我国现行《公路钢筋混凝土和预应力混凝土桥涵设计规范》规定,对所有的桥涵结构均应进行承载能力极限状态和正常使用极限状态的计算。为此本文偿试了用极限荷载法验算承载能力,该法建立在塑性基础上不分析单个截面,把承重结构当成整体来分析。并且可以直接算出承载能力极限状态的安全系数。 China’s current “Code for the Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts” stipulates that for all bridge and culvert structures, the calculation of the limit state and normal use limit state of the bearing capacity shall be carried out. For this reason, the ultimate load method was used in this paper to check the bearing capacity. The method is based on the plastic foundation and does not analyze individual sections. The load-bearing structure is considered as a whole for analysis. And can directly calculate the safety factor of the limit state of the carrying capacity.