摘要
钢桁架结构跨越能力强、施工便捷、低碳经济,广泛应用于跨河桥梁,易受局部环境较高湿度影响发生锈蚀。依托实际跨河桥梁工程,研究其锈蚀钢桁架结构剩余承载力:基于现场调查分析锈蚀情况;在此基础上,基于截面积分梁理论,考虑双重非线性效应,通过结构广义刚度确定锈蚀结构剩余承载力,研究其极限状态;分析不同锈蚀厚度下剩余承载力,所得锈蚀0.33、1.11、1.50 mm下剩余承载力分别下降5.5%、18.8%、25.3%;基于数值分析结果采用最小二乘法(LSM)拟合承载力预测公式,11组锈蚀情况下预测公式结果相较数值分析结果最大误差0.08%,预测公式计算的依托工程剩余承载力下降了9.4%。研究成果为依托工程运行管理提供了科学指导,建立的剩余承载力预测方法可以推广至同类型跨河桥梁钢桁架结构,具有理论和实践意义。
Steel truss structures are widely used in river-crossing bridges due to their strong spanning capacity,convenient construction,low-carbon,and low-cost.However,they are prone to corrosion when exposed to high humidity in rivers'local environments.Based on an actual river-crossing bridge project,this study investigates the residual bearing capacity of corroded steel truss structures.The corrosion condition was analyzed through field investigation.Subsequently,considering dual nonlinear effects,the residual bearing capacity and ultimate state of the corroded structure were determined using structural generalized stiffness based on the sectional integration beam theory.The analysis of residual capacity under different corrosion thicknesses revealed reductions of 5.5%,18.8%,and 25.3%at corrosion depths of 0.33 mm,1.11 mm,and 1.50 mm,respectively.A prediction formula for bearing capacity was fitted using the Least Squares Method(LSM)based on numerical analysis results.The maximum error between the formula's predictions and numerical results across 11 corrosion conditions was 0.08%.The formula predicted a 9.4%reduction in residual capacity for the subject project.The research outcomes provide scientific guidance for the operation and management of the subject project.The established residual bearing capacity prediction method can be extended to similar river-crossing steel truss bridges,demonstrating both theoretical and practical significance.
作者
苏涛
章煊
张佳伟
李洹臣
冯宇航
张依心
SU Tao;ZHANG Xuan;ZHANG Jiawei;LI Huanchen;FENG Yuhang;ZHANG Yixin(Beijing Urban Rivers and Lakes Management Office,Beijing 100144,China;China Institute of Water Resources and Hydropower Research,Beijing 100038,China;State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,Beijing 100038,China;Key Laboratory of Engineering Materials of Ministry of Water Resources,Beijing 100038,China)
出处
《北京水务》
2025年第3期65-71,共7页
Beijing Water
基金
中国水科院基本科研业务费项目(SM0145C012024,SM0145C022024)
山东省土木工程防灾减灾重点实验室开放基金(CDPM2023KF11)。
关键词
钢桁架结构
锈蚀
剩余承载力
双重非线性
steel truss structures
corrosion
residual bearing capacity
dual nonlinear effects
