自锚式悬索桥主梁面内弹性稳定分析  

Vertical Elastic Stability Analysis of Main Girders in Self-Anchored Suspension Bridges

作　　者：魏标[1] 李建中[1] 

机构地区：[1]同济大学桥梁工程系,上海200092

出　　处：《结构工程师》2008年第4期36-39,共4页Structural Engineers

摘　　要：首先基于自锚式悬索桥等代梁理论分析其主梁面内弹性稳定特点,然后采用商业软件SAP2000建立一有限元实桥模型对主梁面内弹性稳定进行计算,同时考虑了主梁拱度、主梁材料形式和是否设置辅助墩等多个因素的影响。研究结果主要表明,自锚式悬索桥的主梁一阶模态失稳为整波失稳,同时不能按照简单的压弯杆件计算其稳定,主梁和主缆之间的荷载分配关系相对改善了主梁的一阶模态失稳。Firstly, based on equivalent-beam theory of self-anchored suspension bridge, the characteristic of vertical elastic stability of main girders in self-anchored suspension bridges was analysed. And then, based on commercial procedure SAP2000, the vertical elastic stability of a main girder was calculated by using FEM method, considering the influence of arch rise of the girder, beam material and piers. The results show the first buckling mode of the girder in self-anchored suspension bridge is the global wave buckling, its elastic stability trait is very different from simple beam under pressure and moment, and the load distribution relationship between the girder and cable is helpful to improve the vertical elastic stability of the girder relatively.

关 键 词：自锚式悬索桥 主梁 弹性稳定 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]