Can design only a portion to carry shear load, but need to ca detail rest of structure 5. In this example, the pressure load from the slab is transferred directly to the beams. First, determine the size, the spacing and span, and the species and lumber grade of your floor joists. In the end, after calculating the entire load on a column, please do not forget to add in the factor of safety. One Way Slab Bar Bending Schedule Calculation. 1.133 Kg of steel is required per sq ft of 6-inch thick RCC slab. What Is Tributary Area?The tributary area is defined as the area of floor or roof (in plan) that causes loading on a particular structural element.What is the meaning of tributary area?The tributary area is a loaded area that contributes to the load on the. Two way slabs bend in both directions, and transfer their loads and stresses . This can only be reduced by moving content closer to the user. Now, assume Finishing load to be 1 kN per meter and superimposed live load to be 2 kN per meter. Volume of steel is 1% of concrete. Number of Distribution Bars = Lx / spacing + 1 = 3000/150 + 1 = 21 nos. member supporting that area, ex. Calculate the Value of 'D' (Depth of slab- Top cover- Bottom cover) Find out the No. structural load calculation, calculate load on beam, load beams, design calculation, concrete slab load capacity calculator, calculate the weight of i beam, beam design calculation, i beam load capacity calculator, beam load calculator, column, wall staircase Live load of the slab 3. There are two types of shear that need to be addressed Two-Way Slabs without beams One-way shear or beam shear at distance d from the column Two-way or punch out shear which occurs along a truncated cone. Many machine learning algorithms prefer or perform better when numerical input variables have a standard probability distribution. Example: One-Way System. Enter the email address you signed up with and we'll email you a reset link. The same coefficients are presented in Figure-3 to Figure-6. . Two way slabs has more steel content as compared to the one way slabs. Since the bounding polygon is a rectangle, we can easily calculate its area by multiplying the side lengths, and hence we have derived the tributary area of column D-1: 8m x 4m = 32m2. With Wisdom We Explore Design of One-Way Slab www.uthm.edu.my 5. A slab supported on four adjacent beams with a ratio of longer span to shorter span less than two that carry the load by flexure in both perpendicular directions refers to a two way slab. Design Sections- absolutely the price of the shear.. With the higher than calculations, it's . the area This procedure is called "Level Rule" Level Rule should only be applied to the axle load at the support. Conclusion: This is how we can easily calculate and use the quantity of steel as per their types of . Dead Load: Self weight of the slab = Mass / Weight of the slab i.e. carrying the load 2. Weight of steel = .010.125m38000kg/m3. Elements that participate in carrying the load need to be properly detailed for seismic requirements 3. 2. Determination of Two way slab . Two way slab design? Since the girders are not directly supporting the slab, the system is considered one-way. 3. I believe the discrepancy is that Westergaard assumed a thick bridge slab, where load may disperse through the slab thickness, and AU does not assume a slab thickness. dimensions, live load, superimposed dead load, f~, fy Carry out the geometry check for use of direct design method; observe the limitation of the direct design method listed in Section 11.3.1 Obtain the minimum slab thickness for deflection requirements using Eqs. ; However be< 8.9(tc/h) in feet 8.9(2.5/4.5)(12) = 59 in. of Bars. Their main steel in on shorter span length. 55. One-way slab (ly/lx > 2) Long span: p . Answer (1 of 12): Hi, The Dead and Live loads acting on the slab may vary for Floor slab and Roof slab. Some assumptions has to be made to understand the calculations of Dead and Live loads acting on the slab. This girder is supporting the accumulated loads from the floor slab and beams and transmits the load to a connecting column. lx = length of short side pf the slab. x 18 in., edge beam dimensions = 14 in. Dr. M.E. Floor finish load Dead Load: Self weight of the slab= Mass / Weight of the slab i.e. Since load is distributed in only one direction, . Distribution Bar. Self weight of beams per running meter. The results obtained from the method are usually very conservative. Furthermore, how do you calculate water load on a slab? Moment values would be comparatively higher along shorter direction ( stiffer ). Variation in successive spans 33% ( . L/B 2. Load of walls per running meter. One-way shear or beam shear at distance d from the column Two-way or punch out shear which occurs along a truncated cone. Two way slabs are such slabs in which the loads are shared by both the shorter and longer direction of the slab. This load travels from the floor slab to the beams that support it. Like in the attached figure a floor load of 10kN in the -GY direction is applied . Step 1- Calculation of Numbers of Bars. . The minimum thickness can be determined by many factors: Shear strength of beamless slabs (usually a controlling factor); slab must be thick enough to provide adequate shear strength Flexural moment requirement (less often a governing factor) Fire resistance requirements Check vertical shear : Put the load one slab depth away from the beam; x=h . Solution: Self-weight of the slab= slab thickness* concrete unit weight. Thereafter, the vertical loads are calculated namely the dead load and live load. 1- Claddings will work well ,distributing the load acurately mainly when load is distributed on cladding whole area. x 20 in., and unfactored live load = 100 psf. Step 4 - Extra Top Bar. The load distribution in a one way slab is towards the supports, and is of rectangular pattern. Numerical input variables may have a highly skewed or non-standard distribution. If no gap between the deck slab and the cross beams is maintained, the slab panel becomes a two-way slab continuous in both the direction. One way slabs bend in one direction only and transfer their loads to the two support beams in opposite directions. There is Westergaard's formula from 1930: 2* (load width) + 0.58L, which is comparable to the code above: load width + 0.6L, if you assume the load is at midspan. Ec is the concrete elastic modulus, psi. As per Thumb rule for Steel required for RCC slab is 80 kg/m3, then quantity of steel required for 1 sq ft (0.0118 cubic meter) RCC slab is equal to = 80 0.01416 = 1.133 Kg. The best way to design a good structure is to . 