基于能量耗散法的混凝土动态抗压损伤特性研究  

Study on Dynamic Compressive Damage Properties of Concrete Based on Energy Dissipation Method

作　　者：罗曦[1] 刘博文[1] 王孝政[1] 

机构地区：[1]三峡大学土木与建筑学院,443002

出　　处：《灾害与防治工程》2015年第1期62-67,共6页Disaster and Control Engineering

摘　　要：通过对混凝土试件在10^-5、10^-4以及10^-3种应变速率下进行了单轴动态抗压试验，并对实验数据加以拟合。从能量法的角度，根据Najar损伤理论并对该理论加以改进。用改进后的方法对拟合后的数据加以分析和计算，重新定义了一种新的损伤本构，并基于Weibull—Lognormal的应力一应变本构关系给出了损伤变量和应变之间的损伤本构。根据改进的方法得出了混凝土单轴受压状态下损伤变量随应变的变化规律，得出了不同应变速率下的D￡曲线并分析了其损伤特性。改进后的方法在符合物理意义的同时绕开了原方法繁杂的积分运算，为混凝土的损伤分析提供了一条新思路。Abstract The uniaxial dynamic compressive test of the concrete specimen is carried out under the strain rates of 10^-5, 10^-4 and 10^-3, and the experimental data is fitted and im- proved based on the energy dissipation method , according to the Najar Damage Theory. A modified method is used to analyze and calculate the fitting data, trying to redefine a new damage variable. Analysis of the damage properties of concrete under the uniaxial dynamic compression is carried out. Finally, based on the Weibull Lognormal stress-strain constitu- tive relationship, a new damage constitutive is proposed. The improved method is in ac- cordance with the physical law and avoids the complex integral operation, which provides a new way for the damage analysis of concrete.

关 键 词：混凝土 动态受压 损伤特性 

分 类 号：TU755.7[建筑科学—建筑技术科学]