考虑桩-土相互作用的超大跨度悬索桥地震响应研究

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中图分类号：U448.25；TU473 文献标志码：A 文章编号：1005-8249（2025）06-0095-08

DOI：10.19860/j.cnki.issn1005-8249.2025.06.017

Abstract：Takingasuper-long-spansuspensionbridge in Chinaastheengineeringbackground，this studyestablishedapilesoil interaction model using Abaqus software.Basedonthis model，three full-bridge models were developed using SAP2000 software，considering hree boundaryconditions；nonlinear pile-soil interaction，linearelasticpile－soil interaction（mmethod），andnopile-soil interaction（towerbasefixed）．Thestudysystematically investigatedthe influencemechanismsof diferent boundary condition simulation methods on the seismic response of super-long-span suspension bridges under seismic loads.Theresults indicate thatunderseismic loads，thesurface softsoil foundationdoes not enter theplasticstage，while the deeprock foundationundergoes stfessdegradationandenterstheplasticstage；Thedisplacementand interal forceresponse of thetowercolumninthetowerbottomconsolidationschemearesignificantlydiferentfromthoseinotherschemes；The diference intheimpactofdiferentboundaryconditionsonstructuralresponseunderhorzontalandverticalearthquakesisgreater thanthatunderverticalearthquakes；ThedisplacementandintemalforceresponseoftheM-methodmodelareslightlysmaller thanthoseof thenonlinear model.Usingthe M-methodto simulatethe boundaryconditions of along-span suspension bridge maymakethe structure more unsafe.Theresearch results can providetheoreticalbasis andtechnicalreference forseismic design and pile- soil interaction analysis of similar bridge engineering.

Key words： super-long-span suspension bridge；pile-soil interaction； m method; earthquake response

0 引言

桩-土相互作用问题一直以来受到了抗震工作者的重视，在地震工程、防灾减灾及防护工程等领域是一个十分重视的问题[1]。（剩余7661字）