Experimental research of punching shear mechanism of reinforcing concrete slab

Abstract

The analysis of various regulatory methods for calculating reinforced concrete slabs for pushing and comparing with experiment results is made. The tested sample, measuring equipment and test bench are described. Sizes and materials for experimental prototype were chosen by existing beamless and capless slabs of monolithic reinforced concrete superstructures with column grid from 8×8 to 9×9 m. Experimental research results of reinforcing concrete plate structure are presented for study purpose of stress-strain state when punching shear collapse occurring. Various aspects and observations obtained during the test are given. The comparison of the tested slab fragment with the complete response of slab structure is performed. Analysis of tested sample stress-strain state and punching bearing capacity calculations results in according to existing regular standards were made. Main criterias of punching shear collapse were determined and new procedure for punching calculation of RC concrete slabs was offered basing on significantly new approach in punching bearing capacity defining.

Consideration of External Reinforcement Based on Carbon Fibers for the Redistribution of Bending Moments in Slabs

“…Analyzing previously performed works [1][2][3][4][5][6][7][8], the following types of rigid capitals can be distinguished (it is understood not to strengthen the punching zone with reinforcement, but to introduce elements into the system that significantly increase the rigidity of the support section) In the course of the conducted research, a specific task was set -to solve the issue of punching. At the same time, the issue of the rigidity of this section, with the exception of individual works, has not been fully investigated (a number of authors carried out movement control and concluded that there was a significant increase in the rigidity of the zone at the column).…”

Punching of Concrete Slabs Reinforced by Recycling Waste

“…Moreover, higher reinforcement ratios led to improved punching-shear capabilities, reduced reinforcement strains, and smaller slab deflections . Further research has explored punching tests for bidirectional slabs (Trekin and Pekin., 2019), accompanied by the formulation of accurate punching capacity calculation sequences. A puncture resistance formula, considering the bending reinforcement ratio, demonstrated reasonable agreement with experimental data (Guo and Cheng., 2015).…”

Punching strength of conventional reinforced concrete flat slabs

“…Comparing the calculated punching strength using this equation to test data, a small average error is obtained. Trekin and Pekin [7] presented punching tests for two-way slabs. They also formulated a sequence for calculating the punching capacity which proved to be accurate.…”