建筑钢结构进展2025，Vol.27Issue(6)：65-73,9.DOI:10.13969/j.jzgjgjz.20240127001
基于多尺度数值分析方法的连续钢桁梁桥受力性能分析
Analysis of the Mechanical Performance of Continuous Steel Truss Bridges Using a Multi-Scale Numerical Analysis Method
摘要
Abstract
To thoroughly investigate the stress states during the construction stage of a long-span continuous steel truss bridge,field measurements were conducted to assess the vertical deformations and stresses at critical joints.Based on the principle of deformation coordination,a multi-scale numerical analysis model was developed,integrating joint entities and member systems,to capture the overall internal forces and local joint stress states of the bridge during its service stage.A comparative analysis was then performed,comparing the measured values of truss member deformations and stresses with the calculated values obtained from finite element analysis.The results indicate that the maximum vertical deformation of the bottom chord remains below 6 cm,representing a ratio less than 1/2300 to the calculated span.Additionally,the maximum measured stress in the member,located near the bottom chord of joint E8,is 32 MPa.Both the maximum deformation and stress values satisfy the design specifications.The measured and calculated values of the vertical deformation of the bottom chord exhibit a general consistency,with a discrepancy of less than 10mm.Specifically,the average error and average relative error are 1.27 mm and 6.8%respectively.Similarly,the average error and average relative error between the measured and calculated stress values of the members are 4.5 MPa and 11.2%,respectively,validating the effectiveness of the established finite element analysis model.When comparing the vertical deformations calculated by the multi-scale analysis model and the bar system model with the measured values,a good agreement is observed,with a maximum displacement error of less than 5%and a stress error of less than 6%.Both the multi-scale model and the bar system model exhibit a certain deviation in the average calculated values of joint stress and mid-span vertical deformation from the measured values,but these deviations remain within a relative error of less than 20%.However,the multi-scale model is particularly adept at accurately reflecting the local stress states at the joints.关键词
连续钢桁梁桥/成桥阶段/多尺度模型/实桥测试/受力特点/有限元分析Key words
continuous steel truss bridge/service stage/multi-scale numerical analysis model/real bridge test/stress characteristics/finite element analysis分类
交通运输引用本文复制引用
安鹏,王文炜..基于多尺度数值分析方法的连续钢桁梁桥受力性能分析[J].建筑钢结构进展,2025,27(6):65-73,9.基金项目
国家自然科学基金(51878156),中铁二十局集团科技研发项目(YF2201QL01B) （51878156）
