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Primarily slabs are classified into two types One-way Slab and Two-way slab to know more about the differences refer here. Hope this helps. Tension caused by shear and torsion: C CT T Shear Tension carried by stirrups Flexure‐shear cracks. or coffered slab, essentially consisting of a thin top slab . 0. Two-way slab reinforcement details. acting compositely with a closely spaced orthogonal grid of . On the other hand, when […] Article by Civil Engineering Home - The Constructor. Use the Equivalent Frame Method (EFM) and compare the results with spSlab model results. – Reinforcement Calculation . 500 reinforcement. Reinforcement Details In One Way Slab. 3.5K Shares . 0. The figure above shows the detailing of reinforcement in simply supported double-span two-way slab with dimensions Ly/Lx = 4/4 = 1. Quick Tip; Calculators; Basics; Estimation; Contact Us; Like 48 Thanks! FIGURE 1-2 (iv) At the strength limit state, the failure of a slab is pre-ceded by the mobilization of all reinforcement running across the hinge lines that develop over the entire width of the span, or around the columns. A ribbed slab also called as waffle slab is a two-way joist . Author Engineering Discoveries . 1.2: Grid model of two-way slab (Nilson) 2 Analysis of Two-way Slabs by Coefficient Method The determination of exact moments in two-way slabs with various support conditions is mathematically formidable and not suited to design practice. How to Design a two-way slab - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. cranked at 1m from centre of support. Check development length at support. In two way slab the corners may be held down by restraints or may be allowed to lift up. The slabs are considered as spanning two-way when the longer to shorter span length is less than a ratio of two. When detailing a two way slab, one should remember three things 1. 2. 18. Two Way Slab. 0. Fig. Two way Slab reinforcement details:-As per below fig, it is clear that Ly/Lx = 5/5 =1 < 2. 0. Difference Between One Way Slab & Two way slab. Buildinghow Team integrates all Earthquake Resistant Building Technologies. 3. On the other hand, when […] Article by Civil Engineering Home - The Constructor. Two-Way Slab Reinforcement Details: In the two-way slab, as the loads are held up in both directions i.e. 0. Two way slabs are such slabs in which the loads are shared by both the shorter and longer direction of the slab. Method 2 gives a better rep- resentation of internal forces in a slab panel than Method I. Method 2 (yield-lines) may be successfully used for uniformly loaded slab panels with different boundary conditions. Quantity of Reinforcement (Steel) required for Slab Or Bar Bending Schedule for Slab. Two-Way-Concrete-Floor-Slab-with-Beams-Design-Detailing.pdf In this kind of slab, the main reinforcement bars are placed in both directions. Since this is a two way slab, bending is going to occur in both directions. Two way slab bend or deflect in both directions. 7. One way Slab is a slab in which one side is very large compared to the other one. There is minimum steel criterion for rebar in negative and positive moment region. You can also read:-10 Types of footings or foundations which we adopt in Construction 16 Different types of slabs in construction Different types of Columns in construction. Two-way reinforced concrete flat slabs are an efficient, economical and widely used structural system. Modern 2 Storey House Design With 3 Bedroom. Slab may be supported on walls or beams or columns. 0. 1. In two-way slabs, the load will be carried in both directions, thus main reinforcement is provided in both directions for two-way slabs. 0. If the first slab is a two-way slab, both the behavior and the reinforcement rules are proportionate. Waffle Slab (two-way joist system) suitable span 7.5m to 12m with LL= 4-7.5KN/m2. 20. Various simplified methods are therefore adopted for determining moments, shears and reactions in such slabs. 16mm dia with 2 No. For reasons regarding behaviour, safety and economical design, the two-way slab is far more efficient than the equivalent one-way slab. 1. Slab supported directly by columns are called flat slab. ... ( at centre and support), and show the reinforcement details in a simply supported rectangular beam of size 300 mm x 500 mm, clear span 5m supported on walls of 0.3m, use a suitable scale Reinforcements: Main: 4 No. Sources of tension (ctd): 3. Primarily slabs are classified into two types One-way Slab and Two-way slab to know more about the differences refer here. Check the applicable joist dimensional limitations as follows: 1) Width of ribs shall be at least 4 in. Depending upon the support condition, the slab may be simply supported, continuous, or cantilever slab. ¾Ensure steel details are practicaland that steel can be fixed and concrete can be satisfactorily placed and compacted around ... Cantilever beam or slab Simple beam or slab Impact and rebound loading. Slab supported directly by columns are called flat slab. 6.2K views; Total. Design the slab. Design of Slab (Examples and Tutorials) by Sharifah Maszura Syed Mohsin Example 1: Simply supported One way slab SLAB THICKNESS Minimum thickness for fire resistance = 80 mm Estimated thickness considering … Comparison of One-way and Two-way slab behavior Economic Choices One-way Slab on beams suitable span 3 to 6m with LL= 3-5KN/m2. Design of a two way slabs for punching shear resistance. Which is smaller than 2 hence we adopted two-way slab. c. Slab shear strength – two-way shear Check the adequacy of slab thickness for punching shear (two-way shear) at an interior column (Figure 4): Tributary area for two-way shear is 16 5.75 2 (18 14) ( ) 248.7 12 A Tributary u ft2 V q 0.193 248.7 48.0uu u u A Tributary kips do O In this post, I am finding out the Estimation of Steel reinforcement required for a Slab to work on this I considered a plan as shown below. You've already liked this. 0. Fig. The behavior and the reinforcement of a one-way slab connected to a cantilever are described below. ultimate strength (fc’= 4000 psi) is used for all members, respectively. longer and shorter direction. 