Title:
Seismic Response of Interior Slab-Column Connections With Shear Capitals
Author(s):
Eric H. Wey and Ahmad J. Durrani
Publication:
Structural Journal
Volume:
89
Issue:
6
Appears on pages(s):
682-691
Keywords:
cyclic loads; flat concrete slabs; flexural strength; punching shear; reinforced concrete; shear strength; Structural Research
DOI:
10.14359/4140
Date:
11/1/1992
Abstract:
In the design of flat-slab buildings subjected to seismic loads, providing adequate punching shear strength for the slab is often a problem. Sufficient punching shear strength can be obtained by increasing the thickness of the slab around the column. Four interior slab-column connection subassemblies were tested under earthquake-type loads. In three of the subassemblies, the region of the slabdimensions of each shear capital were different while the depth was kept the same. The effect of the size of the shear capital on the strength, stiffness, and failure mechanism of the slab-column connection was studied. Both punching shear failures and bending failures were observed. The current ACI 318-89 recognizes that there are two possible locations of the critical section of a slab, which vary in depth. Based on the test results, the critical section of a slab with shear capitals subjected to seismic loads may be at a location not recognized by the code. A shear capital must have a sufficient length with respect to the depth of the slab and be appropriately reinforced to effectively increase the shear capacity of the connection.