基于疲劳可靠度矮塔斜拉桥拉索容许应力分析  

Analysis on Cable Permissible Stress of Extradosed Cable-stayed Bridge Based on Fatigue Reliability

作　　者：刘沐宇[1] 涂开智[1] 孙向东[1,2] 袁卫国[1,2] 

机构地区：[1]武汉理工大学道路桥梁与结构工程湖北省重点实验室,武汉430070 [2]广东省公路勘察规划设计院,广州510507

出　　处：《武汉理工大学学报》2009年第14期52-56,共5页Journal of Wuhan University of Technology

基　　金：武汉市建设科研项目(200619)

摘　　要：由于矮塔斜拉桥斜拉索承担荷载的比例较小,设计时其容许应力值比常规斜拉桥的取值要大。随着设计容许应力值的增大,其抗疲劳性能成为设计人员关心的问题。因此,从疲劳可靠度理论出发,运用基于拉索疲劳寿命服从Weibull分布的疲劳可靠度公式,对江肇高速公路西江特大桥拉索在活载作用下的疲劳可靠度进行了评估,分析得到了单索面矮塔斜拉桥拉索设计容许应力值的合理取值。分析结果对同类型矮塔斜拉桥的设计有一定的参考意义。Because of the low loading shares, the cable permissible stress of extradosed cable-stayed bridge is chosen greater than the general cable-stayed bridge in design. With the permissible stress value increasing, the cable＇ s fatigue resistance property is a problem that designers concern about. Based on fatigue reliability, this paper makes an assessment on fatigue reliability of Xijiang Bridge＇s cables in live load. The fatigue reliability formulas in which the cables＇ fatigue life obey to the Weibull distribution is used. According to the analysis above, the reasonable cable permissible stress value of extradosed cable-stayed bridge with single cable plane is put forward. The conclusion can be used as reference for design of the same type bridge.

关 键 词：矮塔斜拉桥 斜拉索 应力幅 疲劳可靠度 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]