Title: Reinforced Concrete Slab-Column Edge Connections with Openings

Author(s): Ehab F. El-Salakawy, Maria Anna Polak, and Monir H. Soliman

Publication: Structural Journal

Volume: 96

Issue: 1

Appears on pages(s): 79-87

Keywords: columns; connections; failure; flat concrete plates; openings; punching shear; reinforced concrete; shear strength

DOI: 10.14359/598

Date: 1/1/1999

Abstract:
Test results of six full-scale reinforced concrete flat plate edge connections with an opening in the vicinity of the column are reported. The test specimens represent a portion of a slab bounded by the lines of contraflexure around the column. The tests were designed to study the effect of openings on the punching shear behavior of the slab-column edge connections. The test parameters were the location and the size of the openings. One specimen had no opening and the remaining five had various arrangements of openings around the column. All specimens were cast with normal density concrete of approximately 32 MPa compressive strength. The openings in the specimens were square, with the sides parallel to the sides of the column. Two sizes of openings were used: the same size as the column (250 x 250 mm), and 60 percent of the column size (150 x 150 mm). The design procedures in the American and Canadian Codes (ACI 318M- 95 and CSA A23.3-M94) are discussed and compared with the test results.