# Two Way Slab. Problem Statement:

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1 Two Way Slab Problem Statement: Use the ACI 318 Direct Design Method to design an interior bay of a flat plate slab system of multi bay building. The Dimensions of an interior bay are shown in Figure 1. 20' Figure 1. Interior Bay Dimensions This example is to be used for educational purposes only. 1

2 Design Data Column Size - 24 x 24 Materials Concrete: normal weight (150 pcf), f c = 4,000 psi Welded Wire Reinforcement (WWR), fy = 80,000 psi Loads Superimposed dead loads = 30 psf Live load = 50 psf Slab Thickness Longest clear span ln = 24 (24/12) = 22.0 ft Minimum thickness h per ACI Table 9.5(c) = ln/30 = 8.8 in. Use h 9.0 in. q u = 1.2(9/12* ) + 1.6(50) = psf Design for Flexure Check if the Direct Design Method of ACI Sect can be utilized to compute the bending moments due to the gravity loads: 3 continuous spans in one direction, more than 3 in the other O.K. Rectangular panels with long-to-short span ratio = 24/20 = 1.2 < 2 O.K. Successive span lengths in each direction are equal O.K. No offset columns O.K. L/D = 50/( ) = 0.35 < 2 O.K. Since all requirements are satisfied, the Direct Design Method can be used. Short Direction (20 ft) l 2 = 24 ft and l n = 20-2 = 18.0 ft Factored moment per span. Mo = = Division of the total panel moment Mo into negative and positive moments, and then column and middle strip moments, involves the direct application of the moment coefficients in the following Table 1. This example is to be used for educational purposes only. 2

3 Slab Moment Total Moment Column Strip Middle Strip Int. Neg. Int. pos Table 1 Moment Distribution. Reinforcement, Assume D16 wires will be used. d = /2 = 8.03 in. Column strip width b = (20 x 12)/2 = 120 in. Middle strip width b = (24 x 12) 120 = 168 in. As = Mu /4d*60/80 where Mu is in ft-kips and d is in inches Min. As = bh*60/80 (grade 80,000 psi steel) Max. s = 2h = 18 in. or 18 in. (Sect ) The required reinforcements are shown in table 2. Span Location Column Strip Middle Strip Mu kips-ft b (in) d (in) As (in2) Min As (in Reinforcement Int. Neg D16 at 6 in. Int. Pos D8 at 6 in. Int. Neg D8 at 6 in. Int. Pos D8 at 6 in. Table 2. Required Bay Reinforcement. Long Direction (24 ft) l 2 = 20 ft and l n = 24-2= 22.0 ft Factored moment per span. Mo = = Division of the total panel moment Mo into negative and positive moments, and then column and middle strip moments, involves the direct application of the moment coefficients in the following Table 3. Slab Moment Int. Neg Int. Pos. Total moment Column Strip Middle Strip Table 3 Moment Distribution. This example is to be used for educational purposes only. 3

4 Reinforcement, Assume D20 wires will be used. d = /2 = 7.55 in. Column strip width b = (20 x 12)/2 = 120 in. Middle strip width b = (20 x 12) 120 = 120 in. As = Mu /4d*60/80 where Mu is in ft-kips and d is in inches Min. As = bh*60/80 (grade 80 ksi ) Max. s = 2h = 18 in. or 18 in. (Sect ) The required reinforcements are shown in table 4. Span Location Column Strip Middle Strip Mu kips-ft b (in) d (in) As (in2) Min As (in Reinforcement Int. Neg D20 at 6 in. Int. Pos D8 at 6 in. Int. Neg D8 at 6 in. Int. Pos D8 at 6 in. Table 4. Required Bay Reinforcement. Reinforcement Details: The following figures 2, 3, 4 and 5show the reinforcement details for the column and middle strips for both directions. The lengths were determined from Figure of ACI WWR2 WWR3 Top Reinforcement This example is to be used for educational purposes only. 4

5 20' Bottom Reinforcement Figure 2. Top and Bottom Reinforcement 11' 9' 13' 11'-8" WWR2 2 D8 This example is to be used for educational purposes only. 5

6 10' 11' 2- D8 26' WWR3 Figure 3. Sheets Details 11' 11' 5' " 2' 5' " 20' Column Strip This example is to be used for educational purposes only. 6

7 10' 10' WWR3 20' Middle Strip Figure 4. Cross Section (Short Direction) This example is to be used for educational purposes only. 7

8 13' 13' 6' " 2' 6'-71 4 " 26' Column Strip 11'-8" 11'-8" WWR2 26' Middle Strip Figure 5. Cross Section (Long Direction) This example is to be used for educational purposes only. 8

9 Reinforcement Quantities: Sheet WWR2 WWR3 Weight per Foot (lb) Number and Size Length (ft) Weight (lb) 11 D D D D D D D D Total Weight of Sheet Each 20 by 24 bay has one, one WWR2, one WWR3 and two. The total steel weight for each bay = *299.4 = lbs. Steel weight per square foot = / (24*20) = 1.93 lb/ft 2 Design Using Grade 60 Rebar. Figures 6 and 7 show the reinforcement detail of the interior bay using Grade 60 Rebar. The total steel weight for each bay using Grade 60 Rebar = 1,204 lbs. Steel weight per square foot = 1,204/(24*20) = 2.51 lb/ft 2 Conclusions: The ratio between the total weight per square foot using WWR to the total weight per square foot using Grade 60 Rebar = (1.93/2.51) *100 = 77%. Placed of WWR Should be significantly faster than placement of the reinforcing bars, resulting in additional overall saving. This example is to be used for educational purposes only. 9

10 12' " 9' '-9 5 " 8 " 9' " 10 # 4 10 #4 10# 4 20' Column Strip 10' 10' 14# 4 6" 2' " 7 # 4 7 # 4 20' Middle Strip Figure 6. Cross Section (Short Direction), Grade 60 Rebar This example is to be used for educational purposes only. 10

11 15' " 10' '-2 3 " 8 " 10' # 4 " 14 # 4 11# 4 26' Column Strip 11'-8" 11'-8" 10#4 6" 3' " 5#4 5#4 Middle Strip Figure 7. Cross Section (Long Direction), Grade 60 Rebar This example is to be used for educational purposes only. 11

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