摘要
Abstract
This paper takes a long-span continuous girder bridge as the research object and systematically conducts static and dynamic load test studies using a combined approach of theoretical analysis,numerical simulation,and field testing.By establishing a refined three-dimensional finite element model,the theoretical responses of the structure under design loads are calculated.Six static load conditions and multiple dynamic load test schemes are designed to comprehensively test the strain,deflection,and dynamic characteristics of key bridge control sections.The test results indicate that under equivalent design loads,the structural strain calibration coefficients range from 0.61 to 0.95,the deflection calibration coefficients range from 0.73 to 0.95,and the residual deformation ratios are all below 8%.Dynamic characteristic tests show that the fundamental frequency of the structure is 5.23 Hz,which is higher than the theoretical value of 3.85 Hz,and the impact coefficient ranges from 1.086 to 1.109,lower than the code-calculated value of 1.22.The study verifies that the bridge possesses excellent elastic working performance,sufficient load-bearing safety reserves,and superior dynamic characteristics.Additionally,a technical framework for bridge load testing is established,providing technical references for the inspection,evaluation,operation and maintenance of similar bridges.关键词
荷载试验/静力性能/动力特性/有限元分析/校验系数Key words
Load test/Static performance/Dynamic characteristics/Finite element analysis/Calibration coefficient分类
交通工程
