骨料粒径对混凝土动态拉伸强度及尺寸效应影响分析

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Abstract Aggregate size is an important factor affecting the mechanical properties and fracture mechanism of concrete.From the microscopic point of view, concrete was considered as a three-phase composite material composed of aggregate particles, mortar matrix and interfacial transition zone.Considering the strain rate effect of meso-components, a meso-mechanical analysis model for the study of dynamic tensile failure behaviors of concrete was established.The dynamic tensile failure behavior of concrete with different aggregate size was simulated and the size effect on the dynamic tensile strength was revealed.The results are as follows: at low strain rate, aggregate does not be destroyed, and aggregate size has a significant effect on the dynamic tensile failure mode and tensile strength of concrete.The size effect on the tensile strength weakens with the decrease of aggregate size.Cracks will penetrate aggregate at high strain rate, so that the effect of aggregate size on the dynamic tensile strength and size effect of concrete can be neglected.Finally, combining with the influence mechanism of strain rate effect, a theoretical formula for the “static and dynamic unified” size effect of concrete tensile strength was established, which can well describe the quantitative relationship between the concrete dynamic tensile strength and specimen size under different aggregate size.

Key words： concrete size effect aggregate size dynamic tensile meso-scale simulation

Received: 09 October 2018 Published: 28 April 2020

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	JIN Liu
	YANG Wangxian
	YU Wenxuan
	DU Xiuli

Cite this article:

JIN Liu,YANG Wangxian,YU Wenxuan, et al. Influence of aggrecate size on the dynamic tensile strength and size effect of concrete[J]. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(9): 24-34.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2020/V39/I9/24

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