基于缆索体系性能退化的悬索桥易损性分析  

Vulnerability Analysis of Suspension Bridges based on the Degradation of Cable System Performance

作　　者：巫生平[1] 

机构地区：[1]福建江夏学院工程学院,福建福州350108

出　　处：《福建建筑》2017年第4期70-73,共4页Fujian Architecture & Construction

基　　金：福建省中青年教师教育科研项目(JAT160555);福建江夏学院青年科研人才培育基金项目(JXZ2015011)

摘　　要：从结构正常使用极限状态的要求考虑,提出了缆索结构的易损性评价参数。以某自锚式悬索桥为工程背景,利用SAP2000有限元软件建立损伤模型,基于缆索整体性能退化和单根吊索断裂进行结构易损性分析。结果表明,缆索整体性能退化时,性能退化程度与结构易损性成非线性关系,且主缆易损性大于吊索易损性。当发生单根吊索断裂的极端事件时,短跨次短吊索和主跨跨中到辅助墩的吊索断裂会导致结构性能不满足正常使用极限状态的要求,在桥梁长期监测过程中应予以重视。A new parameter of vulnerability assessment for cable structure was proposed in this paper considering the requirement of servi- cing limit state. And then the vulnerability of an anchor suspension bridge was analyzed base on the degradation of cableg performance and single sling fracture. The model of which was established by the finite element software SAP2000. The results show that there was a nonlin- ear relationship between degradation degree of performance and structural vulnerability, when all the cableg performance was degenerated, and the vulnerability of main cable was greater than that of sling. The results also revealed the structure could not meet the requirements of serviceability limit state when some of the sling suddenly parted. It should be taken seriously in the process of long - term monitoring of bridges.

关 键 词：性能退化 悬索桥 缆索结构 易损性 监测 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]