山区高墩大跨度连续刚构桥稳定性与参数影响分析

摘要

On the background of a long -span continuous rigid -frame highway bridge with high piers in moun-tain areas,linear elastic stabilities were analyzed at the stages of completion of pier construction,the largest can-tilever and completion of the whole bridge for finding the minimum stability safety coefficient ,respectively.On this basis,nonlinear stability of the bridge was analyzed and the influences of nonlinear factors on stability were discussed.The influences of different parameters such as the concrete strength grade,longitudinal dimension of the pier,distance between the twin thin -walled piers,tie beam installation and foundation rigidity on stability were explored,and then some useful conclusions were drawn.The results can provide some references for the de-sign and construction of long -span continuous rigid -frame bridge with high piers.%以山区某高速公路高墩大跨度连续刚构桥为工程实例，对其在最高墩阶段、最大悬臂阶段和成桥阶段的线弹性稳定性进行计算，找出稳定安全系数最低的阶段。在此基础上，对其进行非线性稳定分析，讨论非线性因素对稳定性的影响，探讨相关参数如混凝土强度等级、桥墩纵向尺寸、双肢薄壁桥墩间距、系梁设置、基础刚度对稳定安全系数的影响，并得出结论，研究成果可为高墩大跨度连续刚构桥的设计与施工提供参考。