摘要
以工程结构可靠度理论为基础,结合重庆地维长江大桥(斜拉桥)主梁受力特点建立主梁关键截面承载能力极限状态方程。运用一次二阶矩法计算主梁关键截面可靠度指标,评价主梁承载能力是否基于安全期内。其可靠度指标随截面承受弯矩的增大而增大,反之,可靠度指标较小,反映出桥梁设计者的目标;同时分析各参数对主梁可靠度的影响程度,在设计基准期内,活载较恒载对主梁的可靠度影响显著。因此,主梁可靠度分析对完善斜拉桥设计理念、运营阶段维护和健康监测有一定的指导意义。
Based on the structural reliability theory and with reference to the characteristic of Chongqing Diwei Changjiang bridge （cable stayed bridge） girder, the limit state equation about carrying capacity at key sections is established. The first-order second-moment method is employed to calculate the reliability of girders, and to evaluate whether the carrying capacity is safe or not. The results show that reliabilities turn higher as the section moments increase; whereas9 the smaller moments mean the lower reliabilities. As a result, it reflects the objects of bridge designer. At last, the degrees that every parameter affects the reliability of girders are analyzed. The section resistance of girders affects the reliability obviously, because the internal forces caused by dead loads occupy the greatest portion of the total internal force. And the moments caused by live load are very evident. As a result, the influences of llve load are greater than the dead load during the designed service period. So the reliability analysis of girder is meaningful for the improvement of the design ideology, the maintenance and healthy monitoring of cable-stayed bridge during service stage .
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2006年第3期87-91,共5页
Journal of the China Railway Society
关键词
斜拉桥
一次二阶矩法
结构可靠度
主梁
参数
cable-stayed bridges first-order second-moment method
structural reliability
main girder
parameter
