Here the ratio of longer span of slab to the shorter span of slab is less or equals to 2. Answer (1 of 12): Hi, The Dead and Live loads acting on the slab may vary for Floor slab and Roof slab. Answer (1 of 7): Three types of load are considered while designing slab: 1. From the slabs, the loads are transferred to the beam. Conclusion. This video discusses about how the load is distributed from slabs to the beams. 5. One way slabs bend in one direction only and transfer their loads to the two support beams in opposite directions. 1- Claddings will work well ,distributing the load acurately mainly when load is distributed on cladding whole area. Where. Some of the formulas can be obtained from Reynolds and Steedman (2005) for transfer of load from two-way slab to beams. b is the radius of relative stiffness. 2- same as cladding if you set it with no FE and trapezoidal load distribution method. u is Poisson's ratio which is set to 0.15 in this module. Like in the attached figure a floor load of 10kN in the -GY direction is applied . . FIrst, find number of rods required for main reinforcement and distribution. One of the accepted methods of calculating the "effective slab width," which is used by Hambro, actually appears in Section 317 of the British Standard Code of Practice CP114 and is reproduced in Fig. x 18 in., edge beam dimensions = 14 in. Volume of steel is 1% of concrete. For IS 456:2000, the factor of safety is 1.5. Haque, P.E. Standard depths of rib are 6, 8, 10, 12, 14, 16, or 20. Example: One-Way System. Variation in successive spans 33% ( . carrying the load 2. 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. Where; n = load from slab. Since the girders are not directly supporting the slab, the system is considered one-way. Dead Lo. Example: One-Way System. Evaluate the length of the distribution bar. One-way shear or beam shear at distance d from the column Two-way or punch out shear which occurs along a truncated cone. Simply supported slabs are classified as One way slabs and Two way slabs. 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. b is the radius of relative stiffness. Two-Way Concrete Floor Slab with Beams Design and Detailing. f ck = 25 . 56. Solved Example. 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. u is Poisson's ratio which is set to 0.15 in this module. Step 1- Calculation of Numbers of Bars. Floor finish load Dead Load: Self weight of the slab= Mass / Weight of the slab i.e. 3. This load travels from the floor slab to the beams that support it. As we know that density of Reinforced concrete is 25 KN/m3. Physical distance - the distance between a start point (origin) and end point (user computer) is a main factor, because of the limitation of the speed of light which is the maximum speed your packets can travel between these two points. One-way slab (ly/lx > 2) Long span: p = nl x /2. = 0.15*24= 3.6 KN/m 2. However main reinforcement bar and distribution bar in transverse direction. The width of the slab strip to be used in the calculation is provided by AASHTO (Section 3.24.3.2) as follows (see Figure 6): As we know that density of Reinforced concrete is 25 KN/m3. Limitations: 1. After checking punching shear, I would distribute the load . One way type load distribution can only be applied through the FLOOR LOAD option. Here, we will be going to use the height data for identifying the best distribution.So the first task is to plot the distribution using a histogram to . LL 2 DL 4. One Way Slab Bar Bending Schedule Calculation. As an example, consider a room with a floor area of 10 feet by 11 feet . Moment values would be comparatively higher along shorter direction ( stiffer ). d is the slab thickness, inches. In this module the distance is calculated as 1.5 * "Radius of Relative Stiffness" given by the following equation: b = [ Ec d3 / (12 * (1-u2) * ks)] 0.25. Factor of Safety. One way spanning slabs. If the axle load is at support, we should calculate the distribution factor for shear assuming the deck is simply supported by the stringers. In two-way slab, the live load moments due to a concentrated or locally distributed load may be worked out by "Pigeaud's Method" but when the deck slab is not made monolithic with the cross beam i.e. SLAB LOAD CALCULATION Self weight of slab = 7 x 1.5 x.12 (Depth of slab = .12) = 1.26 x25 ( unit weight of concrete = 25) = 31.5 = 31.5/7 = 4.5 kN/m DEAD LOAD = 4.5 kN/m LIVE LOAD CALCULATION = 7 X 1.5 = 10.5 = 10.5 X 2 = 21 kN/m2 ( live load = 2) = 21/7 = 3 kN/m LIVE LOAD = 3 kN . Now convert kilo per metre into kilo Newton so load applied by Steel in slab is approx 0.10kN. This video explains how the slab load transfer to beams with tributary area of two way slab and one way slab with an example. Spreadsheets can solve complex problems, create charts and graphs, and generate useful reports. In this example, the pressure load from the slab is transferred directly to the beams. The results obtained from the method are usually very conservative. A st as distribution bars in longer direction of slab. Load capacity of simply supported concrete slabs. Dataset Information 1.2 Plotting Histogram. 55. Elements that participate in carrying the load need to be properly detailed for seismic requirements 3. Dead load of brick wall: Weight = volume density, Dead load = 0.38 m 3 2200 kg/m 3, Dead load = 836 kg/m It will be converted into kilo Newton by dividing with 100 we will get 8.36 kN/m So dead load of a brick wall is about 8.36 kN/m acting on column. 3. Where. Look for a stamp on the joist that indicates the lumber's species and grade. 11.10a and 11.10b Assume a thickness h for the slab; calculate the self-weight The area load is thus calculated as: w = q t w = 1.2 3 / 2 = 1.8 k i p / f t. A one-way system will divide up the area formed by the two . 