摘要
为阐明在桥梁设计中,运用冗余度理念的重要性,从桥梁破坏案例入手,由桥梁整体结构对于局部构件失效的反应,引入桥梁设计冗余度的概念。进而展开分析桥梁体系的3种冗余度表现形式,即内部冗余度,结构冗余度,传力途径冗余度。根据对美国交通研究委员会(TRB)历年在桥梁设计冗余度方面的研究成果的回顾,总结在钢桥设计中的特殊条款——断裂敏感度与冗余度的联系,并对冗余度在桥梁设计原则中的应用提出建议:①尽量采用连续的、整体性强的结构形式;②在桥梁设计规范中,具体制定桥梁对特殊事件(例如地震)的冗余度要求;③设计特大跨度桥梁时,关键构件的设计尽量提供多重传力途径。
To illustrate the importance of the redundancy concept in bridge design,the redundancy concept in the bridge design is introduced from aspect of response of the integral structure of a bridge to the failure of a local single component of the bridge according to the bridge failure cases and further,3 forms of expressions of the redundancy of the bridge system,such as the internal redundancy,structural redundancy and load transferring path redundancy,are analyzed.In terms of the review of the research findings of the Transportation Research Board on the redundancy in the bridge design over the years,the special provisions,the connection between the fracture sensitivity and redundancy in the steel bridge design,are summarized and the relevant suggestions on application of the redundancy in the design principle are made as follows：1） the structural type that is continuous and with good integrity should be used wherever possible; 2） in the codes for the bridge design,the redundancy requirements of the bridges for the particular events （such as the earthquake） should be specifically formulated and 3） when the very long span bridges are designed,the multiple load transferring paths should be possibly provided for the design of the critical components.
出处
《桥梁建设》
EI
CSCD
北大核心
2013年第5期93-98,共6页
Bridge Construction
基金
重庆市科委自然科学基金资助项目(cstc2012jjys30003)~~
关键词
桥梁设计
冗余度
桥梁事故
安全性
钢桥
疲劳断裂
bridge design
redundancy
bridge accident
safety
steel bridge
fatigue fracture
