摘要
大跨度混凝土桥底板普遍纵向开裂,以断裂力学理论为基础,以临界断裂能为判据,以ABAQUS有限元软件为工具,对某预应力混凝土连续刚构桥进行模拟,采用扩展有限元法分析其初始裂缝的扩展过程,并探讨影响裂缝扩展因素,结果显示合理布置底板纵向预应力可以有效控制底板纵向裂缝扩展。
Longitudinal cracks are often observed at the bottom of large span concrete bridge deck.Based on the fracture mechanics,this study adopted the critical cracking energy as the crack growth criteria and simulated concrete cracking with the Extended Finite Element Method （XFEM） by using the ABAQUS.Cracks in dangerous areas were simulated based on the three-dimension stress analysis.This paper simulated crack growth of a prestressed concrete continuous rigid frame bridge under the most unfavorable load case and analyzed the main factors that affect crack growth and their relative strength.It is found that the effective control of bottom plate longitudinal prestress force leads to a better control of bottom plate longitudinal cracking.
出处
《结构工程师》
北大核心
2013年第5期23-27,共5页
Structural Engineers
关键词
断裂力学
混凝土桥
底板纵向裂缝
fracture mechanics
concrete bridge
bottom plate longitudinal cracking
