基于模型修正的桥梁结构性能推演研究

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中图分类号：TU317 文献标志码：A 文章编号：2095-2945（2026）01-0007-0：

Abstract：Touselong-term monitoringdata toasess the healthof bridge structuresanddeducethe degreeofstructural degradation，aninitialdesignmodelofthebridgewasconstructedbasedonengineeringdrawings.Thismodelwasthenrefined usingmodalfrequencyasanobjectivefunctiontoestablishanoperationalmodelthatreflectsactualbridgeconditions.Basedon thisrefinedmodelandcombiningmonitoringdatawithon-siteinspection，thecausesofstructuralstifnessdegradationwere identifiedandquantifiedthroughmodelupdatingtheory.Abridgeperformancepredictionmethodbasedonmodelupdatingwas proposed.Thestudyresultsindicatethattheupdatedoperationalmodelmoreacuratelyrepresentsthebridge'sactual performance，withpredictedperformancetrendsaligningcloselywithmeasureddata.Throughon-siteinspections，itwasfurther confimedthatthemaincauseofstructuraldegradationisthereductionintheefectivecrosssectionoftheboxgirder.The proposedmethodsignificantlyimproves theacuracyofurban bridgeperformanceanalysis，providingesentialtechnicalsupport for real-time monitoring and maintenance decision-making.

Keywords：urban bridge;structural health monitoring;model updating;modal frequency;performance analysis

现代城市基础设施中，桥梁作为重要的交通枢纽，承担着大量的交通负荷，维护其结构安全和功能的稳定性是城市可持续发展的关键环节。（剩余5817字）