Evaluation of shear enhancement for high-strength concrete plates

Jiang, Dajiu (1994) Evaluation of shear enhancement for high-strength concrete plates. Masters thesis, Memorial University of Newfoundland.

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Abstract

A research program including material investigation, experimental and analytical investigation on high-strength concrete plates are reported in this thesis. -- Material investigation was carried out on the durability of high-strength concrete tensile properties under cold ocean environment (freeze-thaw cycles). Tensile properties of high-strength concrete in terms of modulus of rupture, direct tensile strength and fracture energy were examined up to 700 freeze-thaw cycles in laboratory simulated environment. -- An experimental investigation on shear enhancement was carried out on seven high-strength concrete slabs to study the punching shear capacity and shear enhancement. Five types of different shear reinforcement, namely single bending, U-stirrup, double bending, shear-stud and T-headed shear reinforcement were tested and evaluated. The emphasis is placed upon the evaluation of their contribution to punching shear capacity of high-strength concrete plates. Structural behaviours were evaluated in terms of overall load-deflection response, ultimate loading capacity, post-ultimate loading capacity, ductility and energy absorption. Failure patterns and strain distribution were also discussed. -- The analytical investigation was conducted by using the finite element analysis. The finite element analysis reported herein is an application of the nonlinear analysis of reinforced concrete structures using three-dimensional solid finite element. The purpose of this application is based on the fact that employing three-dimensional elements is the only successful way to model out-of-plane shear reinforcement in the slabs. Hence, the three-dimensional twenty node brick element with 2x2x2 Gaussian integration rule over the element faces and a plasticity-based concrete model were employed in a finite element program. Single bending and double bending shear reinforcement were modeled with the smeared layer method, while shear-stud and T-headed shear reinforcement were depicted individually in the mesh. Reasonable agreement has been obtained between the numerically predicted behaviour and experimental test results. Transverse shear stress was evaluated by the finite element analysis in terms of punching shear, and compared with the unfactored punching shear resistance specified by the Canadian building design code.

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