关于加气混凝土断裂过程区的研究  

Fracture process zone of autoclaved aerated concrete

作　　者：马锠臣[1] 冯乃谦[2] 

机构地区：[1]东北农业大学水利与建筑学院,黑龙江哈尔滨150030 [2]清华大学土木与水利学院,北京100084

出　　处：《混凝土》2008年第11期4-6,15,共4页Concrete

摘　　要：在对加气混凝土三点弯曲加载梁试件不同初始裂纹相对长度情况下,载荷-裂纹口张开位移-初始裂纹尖端张开位移-初始裂纹尖端韧带沿直线方向若干测点张开位移全曲线进行了系统研究。结果表明:在全曲线下降段沿初始裂纹及其韧带直线方向张开位移呈线性分布;平均裂纹张开角与裂纹口张开位移呈线性关系,且该关系不决定于初始裂纹相对长度;在载荷水平一定时,初始裂纹相对长度较小时,平均裂纹张开角较小,断裂过程区长度较大。The complete curves of load-the opening displacements at several points along initial crack and its ligament are determined by using three point bend beams of autoclaved aerated concrete with different initial relative crack lengths.The results show that there exists a linear distribution of crack opening displacements along initial crack and its ligament under the descending part of load--the opening displacement complete curves,and at the same time the average crack opening angle and the crack mouth opening displacement have a linear relation ,which is independent of initial relative lengths.While load level （P/Pmax） is constant,the length of fracture process zone is bigger if the initial crack relative length is smaller.

关 键 词：加气混凝土 平均裂纹张开角 裂纹口张开位移 初始裂纹相对长度 断裂过程区 

分 类 号：TU528.2[建筑科学—建筑技术科学]