Research on Constitutive Model of Low鄄temperature Concrete Subjected to Impact Load

被引：0

作者：

Ning, Jianguo ^{[1
]}

Li, Yuhui ^{[1
]}

Yang, Shuai ^{[1
]}

Xu, Xiangzhao ^{[1
]}

机构：

[1] State Key Laboratory of Explosion Science and Safety Protection, Beijing Institute of Technology, Beijing

来源：

Binggong Xuebao/Acta Armamentarii | 2024年 / 45卷 / 12期

关键词：

concrete; constitutive model; damage; low temperature service; moisture content;

D O I：

10.12382/bgxb.2023.1090

中图分类号：

学科分类号：

摘要：

The mechanical properties of concrete in a cold environment are different from those in normal temperature state. The impact loading test of concrete is made to study the dynamic mechanical properties of concrete under low temperature environment. In consideration of the influence of temperature and strain rate, the impact damage law of lowtemperature concrete is analyzed by introducing the temperature effect based on damage theory of thermal activation energy. The moduli of all components of low temperature concrete are associated with each other to obtain the equivalent modulus of concrete by using the principle of mixing law, the spherical model of twophase material and the strain rate effect. Damage evolution function is introduced into DruckerPrager yield criterion, which is established with temperature and strain rate as parameters, and a dynamic constitutive model of low temperature service concrete is proposed. The results show that the size of concrete fragments increases significantly and the damage situation decreases with the decrease in service temperature, which shows that the free water condenses into ice in concrete pore cracks at low temperature, and ice has a certain bonding effect on pore cracks. With the decrease in temperature, this bonding effect is strengthened, thus inhibiting the development of; damage during impact loading. With the decrease in service temperature, the content and modulus of ice in pores increase, and the strength of concrete is significantly enhanced. © 2024 China Ordnance Industry Corporation. All rights reserved.

引用

页码：4339 / 4349

页数：10