序列二次规划方法在斜拉桥索力调整中的应用研究  

Application of Sequential Quadratic Programming Method in Cable Force Adjustment of Cable-Stayed Bridges

作　　者：徐郁峰[1] 朱梦阳 陈斯 谢云飞 XU Yufeng;ZHU Mengyang;CHEN Si;XIE Yunfei(School of Civil Engineering and Transportation,South China University of Technology,Guangzhou,Guangdong 510641,China)

机构地区：[1]华南理工大学土木与交通学院,广东广州510641

出　　处：《中外公路》2024年第4期148-155,共8页Journal of China & Foreign Highway

基　　金：2020产学研类项目(产学研项目)(编号:x2tjB8200430);2019年中央高校基本科研业务费成果转化项目(自然科学类)(编号:x2tjD2192960)。

摘　　要：斜拉桥施工至成桥阶段时,由于各种因素影响,结构实际线形和内力与理论成桥状态相比,存在一定的误差,通常需要进行索力调整。该文针对斜拉桥在调索阶段的索力调整量计算问题,提出采用一种基于影响矩阵和序列二次规划求解索力调整量的方法。以某大跨度混合梁斜拉桥为背景,首先计算各索力单位变化下结构的线形和内力响应值,得到索力影响矩阵,然后选取合适的目标函数及约束条件,构建索力调整量计算模型,最后引入序列二次规划法求解索力调整量,得到索力调整后的结构内力与线形状态。计算结果表明:该方法计算简便,索力调整后的结构线形与内力均能满足施工控制要求。When the construction of a cable-stayed bridge enters the completion stage,due to various factors,there is a certain error between the actual alignment and internal force of the structure and the theoretical completion state,and it is usually necessary to adjust the cable force.In order to calculate the cable force adjustment of a cable-stayed bridge in the adjustment stage,a method based on an influence matrix and sequential quadratic programming was proposed to solve the cable force adjustment.A large-span hybrid girder cable-stayed bridge was taken as the background,and the alignment and internal force response values of the structure with varying cable units were calculated to obtain the influence matrix of the cable force.Then,suitable objective functions and constraints were selected to construct the calculation model of the cable force adjustment.Finally,the sequential quadratic programming method was introduced to solve the cable force adjustment,and the internal force and alignment state of the structure after the cable force adjustment were obtained.The calculation results show that the method facilitates calculation,and the alignment and internal force of the structure after the cable force adjustment can meet the construction control requirements.

关 键 词：斜拉桥 混合梁 索力调整 影响矩阵 序列二次规划 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]