (l)/Shorter span (b) ≥ 2. 1: Minimum thickness of one-way solid slabs Element One-way solid slabs Simply supported One end continuous Both ends continuous Cantilever l/20 l/24 l/28 l/10 where l is the span length in the direction of bending. 2. S-6 one-way slab plan. To design the one-way slab, we assume the 1-meter strip. 1 INTRODUCTION Oct 13, 2019 · In this video, we check the adequacy of a one way slab for shear resistance, and explain some theory behind the CSA simplified method. assume corners are held down. [Ref 20, pp 536-540]. Calculation of area of steel. LL 2 DL 4. The height of the room is more available in this slab. However main reinforcement bar and distribution bar in transverse direction. Further information on Tekla Tedds can be found here. , and unfactored live load = 100 psf. Three or more spans in each direction. For demonstration purpose, consider the one-way slab of the previous example. 8 Rectangular Slab Simply Supported at Three Edges and Free at the Other 20. 5 m. Comment on your answer and give appropriate suggestions. x 18 in. It has to carry a characteristic live load of 10 KN/m^2 in addition to t The design of Two way rectangular slabs supported on all four sides without provision for Torsion at corners is carried out as per Table 27, Indian Standard (IS) 456 App. Reinforced Concrete Design of Simply Supported One-Way Solid Slab to BS8110https://specsfinder. For slabs with a point load, the yield lines will be projecting out of the point of application. It specifies the slab thickness as 125mm and calculates the design loads. Steel Construction 20. 1 m at failure, simply supported on three sides and fourth side being free, under Dec 30, 2022 · M l / 2 = 0. Problem Description. and floor finishes 1 KN per meter square. 7 Analysis of Two-way Slabs ' 20. Two-way slabs are supported on four sides while one-way slabs are supported on two opposite sides. ONE WAY SLAB One way slab is a type of slab to carry the load along one 2]. How to design a simply supported slab. The line load 0. 3m. 23mX0. Example (1):calculate the design moment of one way solid slab that has a total depth of h=180 mm and is reinforced with 16 mm diameter bar spaced s =150 mm, used fc =21 MPa , fy = 420 MPa. 08L from the center support. d=h−concrte cover (20) − ∅/2 = 180−20 −16 Example 15: Design of Concrete Slab. 5kN/m 2. engineeringexamples. We work through a long-form example of treating a slab as a unit-widt Here its clearly explained detailed design of two way slab simply supported corners free to lift, the design is according to limit state design of IS 456-200 Nov 30, 2020 · For one-way slabs supported on two opposite sides, the bending moments are calculated in the same way as for beams. 4 Answers to SAQs 20. Check for deflection is as per the provsions in Cl. It is a very common type of RC slab design (EN1992) Tekla Tedds 2021 - 2018. 5m, and it carries the live load of 4kN/m 2, floor load is 1. Check for the depth. This example will demonstrate the analysis and design of the rectangular simply supported reinforced concrete beam shown below using ACI 318-14 provisions. At the supports, the yield lines are negative in addition to the mid positive yield lines for one way continuous slabs. In this article I will design the simply supported one way slab which is having clear span of 3. 10. Behavior of One-way Slab. The system is called a two-way slab with beams. The bar cutoff points apply to two-way slab systems subjected to the effects from gravity loads only; for systems that are part of the lateral force resisting system, an analysis must be performed Two-Way Concrete Floor Slab with Beams Design and Detailing (CSA A23. This is an example on how to design a one way simply supported solid slab as per the Eurocode 2. w The slab is reinforced at left and right supports, and in span in such a way that the capacities of the respective sections are m1, m3 and m2. May 20, 2020 · Advantages of Two Way Slab: There are the following advantages such as; Do not obstruct the reflection of light. Happy Learning In this video, we explore how to design a simply-supported reinforced concrete slabs. Fig. Factored load = 170 psf (including self-weight) Example 2. Sep 12, 2021 · This calculator is useful for design of one way solid slab simply supported on both ends. Part Three is an example-intensive course, with key concepts introduced along the way. Use concrete nominal cover equal to 30 mm. This three sides supported and one side free slabs are dealt in Dr Krishnaraju's book on 'limit state design of reinforced concrete, and Dr Unnikrishna pillai and Dr Devadasa Menon's book and many other books. Nonetheless, the coefficient method is not included Straight yield line occure between two intersecting planes. Bending moment calculation. two-way slabs without interior column-line beams; included in this figure are the structural integrity requirements in ACI 318-14, Section 8. It is seen that one way slab supported on two opposite sides has only one plane of bending and thus