Abstract: A general static model of the bridges compression members under concentrated transverse loads is set up in simulation of the simple model supporting the Shanley Theory which can satisfactorily explain the behavior of the axially loaded compression member in elasto plastic instability.The analysis based on the model gives the new concept of critical transverse loads as well as the worst acting location of the transverse loads.

Key words: beam column, elasto plastic instability, critical transverse loads

摘要： 借助中心压杆弹塑性失稳的山雷 (Shanley)理论,利用静力平衡条件,针对桥梁结构中各型承压杆件在横桥向集中荷载作用下的梁 柱力学行为进行了建模分析,提出了横向临界力概念,探讨了横向集中荷载最不利作用位置的确定方法

关键词: 梁柱, 弹塑性失稳, 横向临界力