For the same floor system described in Problem 13-10 and the loading and material strengths given in Problem 13-7, assume the slab thickness has been selected to be 7 in.
(a) For a typical interior floor panel, calculate the immediate deflection due to live load and compare to the limit given in ACI.
(b) For the same floor panel, calculate the total deflection after the attachment of partitions and compare to the limit given in ACI for partitions that are not likely to be damaged by long-term deflections. Assume that 85 percent of the dead load is acting when the partititions are attached to the structure and assume that 25 percent of the live load will be sustained for a period of 1 year.
Problem 13-10
For the floor system shown in Fig. P13-7, assume the slab has four equal spans in the north-south direction and three equal spans in the east-west direction. Assume story heights above and below this floor are 10 ft - 0 in. Use the loading and material strengths given in Problem 13-7 and assume a slab thickness of 7.5 in.
(a) Use an equivalent-frame method to analyze the factored design moments along column line 2 and compare the results with the moments used in part (b) of Problem 13-7.
(b) Use an equivalent-frame method to analyze the factored design moments along column line A and compare the results with the moments used in part (b) of Problem 13-8.
Problem 13-8
Refer to the slab shown in Fig. P13-7 and the loadings and material strengths given in Problem 13-7.
(a) Select slab thickness.
(b) Use the direct-design method to compute moments, and then design the reinforcement for column and middle strips running east and west along column line A.
Problem 13-7
The slab shown in Fig. P13-7 supports a superimposed dead load of 25 psf and a live load of 60 psf. The slab extends 4 in. past the exterior face of the column to support an exterior wall that weighs 400 lb/ft of length of wall. The story-to-story height is 9.5 ft. Use 4500-psi concrete and Grade-60 reinforcement. (a) Select slab thickness.
(b) Use the direct-design method to compute moments, and then design the reinforcement for column and middle strips running north and south along column line 2.
(c) Check two-way shear and moment transfer at columns A2 and B2. Neglect unbalanced moments about column line 2.