the main reinforcements are provided in one direction (i. The fck = 32 N/mm 2 and fyk = 500 N/mm 2 (yield stress of reinforcement). We will calculate the S-6 slab, which is a one-way slab, and the usage will be the passage. W. 0 (such as slab s3 in the same figure), it is considered as one-way slab in the principal direction while taking into account the secondary stresses in rest edges. V x = q ⋅ l / 2 – q ⋅ x. 00, is considered to be two-way. Two-way flat plates can be used for span up to 8m using reinforced concrete and up to 11m with the post-tensioned system. a) If the slab thickness is taken as 150 mm, calculate and design the main reinforcement for the slab. 1 Design example of a simply-supported two-way spanning solid slab. Slab design Example 02 Design of simply supported slab (Two way spanning) Span of slab 4. Though t Solution: Self-weight of the slab= slab thickness* concrete unit weight. 75 w DL = 0. net/computing-minimum-required-two-way-slab-thickness- CHAPTER EIGHT DESIGN OF ONE-WAY SLABS 4 Table 8. The coefficient method may be the simplest, easiest and the quickest approach for the design of two-way slab supported by edge beam on all slab sides. 34 kNm. The load from the slab in such a case is transferred to two supports. In one way slab main reinforcement is parallel to shorter direction and the Jan 1, 2019 · Optimal design of rectangular, simply supported edges, orthotropic reinforced concrete two-way slabs. Fck 25 N/mm2 fyk 500 N/mm2. 23m dimensions. The floor finishes, ceilings and services have been taken as 1. 9 Circular Slabs 20. 3 Summary 20. Slabs are plate elements forming floors and roofs in buildings which normally carry uniformly distributed loads. 0 kN/m2 (excluding slab self-weight) and a variable action of 3. Steady spanning slabs have a lower size in comparison go simply supported slabs. May 14, 2021 · The design information that should be provided in the detailing of reinforced concrete slabs include: Layout and section drawings including details of holes and upstands, etc. x 27 in. 3. ACI 318-14 (8. Calculation of the loads. 2 Moment coefficient for calcula tion of maximum Design a reinforced concrete slab 6. Column offset 10% in each direction. 1 Introduction. which means in our design calculation the breadth, b will be equal to 1000 mm. The results of hand calculations are then compared with the reference results and Mar 14, 2018 · 14 March 2018 Off By The Engineering Community. This method was provided in the American Concrete Institute (ACI) in 1963 to design two-way slabs carried by steel beams, deep beam, or walls. f. Part Three also covers related topics such as punching shear for two-way slabs and moment transfer at the column. 1. Formula for maximum shear force in simply supported beam q l / 2. +5. Let ∆ be the plastic deflection at x-distance from left hand support to positive yL External work per m strip 2 1 2 ( ) 2 w L Version: Sep-25-2019. Slabs can be categorized into two main types: one-way slabs and two-way slabs. 6+0. One-way slabs are supported by two opposite sides and bending occurs in one direction only. It carries a live load of 4 kN/m 2 and floor finish of 1. Feb 4, 2018 · DESIGN EXAMPLES 1. Also its deflection is managed by checking its span/depth ra Nov 30, 2019 · spans would be (n-1). M Jan 1, 2007 · greater than the elastic deflection and it can be calculated by multiplying the above mentioned. A reinforcement sketch for the simply supported two-way slab is also Design of Slab (Examples and Tutorials) by Sharifah Maszura Syed Mohsin Example 1: Simply supported One way slab A rectangular reinforced concrete slab is simply-supported on two masonry walls 250 mm thick and 3. One-way slab is the most basic and common type of slab. A slab supported on all four edges with an aspect ratio of longer to shorter theoretical span less than ≤2. The document provides details on the design of a one-way spanning slab according to BS 8110-1:1997. Slab: The slab provides a horizontal surface and is usually supported by columns, beams or walls. Johansen in the 1940s. 1. Design of Two-way Slabs. The Iraqi Journal For Mechanical And Material Engineering. If a one-way slab is supported on more than two edges and its aspect ratio, i. 8. Dec 28, 2021 · So the slab is considered as two way slab which supported with beams of 0. In detailing, if a slab is assumed to be simply supported at an end support, it is advisable to provide reinforcement for a probable negative bending moment due to the May 3, 2021 · A simply supported slab is a type of reinforced concrete slab which is commonly used in construction which is supported on primary beams or a supporting walls. Feb 13, 2021 · In the video, the remaining steps are solved for the design example of a simply supported two-way slab. In one way slabs, the positive yield line occur at the mide span. Static analysis of two-way slabs, subjected to uniform load, is performed using tables, which give the fundamental support moments, span moments and shear forces. Design a solid slab, spanning in two directions and simply-supported along each edge on brickwork walls as shown in Figure 4. Two-way spanning slabs For rectangular slabs with standard edge conditions and subject to uniformly distributed loads, normally the bending moments are obtained using tabulated coefficients. I hope this article on “Two way slab design” remains helpful for you. 15*24= 3. 