动力荷载作用下混凝土破裂特征的CT试验研究  

CT experimental study on failure characteristics of concrete under dynamic loading

作　　者：田威[1] 党发宁[2] 陈厚群[2,3] 

机构地区：[1]长安大学建筑工程学院,陕西西安710061 [2]西安理工大学岩土工程研究所,陕西西安710048 [3]中国水利水电科学研究院工程抗震中心,北京100044

出　　处：《地震工程与工程振动》2011年第1期30-34,共5页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金资助项目(51009010);中央高校基本科研业务费专项基金(CHD2010JC114);长安大学基础研究支持计划专项基金资助项目;建设部给水排水重点实验室开放基金资助

摘　　要：汶川地震后,强震作用下的大坝混凝土动态力学性能研究广受关注。本文利用CT技术对动力荷载作用下混凝土细观破裂过程进行实时扫描观测,获得了混凝土试件在动力荷载作用下裂纹的开裂、扩展、贯通的全过程CT图像,并给出了动力压缩、动力拉伸CT试验的初步成果。结果表明:动力压缩荷载条件下混凝土破坏时裂纹起裂点多,裂纹演化速度快,能够解释其动态强度提高的原因;而动力拉伸荷载条件下破裂面较平整,当加载速率较高时,裂纹穿越骨料非常明显。该研究为探索混凝土材料在动力荷载作用下的损伤演化规律提供新的研究途径。After the Wenchuan Earthquake,the dynamic behavior of concrete dams subjected to strong earthquake is widely paid attention to.The real time scanning observation of meso fracture in concrete under dynamic load is carried out by means of CT technology,so the CT image of crack propagation,coalescence and failure is obtained in the whole process under dynamic compression and the preliminary dynamic compression and tension results of concrete by CT are given.Based on all these analyses,when the concrete is to be failure,the crack points are increased and the crack evolution velocity is high.It is one of the reasons to make concrete dynamic strengths increase.Meanwhile,when the loading rate is higher,the crack will cut through the aggregate obviouly and the failure plane is relatively smooth under dynamic tension.It will put forward some new ideas to the study of dynamic behavior and damage law of concrete material under dynamic loading.

关 键 词：水工材料 动力破损 CT试验 损伤演化 

分 类 号：P315.973[天文地球—地震学]