大水平力作用下组合墩台在引桥墩设计中的应用

Application of Combined Dolphins in Design of Piers under Large Level Force

针对工程中经常遇到的岩面较高的地质情况,在引桥墩的设计方案中首次采用将墩台分为2级的组合结构。此组合墩台,因缩短力臂从而减小大水平力作用下桩所承受的弯矩,避免以往斜桩难以站稳、普通直桩在水平力作用下产生大弯矩的不足。结合工程实例,介绍组合墩台的结构型式和工程应用情况,并利用大型有限元软件ANSYS建立模型,对桩的位移、内力等进行详细分析。计算结果表明,组合墩台结构型式合理可靠。

In the geological conditions of high rock level, a combined structure dividing pier into two layers is adopted in the pier design. This structure can decrease the moment of piles with reducing the length of arm of force and avoid the problems of standing unsteadiness of raking piles and large moment of the general straight pile under level force. Integrating with the practice of the project, the structure of combined pier and its application in the project are introduced, the pile displacement, internal force etc. are analyzed by the model set up by ANSYS. The results of calculation show that combined pier is a reasonable and reliable structure.