斜拉桥由成桥状态求解施工初始索力方法研究  

Method of Solving Initial Construction Cable Force of Completed Cable-Stayed Bridge

作　　者：徐郁峰[1] 陈斯 谢云飞 朱梦阳 XU Yufeng;CHEN Si;XIE Yunfei;ZHU Mengyang(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5期201-209,共9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：该文针对斜拉桥由成桥状态求解施工初始索力的问题,提出一种结合无应力索长与正装迭代的方法。该方法首先由成桥状态计算斜拉索无应力长度,然后基于无应力索长进行施工正装计算,求得拉索原始初始索力,再通过差值迭代调整施工初始索力,最后根据主塔变形微调施工初始索力,来获取满足偏差要求的成桥状态。以一座斜拉桥为研究背景,该桥已知成桥目标状态,采用该方法确定施工过程的张拉索力。通过算例说明该方法不需要进行复杂计算,能取得满足工程精度的结果。To solve the initial construction cable forces of a completed cable-stayed bridge,a method that combines unstressed cable length and forward-iteration is proposed.Firstly,the unstressed length of each cable is calculated according to the completed bridge state.Then,the initial cable forces are obtained by using the unstressed cable length for the forward analysis.The initial construction cable forces are adjusted by difference iteration.Finally,the initial construction cable forces are fine-tuned according to the deformation of the pylon deformation to obtain the bridge completion state that satisfies the deviation requirements.The proposed method is employed in a cable-stayed bridge with a known completion state to calculate the initial construction cable forces.The example shows that the calculation workload can be reduced by this method.The deviation of this completed state from target meets engineering accuracy requirements.

关 键 词：斜拉桥 成桥状态 无应力索长 施工初始索力 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]