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本文所发展的弯矩曲线法是以压溃理论为基础,以实用压杆为分析对象,在求得压杆徽段在轴力和弯矩共同作用下的曲率后(建立M—P—φ关系),按给定杆长,荷载偏心和初曲,计算压溃荷载P_A。本文用H形和T形截面压杆叙述了计算过程。为了检验计算结果,与实验值和其它方法计算结果进行了比较,并对计算结果进行了分析。对今后《铁路桥涵设计规范》(文中简称《桥规》)修订提出了建议。
The method of bending moment curve developed in this paper is based on the theory of crushing, using the actual pressure bar as the object of analysis, and after obtaining the curvature of the pressure bar emblem under the combined effect of axial force and bending moment (establishing M-P-φ Relationships): Calculate the crush load P_A according to the given rod length, load eccentricity, and initial curvature. This paper describes the calculation process using H-shaped and T-shaped crossbars. In order to test the calculation results, the calculation results were compared with the experimental values and other methods, and the calculation results were analyzed. Suggestions were made for the revision of the “Code for the Design of Railway Bridges and Culverts” (abbreviated as “Bridge Regulation”) in the future.