Title:
Studies on Concrete Slabs with Stud Reinforcement in the Vicinity of Edge and Corner Columns
Author(s):
Fee Kiong Lim and B. Vijaya Rangan
Publication:
Structural Journal
Volume:
92
Issue:
5
Appears on pages(s):
515-525
Keywords:
columns (supports); connections; failure; flat concrete plates; flat concrete slabs; floors; moments; punching shear; reinforced concrete; shear strength; standards; studs; tests; Structural Research
DOI:
10.14359/902
Date:
11/1/1995
Abstract:
Tests on nine large-scale reinforced concrete slabs of a flat plate floor in the vicinity of edge and corner columns are reported. Test specimens were designated as Slabs 1, 2, 3, 4, 5, 6A, 7, 8, and 9. The purpose of these tests was to study the effectiveness of stud shear reinforcement in increasing punching shear strength of slab-column connection. Test parameters were the column size and ratio of spacing of studs-to-slab thickness. Slabs 1, 2, and 3 had edge column with dimensions 250 x 250 mm (10 x 10 in.). Slabs 4 and 5 and Slabs 6A and 7 had edge column dimensions of 150 x 600 mm (6 x 24 in.) and 150 x 400 mm (6 x 16 in.), respectively. Slabs 8 and 9 had corner columns with dimensions 250 x 250 mm (10 x 10 in.). Slab 1 was a control specimen. All other slabs contained stud shear reinforcement with stud spacing equal to one-half of the slab thickness in Slabs 2, 4, 6A, and 8, and equal to slab thickness in Slabs 3, 5, 7, and 9. Flexural reinforcement and geometry of slabs were the same in Slabs 1 through 7, whereas Slabs 8 and 9 had different reinforcement layout and geometry. A truss theory is developed to explain the punching failure and predict the punching shear strength. The theory shows good correlation with the test results.