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桥梁多灾害设计荷载系数确定方法探讨 被引量:7

Method of load factor determination for multi-hazards bridge design
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摘要 目前美国的桥梁设计多采用荷载与抗力系数法规范(LRFD),其荷载系数和抗力系数是以概率为基础的极限状态方程的形式求得的。荷载与抗力系数规范(LRFD)主要标定常规荷载和单个极端荷载,没有考虑多个极端荷载的情况,而且LRFD对于单个极端荷载的考虑并没有基于概率基础。该文针对多种极端荷载下荷载系数设计存在的问题,将多种极端荷载视为随机过程,以失效概率为纽带,提出荷载系数设计的分项失效概率概念。基于LRFD极限状态方程的形式,提出解决多种极端荷载作用下的MH-LRFD荷载系数计算方法,并给出当仅有两种极端荷载下,桥梁结构多灾害设计荷载系数的一般计算步骤。 目前美国的桥梁设计多采用荷载与抗力系数法规范(LRFD),其荷载系数和抗力系数是以概率为基础的极限状态方程的形式求得的。荷载与抗力系数规范(LRFD)主要标定常规荷载和单个极端荷载,没有考虑多个极端荷载的情况,而且LRFD对于单个极端荷载的考虑并没有基于概率基础。该文针对多种极端荷载下荷载系数设计存在的问题,将多种极端荷载视为随机过程,以失效概率为纽带,提出荷载系数设计的分项失效概率概念。基于LRFD极限状态方程的形式,提出解决多种极端荷载作用下的MH-LRFD荷载系数计算方法,并给出当仅有两种极端荷载下,桥梁结构多灾害设计荷载系数的一般计算步骤。
出处 《土木工程学报》 EI CSCD 北大核心 2012年第S2期76-79,共4页 China Civil Engineering Journal
基金 国家自然科学基金重点项目(50938006) 国际科技合作项目(2010DFA71240) 基本科研业务专项经费(2010B10)
关键词 多灾害 LRFD 地震 随机过程 荷载系数 失效概率 multi-hazards LRFD earthquake random process load factor failure probability
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参考文献10

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二级参考文献9

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共引文献4

同被引文献90

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  • 2刘晓鹏,蒋峰.碳纤维在旧桥加固中的应用[J].山东交通学院学报,2007,15(2):66-68. 被引量:1
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