Abstract
This paper presents a finite element-based numerical model for tracing the behavior of ultra-high performance concrete (UHPC) beams. The model developed in ABAQUS can account for stress–strain response of UHPC and reinforcing bar in both tension and compression, bond between concrete and reinforcing steel, and strain hardening effects in bars and UHPC and can trace the detailed response of UHPC beams in the entire range of loading. This model is validated by comparing predicted response parameters including load-strain, load-deflection, and crack propagation against experimental data governed from tests on UHPC beams with different reinforcement ratios, fiber volume fractions, and loading configurations (shear and flexural loading). The validated model is applied to quantify the contribution of stirrups and concrete to shear strength of beams so as to explore the feasibility of removing shear reinforcement in UHPC beams.
Highlights
Performance Concrete Beams.Ultra-high performance concrete (UHPC) is a new class of cementitious material possessing excellent mechanical properties [1,2]
This drawback is overcome to certain extent through adding steel fibers to ultrahigh performance concrete (UHPC) mix and this type of concrete is referred to as ultra-high performance fiber-reinforced concrete (UHPFRC)
These authors inferred that the developed model incorporating concrete damage plasticity (CDP) material model can account for strain hardening behavior of UHPFRC in tension and can predict realistic load capacity of UHPFRC member
Summary
Tysmans et al [33] evaluated the behavior of high performance concrete under biaxial tension These authors inferred that the developed model incorporating concrete damage plasticity (CDP) material model can account for strain hardening behavior of UHPFRC in tension and can predict realistic load capacity of UHPFRC member. Majority of previous studies focused on global response of UHPFRC structural members with no attention to local response (such as crack propagation direction, contribution of concrete and stirrups to shear capacity) and strain hardening in UHPFRC under tension was neglected. This study presents details on the development of a numerical model in tracing the comprehensive structural response of UHPC and UHPFRC beams with a focus on material models to be adopted for evaluating realistic response in the entire range of loading till collapse of member. The model is applied to quantify contribution of concrete and steel to shear strength of UHPFRC beams and to study feasibility of removing shear reinforcement in flexural UHPFRC members
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