基于温致挠度反演的拱桥吊索索力评估方法  

Evaluation method of cable force of arch bridge suspender based ontemperature-induced deflection inversion

作　　者：瞿涛 陆满成 徐世阳 谢观福 王高新 QU Tao;LU Mancheng;XU Shiyang;XIE Guanfu;WANG Gaoxin(China Railway Bridge&Tunnel Technologies Co.,Ltd.,Nanjing 210061,China;China Railway Shanghai Bureau Group Co.,Ltd.,Shanghai 200071,China;School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中铁桥隧技术有限公司,江苏南京210061 [2]中国铁路上海局集团有限公司,上海200071 [3]中国矿业大学力学与土木工程学院,江苏徐州221116

出　　处：《自然灾害学报》2024年第6期169-177,共9页Journal of Natural Disasters

基　　金：江苏省科技厅重点研发计划项目(BE2018049);南京江北新区重点研发计划项目(ZDYF20200118);国家自然科学基金项目(51908545)。

摘　　要：为解决拱桥受力安全评估中的全桥吊索索力精准评估难题,基于某拱桥健康监测数据,利用相关性散点图研究了温度场与主梁挠度之间的相关特性,利用拱桥结构吊索索力的等效力学模型推导了拱桥全桥吊索索力与主梁挠度、温度场之间的数学关系,最终提出了基于温致挠度反演的拱桥全桥吊索索力评估方法。结果表明:挠度与温度具有明显的线性相关特性,因此在利用挠度反演索力时需要充分考虑温度影响;建立了吊索索力与主梁静挠度、温度场之间的多元线性数学模型,推导了考虑温致挠度影响的拱桥全桥索力反演公式。实桥测试结果表明,索力反演结果与实测结果误差在5%以内,验证了索力反演方法的准确性。In order to solve the problem of precise cable force assessment for the entire arch bridge in the assessment of its load-bearing safety,this research carries out a study on the correlation between temperature field of the bridge and deflection of the main beam using correlation scatter plots based on the monitoring data of an arch bridge,an equivalent mechanical model of cable forces of the arch bridge structure is derived to establish the mathematical relationship between cable forces of the entire arch bridge and the deflection of the main beam and the temperature field,and finally a method for assessing the cable forces of the entire arch bridge based on temperature-induced deflection inversion is proposed.The results show that the deflection and temperature have obvious linear correlation characteristics,so the influence of temperature on the deflection should be fully considered when using the deflection to invert the cable force.A multivariate linear mathematical model is established,and the inversion equation of cable forces of the whole arch bridge based on temperature-induced deflections is deduced.The monitoring results show that the error between the inverted result and the measured result is within 5%,which verifies the accuracy of the cable force inversion method.

关 键 词：拱桥 吊索索力 反演评估 温致挠度 温度相关性 

分 类 号：U446.2[建筑科学—桥梁与隧道工程]