铁路钢板梁的承载力极限状态分析及抗力分项系数的确定

The Study of Ultimate Load States and The Determination of Part Parameters of Resistance for Railway Steel Girders

在研究无纵向加劲钢板梁极限承载力的基础上，本文研究纵向加劲铁路钢板梁在纯剪、纯弯和弯剪复合作用下的极限承载力，给出了计算公式．在计算可靠度指标的基础上，确定了抗力分项系数．按老规范的允许应力法和本文的极限状态法分别对比设计了6片不同的钢板梁．结果表明，极限状态法设计的梁比允许应力法经济、合理可靠．本文成果已纳入新规范．

Based on the study of the non-longitudinally stiffened steel girders,this paper researches the ultimate load of the longitudinally stiffened steel girders under the action of shear, moment as well as the combination of them, and gives caculating formulae. The part parameters of reistance are determined by computing reliabitity. Six steel girders are designed by means of both the permitting stress method of old code and the ultimate state method of this paper.It is shown from the results that the girders designed by the latter are more economic and more reliable than those by the former. The results of this paper have been put in the new code.