8. May 5, 2020 · This lecture is a part of Concrete Engineering subject for the third year Civil Engineering students at James Cook University, Townsville Australia. Trial depth and effective span in complete slab design The trial depth and effective depth is the second step in the slab design as per IS code provisions. In addition to self-weight, the slab carries a Mar 28, 2021 · A continuous spanning slab is designed to undertake plant loading on the first floor . e. deflection ratio to elastic deflection. If lx/ly < 2It is one two slab. For slabs on beams, for one panel. Design a simply supported one –way slab over a clear span of 3. 4 Analysis of One-way Slabs 20. Following are the RCC Slab Design and Detailing guidelines: Reinforced Concrete Slab Design Guidelines a) Effective span of slab: Effective […] Sep 21, 2020 · #tw0waysimplysupportedslab#tw0wayslab#simplysupportedslab#cornersareheld downin this video, i will explain about design of tw0 way simply supported slab with Mar 28, 2021 · This product will cover a one way steady spanning slab design example, checking on one reinforcement details. Determination of Two way slab The slab is supported all around walls of width 300 mm. Beam-to-slab flexural stiffness (relative stiffness) ratio (α. Two way slab design. Design of reinforced slab for a room of clear dimension 4m*6m. , edge beam dimensions = 14 in. For example, a slab may be called (a) One-way simply supported rectangular slab, (b) Two-way simply supported or restrained rectangular slab, (c) Cantilever rectangular slab, (d) Fixed or simply supported circular slab, etc One-way slab means it bends only in one direction and, therefore, reinforcement Apr 25, 2021 · An example of the design of a one way slab can be found in the link below. Example of two-way slab: Let’s take an example of two-way slab design; Q. 2) Now, assume the depth of the slab so that, it satisfies deflection control criteria. The width of supporting wall is 230 mm. Steps of the structural analysis, flexural design, shear design, and deflection checks will be presented. Therefore, slabs may have different names depending upon its bending, support conditions and shapes. 85= 4. Effective depth is measured from the top edge to the centroid of tension rebar. The loads will transfer from S-6 to beams B-7, 8, and 5. How to design continuous spanning slab. 8 kN/m2 The location of bent points should be checked for flexural, shear, and development length requirements. M20, Fe415 7m 5 m Two-Way Concrete Floor Slab with Beams Design and Detailing Design the slab system shown in Figure 1 for an intermediate floor where the story height = 12 ft, column cross-sectional dimensions = 18 in. The office loading has been taken as 7. Mar 13, 2022 · In this video, we explore how to design a continuous one-way reinforced concrete slab. 1, the following minimum 60%-80% of DL(selfweight) for slabs (good approximation for hand calculation) For this example: 0. 5. In these tables, each slab is Dec 30, 2021 · The complete design of two way slab is explained in my previous post please click here to read. The two-way slab is bent in both spanning side directions while load transfer. x 20 in. 0 kN/m 2. Slab thickness 200 mm. Slabs may be simply supported or continuous over one or more supports and are classified according to the method of support as follows: Spanning one way between beams or walls. 3 ×4. 23. Two way slabs are supported on all 4 sides (beams or walls), which allows for a stiffer floor plate. Two-Way Concrete Floor Slab with Beams Design and Detailing. This calculator assumes normal weight concrete and uses FPS/US Customary Units. 5 kN/m 2. This example will examine two-way floors with slab bands systems. Calculation of effective depth. Assume M20 concrete, Fe415 steel. , parallel to the plane of bending). the slab carries í µí°º í µí°¾ = 10 KN/m 2 including self-weight and í µí± í µí°¾ = 5 KN/m Jun 12, 2020 · All the design procedure are explained under the topic design of two-way slab. Sketch the detail of reinforcement. 2 of the code. Slab is subjected to LL = 4kN/m2, Floor Finish = 1kN/m2. 4 %âãÏÓ 3 0 obj /Type /Page /Parent 2 0 R /Resources /ProcSet [/PDF /Text ] /Font /F1 6 0 R /F2 9 0 R >> >> /MediaBox [0 0 792 612] /Contents 4 0 R Jan 19, 2019 · This is an example on how to design a one way simply supported solid slab as per the Eurocode 2. 6 kN/m2, and unfactored live load = 4. This video demonstrates the Tekla Tedds RC slab design calculation to the Eurocode. 1) At first check weather the slab is one way or two way slab by ly and lx ratio. The concrete grade of the slab is C32/40. er jf vt pz ue zt me hj ru nk