0. With respect to serviceability, codes permit thinner slab thicknesses when computed deflections are within prescribed limits. design moments for top and bottom reinforcement in a panel of slab. Building codes and analysis methodologies have evolved to address both slab strength and serviceability requirements. The loads held up by two sides in this kind of slab are equal. By the way additionally there are two types of slab. Categories Civil Engineering Articles, Reinforced Concrete Tags design of two way slab, design one way slab, how to classify one way and … The reinforcement rules are also similar in both directions. Reinforcement detailing of a slab is done based on its support conditions. For continuous slabs, hogging reinforcements are provided at top over supports and bottom bars are curtailed. Hence, two way slab is adopted where cranked bars (main bars) are provided on both sides of the slab. Deflected shape of two way slab is dish-shaped. but also according to shape slab may be divided into rectangular, square, trapezoidal, circular, or maybe triangular. Curtail or bent surplus bars. Slab supported on two sides and bending takes place predominantly in one direction only is called One Way Slab. The bending of these slabs takes the shape of a dish-like form when loaded uniformly. Unformatted text preview: Chapter 2 – Design of Two-way Slabs Part 3 Step 4: Select Slab Reinforcement Table 5.10 Area of reinforcing steel As (mm2) per meter strip 1000/spacing = 2.5 per meter meaning 5 bars per 2 m.Step 4: Select Slab Reinforcement Step 4: Select Slab Reinforcement Step 4: Select Slab Reinforcement Step 4: Select Slab Reinforcement Step 4: Select Slab Reinforcement for … In this post, we are going to explain how to calculate steel quantity for the slab? 0. in details the spacing of the bars at the column strips can bars near the support unless otherwise indicated or shown those along the longer span at center and over the longer span 2. for two - way slab along the longer span shall be placed below 1. all reinforcement shall be 0.019 clear minimum from top concrete slab and bottom of slab. Up next . reinforcement in the slab, 3) apply drop panels at columns, or 4) use two-way joist slab system. that for reinforcement in nonprestressed floors. Everything You didn't Learn in College. 1-2, illustrates pos-sible alternatives of two-way … Mesh Reinforcement in Two way Slab. How to Calculate Steel Quantity for Slab? in most cases, the slab is rectangular in shape. Assume diameter of bar = 12 mm. 0. Details Design of Slab; Different types of slab. 1.9K Shares . Sources of tension (ctd): 4. Concrete slabs are commonly divided into the following types: • Beamless slabs Beamless slabs are supported only on columns and are applied mostly in large industrial and … 104. For both one way and two way slab with an example. Happy Learning 🙂 0. The steel fixer’s formwork drawing of a two-way slab. Slab may be supported on walls or beams or columns. Recommendations Use Method 2 or Method 3 generally. The slab is outside buildings which subjected to 1 hr fire resistance and design for 50 years design life. Reinforcement detailing of a slab is done based on its support conditions. Slab thickness of 7 in. L d ≤ 1.3M l / V u + l d. Provide min. 34. Two-way slabs are slabs that are supported on four sides. Slab with reinforcement in both directions is more reasonable and supportive than one-way reinforcement slabs. Step 5: Detailing of reinforcement. 4: Deflected shape of one way slab is cylindrical. In this example, the latter option will be used to achieve better understanding for the design of two-way joist slab often called two-way ribbed slab or waffle slab. 5: one way slab has structural strength in shortest direction: Two way slab has structural strength in the shortest direction: 6: Main reinforcement is provided in only one direction for one way slabs. In two way slab main reinforcement is provided along both direction. Slabs could be simply supported, continuous or cantilever. A st as distribution bars in longer direction of slab. is adequate for one-way shear. For a simply supported two-way slab a mesh reinforcement is provided to resist bending in both directions. Detailing of Torsional Reinforcement at Corners . • Slab supported directly by columns are called flat slab • One Way Slab • Two Way Slab 19. 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 0.08L from the center support. Two-way concrete slabs with openings the static system and the design of reinforcement. Additional torsion reinforcement is required at corners when it is restrained against uplifting as shown in Fig.1. Slab supported on two sides and bending takes place predominantly in one direction only is called One Way Slab. Contains all design checks required by the american concrete institute code and all the conditions that must be met during the design process L/B>2 is one way slab L/B<2 is two way slab; One way slab is supported by two parallel beams or walls; Two way slab is supported by four sides; Main reinforcement will be provided on one side; Main reinforcement will be provided on both sides (sometimes). Advantages Carries heavy loads Attractive exposed ceilings Fast Disadvantages Formwork with panels is expensive . And reinforcement with Fy = 60,000 psi is used. Quantity of Reinforcement (Steel) required for Slab Or Bar Bending Schedule for Slab:-In this post, I am finding out the Estimation of Steel reinforcement required for a Slab to work on this I considered a plan as shown below. Figure 1 – Two-Way Slab with Beams Spanning between all Supports Reinforcement Details of Simply Supported Beam and Slab. 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