DOI: 10.11908/j.issn.0253-374x.21029

作者:

作者单位: 同济大学 土木工程学院，上海 200092


作者简介: 海 鲁（1994—），男，博士生，主要研究方向为混凝土损伤本构模型。 E-mail： tjhailu@tongji.edu.cn


通讯作者: 李 杰（1957—），男，教授，博士生导师，工学博士，主要研究方向为工程可靠性理论，随机力学与混凝土损伤力学。 E-mail： lijie@tongji.edu.cn

中图分类号: TU313


基金项目: 国家自然科学基金（51538010）




A Dynamic Constitutive Damage Model Considering Rate-Dependence of Micro-cracks Evolution for Concrete
Author:

Affiliation: College of Civil Engineering， Tongji University， Shanghai 200092， China


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摘要:在混凝土静力弹塑性损伤理论的基础上，提出有效损伤驱动力的概念，引入微惯性和微黏性以考虑混凝土微细观裂纹动力演化的率敏感性所导致的材料应变率效应，建立了适用于强动力作用下混凝土结构响应分析的动力损伤本构模型。利用数值分析得到的混凝土应力应变全曲线和动力提高因子表明该模型能够反映材料在中、高应变率作用下的动力力学性能。对Hopkinson杆的数值模拟，也表明了所提出模型的有效性。



Abstract:In this paper， a rate-dependent damage model was proposed by incorporating micro-inertia and micro-viscosity into the static elasto-plastic damage framework to account for the strain rate effect of concrete induced by the rate-dependence of micro-cracks. The stress-strain curves and dynamic increase factors of concrete strength obtained by numerical analysis indicate that the dynamic mechanical properties of the material at moderate and high strain rates can be well captured by the model. Furthermore， numerical simulations of a Hopkinson-bar test were performed and the analytical results were in good agreement with the experimental results， demonstrating the validity of the proposed model for the dynamic responses analysis of concrete structures exposed to high-rate loadings.





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