<span>强震作用下含孔隙度混凝土受压破裂程度分析</span>-华南地震

文章信息/Info

Title:: Analysis of Compressive Fracture Degree of Concrete with Porosity under Strong Earthquake

Keywords:: Strong earthquake; Porosity; Concrete; Degree of compression fracture; Cumulative effect; Longitudinal compression fracture

摘要:: 近年来强烈地震造成的混凝土受压破裂越来越受学者的关注，大部分学者采用受压破裂模型，分析强震作用下的混凝土受压破裂程度，但是在研究过程中学者很少考虑混凝土内在含孔隙度和受压破裂累计效应对受压破裂程度的影响，分析结果与实际相差较大。基于此在受压破裂模型中，引入受压破裂累计效应，通过累计受压破裂值表示含孔隙度混凝土刚度和强度的退化规律，根据含孔隙度混凝土的横向和纵向受压破裂模型，研究含孔隙度混凝土受压破裂程度。经过实验分析发现，该方法在地震震级为5.5级且含孔隙度混凝土孔隙度为9.26%时，含孔隙度混凝土的抗压强度最大为138.65MPa，此时的含孔隙度混凝土受压破裂程度最低，该方法分析结果平均误差为0.003，分析结果与实际结果相似度高。

Abstract:: In recent years，a strong earthquake concrete compression fracture caused by more and more attention by scholars，most scholars use compression fracture degree of concrete compression fracture model analysis under earthquake action，but in the process of research scholars rarely consider the concrete internal porosity and compressive fracture cumulative effect on the degree of compression fracture，analysis results and the actual difference is bigger. Based on this，the accumulative effect of compression fracture is introduced into the compression fracture model，and the degradation rule of the stiffness and strength of concrete with porosity is expressed through the accumulative compression fracture value. The degree of compression fracture of concrete with porosity is studied according to the transverse and longitudinal compression fracture models of concrete with porosity. After experimental analysis，it is found that when the porosity of concrete porosity is 9.26% under M5.5earthquake，the maximum compressive strength of porosity-containing concrete is 138.65MPa and the porosity-containing concrete has the lowest compressive fracture degree. The analysis results are highly similar to the actual results with the average error 0.003.