钢管混凝土拱桥地震破坏评估研究  

Research on Seismic Damage Evaluation of CFST Arch Bridges

作　　者：谢开仲 吕文高[1] 覃乐勤[1] 蒙方成[1] 

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004

出　　处：《中国公路学报》2012年第2期53-59,共7页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(51068001);广西科学研究与技术开发计划项目(桂科攻0816006-7;桂科攻0992027-12);广西大学科研基金项目(XBZ100762)

摘　　要：为了研究钢管混凝土拱桥的地震破坏程度,基于变形或内力和能量的双重破坏准则确定钢管混凝土拱桥各部分杆件的破坏指数,建立整桥的破坏评估模型,提出钢管混凝土拱桥的地震破坏评估方法。采用数值模拟方法对钢管混凝土拱桥在恒载和地震荷载作用下的内力、变形和累积能量进行分析,对钢管混凝土拱桥进行地震破坏评估,最后以南宁市永和大桥为例进行了分析。结果表明:对于抗震设防烈度为7度的钢管混凝土拱桥,在8度地震作用下全桥处于完好状态,9度地震作用下处于轻微破坏状态,满足抗震设防要求,说明该评估方法能够对地震破坏给出较准确的评估结果。In order to study the seismic damage conditions of concrete filled steel tube（CFST） bridge from the internal force,deformation and energy,the damage indexes（DI） of all the members were calculated.The evaluation model of the bridge was established and the seismic damage evaluation method of CFST arch bridge was presented.In the research,the internal forces,deformations and accumulated energy of CFST arch bridge were analyzed by numerical simulations under dead load and earthquake,and the seismic damage of CFST arch bridge was evaluated with the example of Nanning Yonghe Bridge.The results show that for the 7-degree seismic fortification intensity zone,the bridge is in perfect condition under 8-degree earthquake and there is only slight damage under 9-degree earthquake,which indicates that the bridge can meet the demands of seismic fortification.

关 键 词：桥梁工程 钢管混凝土拱桥 双重破坏准则 破坏评估 破坏指数 评估模型 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]