摘要
为了实现再生混凝土试件强度性能的仿真计算分析,在细观层次上将试件看成是由天然粗骨料、新硬化水泥砂浆、老硬化水泥砂浆、天然粗骨料与老硬化水泥砂浆的老粘结带以及老硬化水泥砂浆与新硬化水泥砂浆的新粘结带形成的五相非均质复合材料,以随机骨料模型代表再生混凝土的细观结构,应用非线性有限元法模拟试件的细观损伤断裂,从而求得其宏观力学强度和破坏过程,据此可解释试件的破坏机理.计算结果表明,试件的单轴抗压强度与试验结果较为吻合,试件的破坏机理符合一般规律,该方法为再生混凝土试件强度性能的数值模拟提供了一种新的技术途径.
In order to realize a numerical simulation of strength characteristics for Recycled Aggregate Concrete(RAC)specimens,the specimens are taken as a non-uniform composite with five phases of natural coarse aggregate,new hardening cement mortar,old hardening cement mortar,old bond layer between natural coarse aggregate and old hardening cement mortar,and new bond layer between new hardening cement mortar and old hardening cement mortar,in meso-level.The meso-level structures of RAC are represented with random aggregate model.The meso-mechanical damage fractures of specimens are simulated and the macro level strengths of specimens are obtained by means of nonlinear finite element method using double line damage model.Then the fracture mechanisms of specimens are explained.The results of calculation show that the uniaxial compression strength of specimens are approximately coincident with the experiment results,and the fracture mechanism of specimens is agree with the common rule.This method provides a kind of new technique of numerical simulation for the strength characteristics of RAC specimens.
出处
《固体力学学报》
CAS
CSCD
北大核心
2013年第S1期58-62,共5页
Chinese Journal of Solid Mechanics
基金
国家自然科学基金项目(11172015)资助
关键词
细观损伤断裂
再生混凝土
随机骨料模型
非线性有限元
强度
破坏机理
meso-mechanical damage fracture
rolled compacted concrete(RAC)
random aggregate model
nonlinear finite element
strength
fracture mechanism
