Design Considerations: One Way Slab 1. The factored shear force can be calculated by using the given formula: Vu = w (r⁴/(1+r⁴))* lx /2 where, lx is length of shorter span. A slab supports and transmit load, to supports primarily by flexural, shear and torsion, to wall, beam or directly to column. Effective Depth (d) For deflection control L/d = 20 X M.F M.F. Step 9. Despite both being main reinforcement, reinforcement along shorter span should be kept in bottom layer. The factored bending moment can be calculated by using the coefficient of bending moment from table 26 of IS 456:2000. Assuming suitable bearings (not less than 10cm), find the span of the slab between the centers of bearings. In this article, I am going to explain to you the design of one way slab step by span. I am a Degree Holder in Civil Engineering. Calculate the effective span of slab from IS 456 clause 22.2 which is least of following valuesCenter to center of supports or clear span + width of supportClear span + effective depth of slabStep 4. Slab is a common structural element consisting of a flat, horizontal surface with depth much smaller than width and span. Step 10. Although slab is not casted in 1 m strip, it gives satisfactory design result on using 1 m strip. Step 1. Like this post? Step 7. Step 2. ——- IS: 456-2000, P.46, Ld = (Ø.σs / 4 τ bd )—————–σs = 0.87 fy          As per IS 456-200, P.42, 50 % of steel is bent up near support. The two way and one way slab design are mainly focused. The maximum bending moment per unit width is given by, Where, αx and αy are bending moment coefficient. Step 2. The spacing should not be greater than 300mm. Concrete Slab Design Procedure. Determine the area and spacing of main reinforcement in both direction. so, read it carefully to get full knowledge about it. Center to center of supports or clear span + width of support. Only half of the torsional reinforcement required at the corner of adjacent discontinuous edge should be provided at corner of only one discontinuous edge. House Construction Cost Calculator Excel Sheet For Ground Floor(G.F.), G.F.+1, G.F.+2, G.F.+3, IS 516:1959 Most Important Point (Method of Tests For Strength of Concrete). Aspect ratio is the ratio of effective longer span to shorter span. Your email address will not be published. Required fields are marked *. One way slab is the slab that is supported on two parallel sides carrying loads by flexural in the direction perpendicular to the support. As it is already discussed in preliminary design of slab, CLICK HERE to reach there. I am a Degree Holder in Civil Engineering. Difference Between 33, 43 and 53 Grade Cement, Difference Between Carpet Area and Built-up Area, Difference Between CPM and PERT/PERT Vs CPM, Difference Between Fat Lime and Hydraulic Lime, Difference Between Flexible Pavement and Rigid Pavement, Difference Between Footing and Foundation, Difference Between Lap Length and Development Length, Difference Between One Way Slab and Two Way Slab, Difference Between Plasticizer And Superplasticizer in Civil. Such calculations Design a cantilever projecting out from a room slab extending 1.0m and to be used as balcony (LL = 300 kg/m2). The thickness of steel reinforced slab typically between 100 and 500 mm thick. Check the adequacy of depth from deflection control criteria. A brick wall of 250 mm thickness including plaster of 1.0m height is provided at the end of cantilever fc’ = 17.25 MPa, fy = 300 MPa, Slab thickness of room = 125 mm. It helps to distribute superimposed load properly and also helps in distributing secondary stresses due to temperature change, moisture variation, shrinkage, and so on.Since most of the load is carried on shorter span, main reinforcement is only to be designed for only one direction (shorter span). Your email address will not be published. The possibility of partial restraint must be considered, even if no restraint, at the time of detailing. Spacing should not exceed smaller these two values. Each layer should have area per unit width equal to 75% of mid-span tension reinforcement for adjacent edge of a slab is discontinuous. It is not necessary to check for shear in two-way slab. Steps cut from quartzite sandstone that can be used to build stone staircases. What is Chain Surveying (Principal, Procedure, Method, Instrument), What Is Scaffolding | Types of Scaffolding, What Is Dry Pack Mortar | Advantages of Dry Pack Mortar | Disadvantages of Dry Pack Mortar, Difference Between Whole Circle Bearing and Quadrantal Bearing | What Is WCB | What Is QB, What Is Injection Grouting | Types of Injection Grouting | Different Types of Grouting Materials, What Is Hempcrete | Hempcrete Blocks | Advantages & Disadvantages of Hempcrete Blocks | Applications of Hempcrete, What Is Hard Hat | Hard Hat Colour Definition | Different Hard Hat Colour Codes | Types of Safety Helmets | Classification of Hard Hats, 23 Different Types Cements Available in India and As Per IS Standards, What Is Cover in Concrete | Clear Cover in Beams, Slab, Column, Footing, How to Load Calculation on Column, Beam, Wall & Slab, Density of Cement Sand and Aggregate | Cement Density | Sand Density | Aggregate Density | list of Density, Difference Between Formwork, Shuttering, Centering, Staging & Scaffolding, M.F is Obtained from IS:456-200 P-38 Fig 4, Floor Finishing load = (as floor finishing near 1 kn/sq.mm). The slab supported on four sided with a ratio of longer to shorter span greater than 2 are also called as one way slab.Since load is distributed in only one direction, reinforcement is also needed in only one direction which is called main reinforcement. Step 5. You overcome suffering, it is your wealth; suffering overcomes you, it is your humiliation, Your email address will not be published. And there is almost zero bending moment at the support so there is no need of top layer reinforcement. After designing all, all reinforcement drawing should be drawn. Step 1. DESIGN AND ANALYSIS PROCEDURE- DIRECT DESIGN METHOD Operational Steps Figure 11.9 gives a logic flowchart for the following operational steps. We help brands optimize their online presence & performance. Continuous slabThe precise determination of the theoretical bending moments involve mathematical labor. All rights reserved. Step 7. At CivilJungle, we clarify civil engineering and publish all the happenings & news of civil engineering. The frequent use of slab is found as floor and roof in building, decks in bridges, top and bottom of tanks, road pavement and so on. Design Procedure :- Case I:- Corners are not prevented from lifting. You can find him on Facebook, Twitter, Tumblr, Instagram and Google News. If ratio of longer span to shorter span is less than 2, then it is two-way slab, otherwise one-way slab. Required fields are marked *. It consists of two layer; top and bottom layer and reinforcement in each layer is parallel to the span of slab. Design the slab following the provisions of … Determine the minimum thickness of slab from serviceability criteria of deflection control. 2.The span ratio ly/lx is less then or equal to 2 . Calculate the factored design moment Mu and factored design shear force Vu. Share it with your friends! At the discontinuous corner, torsional reinforcement should be provided. Your email address will not be published. Therefore find M.R for 50 % of steel only, L0 = Sum of anchorage beyond the centre of support, Also, read: What is Chain Surveying (Principal, Procedure, Method, Instrument), Corners not held down conditions is given as per IS: 456-2000 P-90 CI D-2. The distribution reinforcement should be provided 0.12% of bD which is minimum. Mu = Mu,lim = 0.36 fck b xu [d – 0.42 xu]. One Way Slab Design Example: A reinforced concrete slab is built integrally with its supports and consists of equal span of 15 ft. And the minimum area of main steel reinforcement is equal to 0.12% of bD. Modifiction factor from— IS: 456, p.38.Fig-4 Assume % steel 0.3 to 0.6% Fs = … The basic difference are as follows: For the calculation of bending moment, the coefficient in table 27 of IS 456:2000 should be used. The thickness initially obtained is through different assumption and after calculating area of reinforcement provided, it is easier to calculate exact modification value. Determine the minimum thickness of slab from serviceability criteria of deflection control. The reason for designing only for flexural member is that the shear stress are not critical and reinforcement provided for flexural is enough to resist. Determine the total factored load due to live and dead load considering 1m wide strip.Dead load is calculated from IS 875 part 1 and it mainly includes self-weight, floor finish and partition load whereas live load is calculated from IS 875 part 2. (IS 456:2000 clause 23.2.1). The Man Behind CivilJungle. Check for shearFor one-way slab, it would not be a bad practice to check for shear.From IS 456:2000 clause 40.2,The design shear strength Ⴀuv shall be less than equal to shear strength of concrete kႠuc. Required fields are marked *. The two way slab design is also designed as explained in IS codes. Check the thickness of slab.The thickness of slab is calculated for given value of factored moment then check with initial value. Calculate the effective span of slab from IS 456 clause 22.2 which is least of following values. Step 5. Assume the thickness of slab (take 4 cm per metre run of the span). Check for development lengthFrom IS 456:2000 clause 26.2.1The development length is given byLd = 0.87 fy Փ / 4ႠbdStep 10. The thickness calculated from factored design moment should be less than initial value if not, revise with greater depth. Determine the minimum thickness of slab from serviceability criteria of deflection control.As it is already discussed in preliminary design of slab, CLICK HERE to reach there. Two way slabs are those slab which are supported on unyielding supports on all four sides and the ratio of longer span to shorter span is less than 2. Determine whether the slab geometry and loading allow the use of the direct design method as listed in DDM.

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