Experimental research of punching shear mechanism of reinforcing concrete slab

Nikolay Trekin,Dmitrii Pekin,A Volkov,A Pustovgar,T Sultanov,A Adamtsevich

doi:10.1051/e3sconf/20199704032

Nikolay Trekin, Dmitrii Pekin + Show 4 more

Open Access

https://doi.org/10.1051/e3sconf/20199704032

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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.

Highlights

The study of the mechanism of punching reinforced concrete slab structures on the basis of theoretical studies, field experiments and comparison of the strength calculation results using various techniques implemented in SNiP 2.03.01-84 *, SP 63.13330.2012 and Eurocode 2, has been actively pursued in the last few years [1,2,3,4,5]
They criticize the current provisions of domestic standards in terms of calculating punching in the presence of shear reinforcement, which summarize the bearing concrete capacity at stress state (SSS) stage I and the bearing shear reinforcement capacity at SSS stage III, which obviously does not correspond to the physical nature of the destruction mechanism
The experiment results [3] show that the standard calculation method leads to a significant overestimation of the bearing punching capacity using high-strength concrete class B40, B45;

Summary

Introduction

The study of the mechanism of punching reinforced concrete slab structures on the basis of theoretical studies, field experiments and comparison of the strength calculation results using various techniques implemented in SNiP 2.03.01-84 *, SP 63.13330.2012 and Eurocode 2, has been actively pursued in the last few years [1,2,3,4,5] They criticize the current provisions of domestic standards in terms of calculating punching in the presence of shear reinforcement, which summarize the bearing concrete capacity at SSS stage I and the bearing shear reinforcement capacity at SSS stage III, which obviously does not correspond to the physical nature of the destruction mechanism. The further study of issues related to the punching mechanism implementation and the coverage of new unexplored destruction aspects is an important task, especially when a wide range of specialists are provided with test results of a monolithic reinforced concrete slab for punching with a sufficiently detailed sample description and experiment conducted previously for comparison with the new design of the beamless slab reinforced by a hidden metal capital [6] at the rigid connection

Test bench and loading procedure description

Sample description

Measuring equipment description

Bearing punching capacity determination and analysis of results

Conclusions and the proposed method of calculating punching slabs