基于事件树分析法的大跨斜拉桥施工事故分析  

FAILURE ASSESSMENT OF LARGE SPAN CABLE-STAYED-BRIDGE ACCIDENT DURING CONSTRUCTION BASED ON THE ETA

作　　者：郑荣跃[1] 简小生[1] 俞凯磊[1] 杨银赞[1] 

机构地区：[1]宁波大学建筑工程与环境学院,浙江宁波315211

出　　处：《工程力学》2008年第A01期203-208,共6页Engineering Mechanics

基　　金：宁波市自然科学基金项目(2006A610095)

摘　　要：以宁波招宝山大桥为研究背景,以其在建设过程中发生的主梁压溃事故原因分析为目标,提出应用事件树分析法对该桥梁施工事故进行仿真反演分析。具体步骤为,应用事件树分析法对所有可能事故原因进行定性分析,确定事故分析方案;应用仿真反演技术对事故分析方案进行定量仿真计算,反演出事故的真正原因和机理。计算分析表明该桥梁施工事故可能是三种原因共同作用的结果。其中,斜拉索局部超张拉是事故主要原因,底板厚度不足和脉动风对该事故也有一定的影响。分析结果表明:事件树分析法使得事故分析更为系统、全面。To find out the reason resulting in the crush of the girder of Zhaobaoshan Bridge in Ningbo during the construction, the approach of event tree analysis, which systematically takes into account any information on the uncertainties involved in the accident of structures, is applied to analyze the accident of Zhaobaoshan Bridge and is used to establish the accident scenarios qualitatively. The accident scenarios are calculated by simulation quantitatively, and the reason of the accident is inversed. The analysis reveals that there are three causes that are responsible for the accident of Zhaobaoshan Bridge： the overlarge force of some cables, the thinner of soleplate＇s thickness and the influence of fluctuating wind on the girder. Also, it indicates that the approach of event tree analysis makes the accident analysis more systematical and comprehensive.

关 键 词：大跨斜拉桥 事件树分析法 桥梁事故 仿真反演 脉动风 

分 类 号：U447[建筑科学—桥梁与隧道工程] U448.27[交通运输工程—道路与铁道工程]