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 . 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. Once the loads are obtained, the component takes the load first i.e the slabs can be designed. Number of Distribution Bars = Lx / spacing + 1 = 3000/150 + 1 = 21 nos. Number of Required Bars Formula = (Length of slab / spacing) + 1. Determination of Two way slab . Thereafter, the vertical loads are calculated namely the dead load and live load. This sounds complicated, but the next few graphs and example problem makes 5. slab is an important part of the dead load of the structure. Can design only a portion to carry shear load, but need to ca detail rest of structure 5. A cantilever slab 200 mm thick is 1.715m long, and it is supporting a blockwork load at 1.0m from the fixed end. 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 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 . The sections through a simply supported slab and a continuous slab are shown in figure below. Step 1. Density *Area. One of the accepted methods of calculating the "effective slab width," which is used by Hambro, actually appears in Section 317 of the British Standard Code of Practice CP114 and is reproduced in Fig. Table 1: Approximate moments and shears for non-prestressed continuous beams and one-way slabs Their main steel in on shorter span length. 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. The same coefficients are presented in Figure-3 to Figure-6. Use a design value table to find the Fb value for your floor joists. A concentrated load of 90,000 lbs in one square inch, or even a square foot, is much different than a distributed 90,000 lb load over 1000 square feet. Total weight = 312.5 kg+10kg. 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 . Most shear walls will have openings 4. therefore be = 59 in. The normal live load distribution factor (as in Table 3.6) shall be applied to the rest Upon reaching the beam, the load travels to the end of a beam, which is connected to a girder. Now total self weight of slab is equal to weight of concrete and weight of Steel. However this is not the only criteria of a slab to be categorized as one way slab. 2. Uniformly loaded two way slabs deform into a dish or saucer-like shape, so bending moments develop in both directions. Distribution Bar. Now, assume Finishing load to be 1 kN per meter and superimposed live load to be 2 kN per meter. 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. 1.1(b) shows two center strips of a rectangular plate with spans l a and l b. Since the girders are not directly supporting the slab, the system is considered one-way. This can only be reduced by moving content closer to the user. For moment and for determining the distribution steel, put the load in the center of the span. With Wisdom We Explore Design of One-Way Slab www.uthm.edu.my The effect of the skew will be neglected in this analysis. Number of Main Bars = Ly / spacing + 1 = (4000/150) + 1 = 27 nos. d is the slab thickness, inches. x 20 in., and unfactored live load = 100 psf. In above figure (b) represents one way slab. x 27 in., interior beam dimensions = 14 in. 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 definition of column and middle strips, the longitudinal and transverse moment distribution coefficients, and many other the area So, we can calculate slab load to be around 6 to 7 kN per square meter. Note that the amount of lateral distribution increases as the load moves closer to mid span, and reaches a maximum of 0.3L to each side; the . 2. 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 Column offset 10% in each direction. 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. The slab supported on four sided with a ratio of longer to shorter span greater than 2 are also called as one way slab. when a gap is maintained between the deck slab and . 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, For two hour fire rating, 1 concrete cover and 4.5 thick slab is required. In this article, we are going to review load transfer from slab to beams using the three approaches; 1.1: Load transfer in (a) One-way slab, (b) Two-way Slab (Nilson) Fig. 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 Two-Way Concrete Floor Slab with Beams Design and Detailing . Weight of steel = .010.125m38000kg/m3. Transcribed image text: Load distribution and beam analysis (one-way slab) The following figure shows a floor plan of a steel building. Design the slab using the data given below; Purpose of building - Residential. It wouldn't be too hard to calculate the distribution by hand calculations. Let us assume the following, Type of occupancy of the building = Office Building T. 500 kg/m2 is typical for office, storage space and similar. The formulas are presented below; Two-way slab (ly/lx < 2) Long span: p = nlx/2 (1 - 1/3k2) Short span: p = nlx/3. The best way to design a good structure is to . This girder is supporting the accumulated loads from the floor slab and beams and transmits the load to a connecting column. Numerical input variables may have a highly skewed or non-standard distribution. Also read: Difference between Tie Beam and Plinth Beam. Ec is the concrete elastic modulus, psi. For slabs on beams, for one panel. Total Dead load on Slab= 3.6+0.85= 4.45 KN/m 2. Punching Checks - Check the vertical reaction, whether it is zero or not.. 4. Step 2 - Calculation of Cutting Length. A one-way slab simply cuts the slab into two along its length forming a rectangle as shown in Grids B-C/1-2 and A-B/2-3 of Figure 3.1 below.
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