温度修正的混凝土动态本构模型研究  

Research on Temperature-modified Dynamic Constitutive Model of Concrete

作　　者：芦天翊 李秀地 李威 LU Tianyi;LI Xiudi;LI Wei(Department of Military Facility,Army Logistical University of PLA,Chongqing 401311,China)

机构地区：[1]解放军陆军勤务学院军事设施系

出　　处：《粉煤灰综合利用》2019年第4期3-7,共5页Fly Ash Comprehensive Utilization

基　　金：国家自然基金（51378496）;国家部委基金（CY213J009）

摘　　要：高温处理后的混凝土通过霍普金森压杆试验,得到不同温度和应变率下的应力-应变曲线。结合损伤演变规律,对ZWT黏弹性本构模型进行温度修正,提出一个新的温度修正的混凝土材料的动态本构模型,并有实测曲线拟合除了温度相关的模型参数表达式。分析结果表明:提出的计算模型曲线与试验实测曲线吻合度较高,所构建模型能够较为合理地描述混凝土受高温作用后的动态力学性质。Based on heating experiment device and Split Hopkinson Pressure bar (SHPB) system, the stress-strain curves at different temperature and impacts speed are obtained. According to the damage evolution of concrete, the ZWT visco-elastic constitutive model is modified by temperature factor. A new temperature-modified dynamic constitutive model of concrete is established and the parameters are fitting. The result shows that the calculated model curve is in good agreement with the actual test curve, and the constructed model can accurately describe the dynamic mechanical properties of concrete after high temperature.

关 键 词：混凝土 高温 分离式霍普金森压杆 本构模型 动态性质 

分 类 号：TU528.34[建筑科学—建筑技术科学]