大型跨海桥梁基础结构正常使用极限状态的可靠度分析  

Reliability Analysis of Foundation Structures of Offshore Long-span-bridges on Serviceability Limit States

作　　者：胡琦忠[1] 金伟良[1] 史方华 陈向阳 陈国兴 

机构地区：[1]浙江大学结构工程研究所,浙江杭州310027 [2]浙江省交通规划设计研究院,浙江杭州310006

出　　处：《中国公路学报》2008年第1期53-58,共6页China Journal of Highway and Transport

基　　金：国家高技术研究发展计划(“八六三”计划)项目(2006AA04Z422);国家自然科学基金重点项目(50538070);国家西部交通建设科技项目(200131881213);浙江省科技厅重大科技项目(2006C13090)

摘　　要：针对大型跨海桥梁基础结构正常使用极限状态的设计条件不同于一般桥梁的特点,对各类不同设计领域的设计分项系数、目标可靠度指标及风荷载系数进行了分析和比较;然后以JCSS模式规范为基础,通过可靠度计算的验算点法,经过多次试算,建议了目标可靠度指标分别为1.5、2.0和2.3的三级可靠度水平及相应的可变荷载频遇值系数和准永久值系数。通过实际的结构设计证明了建议值是合理的,且对于大型跨海桥梁基础结构的设计和安全评估具有重要意义。Aimed at the characteristics that design offshore long-span-bridges are different from that o target reliability indices and the factors of wind load Then, three levels of target reliability indices which conditions of the foundation structures of f common bridges, the partial factors, the in different design fie are 1.5, 2.0 and 2.3 corresponding factors of frequent value and quasi-permanent value of live model code with JC method were an actual structural design, and suggested. Commended values it makes good sense for the lds were all analyzed. respectively, and the loads based on JCSS are proved to be reasonable with corresponding design and safety estimation of offshore long-span-bridge.

关 键 词：桥梁工程 大型跨海桥梁 验算点法 目标可靠度 频遇值 准永久值 基础结构 

分 类 号：U443.1[建筑科学—桥梁与隧道工程]