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即将颁布执行的新《公路钢筋混凝土及预应力混凝土桥涵设计规范》(简称新《桥规》)废弃了以往的容许应力设计法,而采用极限状态设计法进行桥梁计算。因此,本文介绍一点有关极限状态设计法的基本知识,供参考。 一、极限状态设计法的 基本原理 容许应力设计法是公路桥梁界众所周知的设计方法,它的基本原理可概括为一句话,即,按弹性匀质体力学方法求结构中的应力,当结构中任一点的应力都不大于材料的容许应力时,则认为结构是安全的。这句话包含三个意思,即:
The forthcoming promulgation of the Code for Design of Bridges and Culverts of Highways and Reinforced Concrete and Prestressed Concrete (“Bridge Regulations”) abolished the previous allowable stress design method and adopted the limit state design method for bridge calculation. Therefore, this article introduces some basic knowledge of the design method of limit state for reference. First, the basic principle of the limit state design method Allowable stress design method is a well-known highway bridge design method, its basic principle can be summarized as a sentence, that is, according to elastic homogeneous body mechanics method to find the stress in the structure, when the structure Any point of stress is not greater than the allowable stress of the material, the structure is considered safe. This sentence contains three meanings, namely: