摘要
从三级配混凝土的细观层次出发,将梁的纯弯段视为由水泥砂浆,粗骨料及两者间的粘结带所组成的复合材料。采用既考虑应变率强化效应又计及损伤弱化效应的动力本构模型反映细观单元的损伤退化。通过自编的以位移控制的有限元程序对三级配混凝土梁在冲击荷载和三角形循环荷载作用下的破坏机制进行了数值模拟,给出了相应的应力-应变曲线和动弯拉强度。研究结果表明数值模拟所得的结果与实验结果吻合较好。
The pure bending section of three-graded concrete beam is considered as a three-phase composite composed of matrix,aggregate and interface between them on meso-level.Dynamic constitutive model which has considered strain rate hardening effect and damage softening effect is adopted to describe the concrete and meso-element＇s damage.The failure mechanism of beam under impact loading and triangular cyclic loading is simulated by using displacement-controlled FEM,furthermore,stress-strain curve of specimen and its dynamic bending strength are obtained.The results show that the numerical solutions are fitted with experiment results.
出处
《世界地震工程》
CSCD
北大核心
2008年第1期1-5,共5页
World Earthquake Engineering
基金
国家杰出青年科学基金资助项目(50325826)
重大研究计划基金项目资助(90510011)
北京市教育委员会科学技术与研究生建设项目资助(4700001401509)
北京市属市管高校人才强教计划资助项目(05004012200515)
关键词
混凝土梁
冲击荷载
三角形循环荷载
动弯拉强度
数值模拟
concrete beam
impact loading
triangular cyclic loading
dynamic bending strength
numerical simulation
