摘要
针对大跨度斜拉桥主梁易发生颤振失稳的问题,基于现有的桥梁颤振分析及结构可靠性理论,将主梁颤振临界风速视为结构抗力变量,以主梁处随机风速为荷载变量建立了桥梁颤振动力可靠性分析的极限状态方程,并采用JC法对天津某桥主梁颤振可靠性进行了分析,得到了颤振失效概率,并得出了竖向刚度是影响颤振可靠度的一个关键指标的结论。
In order to calculate the failure probability of the girders on a long-span and flexible cable-stayed bridge, a reliability model based on the limit state equation for analyzing the girders flutter is established. The limit state equation is a function of the critical wind speed and the expected wind speed at the girder site. Then the JC approach was employed and the result was obtained. Finally, through the analysis of the results, the vertical inflexibility of the girders is reported as a main influence factor to the structural reliability.
出处
《自然灾害学报》
CSCD
北大核心
2007年第3期124-127,共4页
Journal of Natural Disasters
基金
国家自然科学基金(505779047)
关键词
结构可靠度
斜拉桥
主梁
颤振
structural reliability
cable-stayed bridge
girder
flutter
