高墩大跨径连续刚构弯桥全过程非线性稳定分析  

Nonlinear stability of long-span curve rigid bridge with high piers in whole process

作　　者：王钧利[1] 贺拴海[1] 

机构地区：[1]长安大学桥梁与隧道陕西省重点实验室,陕西西安710064

出　　处：《长安大学学报（自然科学版）》2008年第3期49-52,共4页Journal of Chang’an University(Natural Science Edition)

基　　金：国家西部交通建设科技项目(200731881232)

摘　　要：基于非线性稳定理论,利用有限元法,对高墩大跨径连续刚构弯桥在悬臂施工和营运全过程中进行了特征值屈曲分析和考虑材料非线性大变形的稳定分析;对不同曲线圆心角、墩身长细比及考虑温度变化引起侧移的情况进行非线性稳定分析,归纳出高墩大跨径弯桥在施工和营运阶段的稳定荷载系数与弯桥圆心角、墩身长细比和温度变化的关系。结果表明:悬臂施工阶段是高墩大跨径弯桥施工和营运全过程稳定性的控制阶段,弯桥在施工阶段的非线性稳定荷载系数为成桥状态的63%;其非线性稳定荷载约为特征值屈曲荷载的40%;营运阶段墩身长细比的影响更为突出;温度变化对桥梁稳定性影响甚微。Based on finite element theory, considering the geometry nonlinear and material nonlinear, the stability of curve rigid frame bridge with high pier and large span in the stages of cantilever construction and service is analyzed by finite element method. Through comparing and classifying the results of different central angles of curve and slenderness ratio of pier, the relation of the critical load parameter with the central angle of curve and slenderness ratio of piers is summarized. The results show that the stability coefficient of bridge during its cantilever construction is the smallest, its stability coefficient is 63% of the one in service stage; the nonlinear stability coefficient is about 40% of the eigenvalue flexure load; in service stage, the slenderness ratio of pier has great influence on stability coefficient; the temperature variety has a little influence on the stability. 4 tabs, 3 figs, 8 refs.

关 键 词：桥梁工程 高墩大跨径刚构弯桥 全过程 非线性稳定 

分 类 号：U445.71[建筑科学—桥梁与隧道工程]