3. One way type load distribution can only be applied through the FLOOR LOAD option. Total Load of slab (Dead load + Live load + Self weight) The columns are also subjected to bending moments which have to be considered in the final design. 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 slab is cast-insitu reinforced concrete. Limitations: 1. Haque, P.E. Two Way Slab. 2. 6. After checking punching shear, I would distribute the load . When you apply a floor load to a slab pannel, the programme calculates the equivalent load and apply the load to the beams bordering the slab as a uniformly distributed load. Slab thickness of 7 in. 4.0 m 8.0m Loads carried by the slab are as follows: Unfactored dead load from self-weight of precast slabs, self-weight of steel beams and finishing = 5.5 kN/m 2 Unfactored imposed load = 4.3 kN/m Determine the . For moment and for determining the distribution steel, put the load in the center of the span. A cantilever slab 200 mm thick is 1.715m long, and it is supporting a blockwork load at 1.0m from the fixed end. You do not have to calculate the equivalent load manually and apply them to the beams. Determining Load Limits. This video discusses about how the load is distributed from slabs to the beams. Dead load of the slab 2. Haque, P.E. x 27 in., interior beam dimensions = 14 in. Some of the formulas can be obtained from Reynolds and Steedman (2005) for transfer of load from two-way slab to beams. 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 Types Of Loads On Column: Self weight of the column x Number of floors. 2- same as cladding if you set it with no FE and trapezoidal load distribution method. Point Load: A load or weight subjected over a point area is called a point load.However, mathematically a point load doesn't look feasible, simply because any load will need to have a certain area of impact and cannot possibly balance over a point, but if the impact area is too small compared to the length of the beam, may be taken as defined. Dataset Information 1.2 Plotting Histogram. + Load spacing Overlapping influence zones may result in cumulative weak axis bending moments, and traditional engineering mechanics are not appropriate for a two-way slab problem with sinusoidal stress distribution. The first stage of the design is finding the bending moment of the slab panels. 5. Designing of slabs depends upon whether it is a one-way or a two-way slab, the end conditions and the loading. 3. 3. The deflection of a uniformly loaded flat plate, flat slab, or two-way slab supported by beams on column lines can be calculated by an equivalent frame method that cor-responds with the method for moment analysis. FIrst, find number of rods required for main reinforcement and distribution. Column offset 10% in each direction. ly = length of long side of the slab. One-way slabs carrying predominantly uniform load are designed on the assumption that they consist of a series of rectangular beams 1 m wide spanning between supporting beams or walls. If you are modeling the slab as plates and applying the load on the slab as a pressure loading on plates, the load distribution will be in both directions as plates are two way elements. Simply supported slabs are classified as One way slabs and Two way slabs. For uniformly distributed loads of w per square foot of the slab, each strip acts approximately like a simple beam uniformly loaded by its share of w; i.e., w a and w b Step 2 - Calculation of Cutting Length. Number of Required Bars Formula = (Length of slab / spacing) + 1. The basic steps to design a beam is, Assume the section size, grade of steel and concrete according to the structure to be built, Calculate the total UDL, point load and other loads if applicable, Calculate the factored moment, Revise the size and grade of materials if required, Calculate the area of steel required, Density *Area. Slab design is comparatively easy when compared with the design of other elements. Solved Example. Two-Way Concrete Floor Slab with Beams Design and Detailing. For two hour fire rating, 1 concrete cover and 4.5 thick slab is required. From IS 456:2000 clause 26.5.2.1; the distribution reinforcement should be provided 0.12% of b D if high strength deformed bar or . To distribute the load on a two-way slab, simply draw an isosceles triangle in its short direction and a trapezoid in its long direction as shown on the rest of the slab below. Depending on the boundary condition and the properties of the slabs, methods of finding bending moment is expressed in the BS 8110 Part 01 as follows. One way spanning slabs. The load on the slab is carried by the short span in one direction. The normal live load distribution factor (as in Table 3.6) shall be applied to the rest The effect of the skew will be neglected in this analysis. Upon reaching the beam, the load travels to the end of a beam, which is connected to a girder. In above figure (b) represents one way slab. This sounds complicated, but the next few graphs and example problem makes Evaluate the length of the distribution bar. However this is not the only criteria of a slab to be categorized as one way slab. The unfactored live load does not exceed 3 times the unfactored dead load. As we know that density of Reinforced concrete is 25 KN/m3. The deck slab is considered to be a one-way slab system due to its large aspect ratio (panel length divided by the panel width).
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