PC连续刚构桥长期下挠参数敏感性分析

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QIAN Ruolin，SU Pei，HUANG Chunhui

（Civil Engineering College， Shannxi Polytechnic Institute， Xianyang 712O0O， China）

Abstract：Withthecontinuous promotionoftheconstructionofatransportation powerhouse，PCcontinuous rigidframebridges are widelyusedindiversifiedbridgeconstructionduetotheirexcellentcrossing abilityanddurability.However，theposible downarddeflectionisues thatmayoccurduringlong-termuseofthis bridgestructure haveasignificantimpactonitsstability andservice life.Basedonthefiniteelementsimulationmodeloftheentire bridge，fourmain parameters，namelyself weight， crep，prestressloss，and stfness reduction，were selectedto studythesensitivityof their downward deflection performance. Theresultsindicatethattheincreaseinoverweightofconcrete，shortinitialloadingage，bridgecompletiontime，lossof prestress，andreductioninstfnesscanallhaveadverseefectsonthelong-termdeflectionofthebidge.Targetedmeasures can efectivelyavoidthesustaineddevelopmentof long-term deflection.Inorder tomakescientific decisionsin design， construction，andoperation，and provide theoretical supportandtechnical gudance fortheconstructionofsimilarbridges.

Keywords：continuous rigid frame bridge；deflection；finite element analysis；sensitivity analysis

0 引言

现代社会对交通运输系统的依赖程度较高，桥梁作为交通系统中的关键组成部分，其功能和结构安全性对于社会和经济活动的稳定性至关重要。（剩余5769字）