摘要
作为一种重要的工程结构材料,混凝土构件的安全问题成为工程界普遍关心的问题,随着科学与技术的发展,混凝土构件的使用条件越来越苛刻,特别是在高温条件下的断裂行为更是成为人们关注的焦点。基于文献[1]在常温下所作的混凝土紧凑拉伸试件测量应力强度因子的实验结果,利用ANSYS有限元商业软件计算了相同载荷条件下混凝土紧凑拉伸试件的应力应变场,用虚拟裂纹闭合技术(VCCT)计算了试件的应力强度因子,计算结果与实验结果吻合较好,验证了该算法和程序计算混凝土构件应力强度因子的可靠性。在此基础上考虑温度对材料力学性能的影响,计算了同样的结构在外载作用下的应力应变场,并获得了不同温度条件下的应力强度因子。计算结果表明:在相同力载荷加载条件下,随着温度的增加,混凝土结构的柔度增加;在相同位移加载条件下,随着温度的增加,混凝土的应力强度因子逐渐减小。
The security of concrete structures is mainly concerned in structural engineering, especially fracture problems in high temperature. Based on the experimental results of stress intensity factor （ SIF ） for concrete compact-tensile specimens in normal temperature in paper [ 1 ] ,stress and strain fields were simulated under the same loading by FE software ANSYS, and the SIFs were calculated using VCCT. Quantitative comparisons between the numerical and experimental values were made, showing that they were in good agreement. Then, effects of temperature on mechanical properties of the material were considered, and the stress and strain fields of the same specimen under loading were calculated, and the SIFs were obtained in different temperatures. The results show that, with increasing of temperature,the flexibility of the concrete structure increases under the same force-loadlng condition, while SIFs reduce under the same dlsplacement-loading condition.
出处
《四川建筑科学研究》
北大核心
2008年第2期67-70,共4页
Sichuan Building Science
基金
教育部科学技术重点项目(305013)
四川省杰出青年基金项目(06ZQ026-004)
作者简介
刘永杰（1984-），男，四川雅安人，硕士研究生，研究方向：结构工程的有限元数值分析；工程材料的本构关系、损伤、断裂及疲劳。E-mail：liuyongjie_2002@163．com
