ICASGE'23
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PUNCHING SHEAR STRENGTH OF FLAT SLAB-EDGE COLUMN CONNECTIONS SUBJECTED TO ECCENTRIC LOADING
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Volume Title: ICASGE2023
Authors
1Professor, Structural Engineering Department, Faculty of Engineering, Alexandria University, Egypt
2Teaching assistant, Structural Engineering Department, Faculty of Engineering Alexandria University, Egypt
3Assistant Professor, Structural Engineering Department, Faculty of Engineering Alexandria University, Egypt
Abstract
The behavior of flat slabs subjected to punching stress is a significant topic in design, particularly for edge columns, due to the lack of a reliable theory capable of explaining this phenomenon. This research aims to compare experimental results to theoretical calculations obtained from the different codes (ACI 318-2019, ECP 203-2017, and EC2-2004) for edge column slab connections. The effect of the load eccentricity and changing column dimension parallel to free edge were detected. This study presents the results of half-scale reinforced concrete flat plate edge connections. The experimental program was designed to study punching shear strength and slab-column edge connection behavior. Two groups of test specimens have been considered. The first group was directed to investigate the effect of load eccentricity. While the second group aimed to investigate the effect of changing the column dimension parallel to free edge. Each group included three specimens. The slabs were cast using concrete with a mean compressive strength of 43 MPa, with a constant flexural reinforcement ratio (1.5%), and dimensions (1.6 * 1.0 * 0.1 m). All tested slabs have failed in punching shear mode. Test results indicated that increasing eccentricity reduces the ultimate load of the tested slabs whereas increasing the column dimension parallel to free edge causes the ultimate load and the stiffness of the connection to increase. Also, the three codes are conservative, although the EC2-2004 code is the closest to the experimental records, and the ECP 203-2017 simplified method is unconservative for large eccentricity and should be revised.
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