基于细观数值模拟的混凝土断裂过程区特性研究  

Calculation the properties of fracture process zone on meso-scale in concrete

作　　者：卿龙邦[1] 姜军[1] 周明杰[1] 王娟[2] 吴礼华 

机构地区：[1]河北工业大学土木工程学院,天津300401 [2]郑州大学水利与环境学院,河南郑州450001 [3]中国建筑科学研究院,北京100013

出　　处：《混凝土》2016年第4期9-12,共4页Concrete

基　　金：高等学校博士学科点专项科研基金(20134101120007;20131317120012);国家自然科学基金资助项目(51309073;51309203);清华大学水沙科学与水利水电工程国家重点实验室开放基金(sklhse-2014-C-02);河北省自然科学基金资助项目(E2014202257)

摘　　要：基于细观数值模拟方法研究了混凝土裂缝尖端断裂过程区特性。采用多尺度方法对不同尺寸的三点弯曲梁试件进行建模,并利用非局部损伤模型模拟了断裂过程区的演变过程。结合现有试验对数值计算方法进行了验证。研究表明:基于数值模拟方法得到的荷载—裂缝口张开位移曲线与试验结果吻合较好。峰值荷载时刻对应的临界断裂过程区长度随着试件高度的增加而逐渐增加,临界损伤区域面积亦相应增加,临界断裂过程区长度与试件高度的比值随试件高度的增加趋于稳定。Based on the method of meso - scale numerical simulation, the properties of concrete fracture process zone before the crack tip was studied.The multiple scales method was used to model the three point bending beam with different sizes and the non - local damage model was used to simulate the evolution of the fracture process zone. The effectiveness of this method was verified by comparing with the existing test.The results show that the load - crack mouth opening displacement curves obtained by the numerical calcula- tion method fits well with that from experiment method. At the moment of peak load, the critical fracture process zone length and the critical damage region increases along with the increase of the specimen height and the ratio of the fracture process zone length and the specimen height tends to be stable along with the increase of the specimen height.

关 键 词：混凝土 细观数值模拟 断裂过程区 多尺度 非局部损伤 

分 类 号：TU528.01[建筑科学—建筑技术科学]