铁路桥梁承载能力可靠性分析

简述结构可靠度指标计算中心点法和验算点法的基本原理,编制了相应的计算程序。对时速160、200 km客货共线铁路预制预应力混凝土简支T梁和时速250、350 km客运专线铁路预制、现浇预应力混凝土简支箱梁,时速160、200、250 km客货共线铁路和时速120 km重载铁路(Z=1.2)道砟桥面简支钢桁梁,时速250 km客运专线铁路钢-混凝土简支、连续结合梁,时速160 km城际铁路钢管混凝土桁架连续梁等进行了承载能力可靠度指标校准计算,对铁路桥梁承载能力的可靠度指标给出了建议值。

Reliability Analysis on Bearing Capacity of Railway Bridge

In this article,the basic principle of both center point method and checking point method in structural reliability index calculation were briefed,while the corresponding calculation program was compiled.Moreover,adjustment and calculations of reliability indexes of bearing capacity for several kinds of railway girders were carried out,including precast prestressed-concrete simply supported T-girder on 160 km/h and 200 km/h mixed passenger and freight railways;precast and cast-in-situ prestressed-concrete simply box girder on 250 km/h and 350 km/h passenger-dedicated lines;ballasted-deck simple supported steel truss girder on 160 km/h,200 km/h and 250 km/h mixed passenger and freight railways and on 120 km/h heavy-haul railway(Z=1.2);steel-concrete simply supported girder and steel-concrete composite girder on 250 km/h passenger-dedicated line;and concrete-filled steel tube truss continuous girder on 160 km/h intercity railway.Finally,in this article,the suggestions on the values of bearing capacity reliability index of railway bridges were provided.