Experimental study on shear behavior of high-strength concrete beams without web reinforcement in different failure patterns
To investigate the shear behavior of high-strength concrete beams without web reinforcement in different failure patterns,this study conducted shear behavior tests on nine high-strength concrete beams(with a concrete strength grade of C90)subjected to concentrated loads,while considering the shear-span ratio and the effective depth of section as main parameters.The failure pattern,performance state and corresponding nominal shear strength of the specimens were analyzed.Based on experimental observations and load-bearing characteristics of specimens,it was found that the main failure sign was the appearance of main inclined cracks in the diagonal-tensile specimens,and the crushing of concrete in the compression zone was the main failure sign in the shear-compressive and diagonal-compressive failure specimens.The analysis of nominal shear strength reveals that the joint influence of shear-span ratio and effective depth of section is observed on the nominal shear-splitting strength,while the predominant factor affecting the nominal shear-failure strength is the shear-span ratio.The nominal shear-splitting strength and the nominal shear-failure strength can be determined based on the tensile and compressive strengths of concrete,respectively.The shear capacity evaluation should prioritize shear-splitting as the governing state,based on a comprehensive analysis of both domestic and foreign design standards.Furthermore,it is crucial to thoroughly consider the size effects in order to enhance the accuracy of the assessment.
high-strength concrete beam without web reinforcementshear behaviorshear splitting stateshear failure statenominal shear strength
国家科技期刊平台
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