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薛  豪¹，邵长江^1，2，崔皓蒙¹，王春阳¹

 

 

(1.西南交通大学 土木工程学院,成都 610031；

 

2.西南交通大学 陆地交通地质灾害防治技术国家工程研究中心，成都 610031)

摘要：

以国内某超大跨度悬索桥为工程背景，运用Abaqus软件建立桩-土相互作用模型，并在此基础上基于SAP2000软件，分别建立了考虑非线性桩-土相互作用、仅考虑线弹性桩-土相互作用(m法)和不考虑桩-土相互作用（塔底固结）三种边界条件的全桥模型，系统研究地震荷载作用下不同边界条件模拟方式对超大跨度悬索桥地震响应的影响机理。结果表明:地震荷载作用下，表层软土地基不会进入塑性阶段，深层岩石地基发生刚度退化进入塑性阶段；塔底固结方案的塔柱位移与内力响应均与其他方案相差较大；在横竖向地震作用下，不同边界条件对结构响应影响差异较纵竖向地震更大；m法模型位移与内力响应均略小于非线性模型，使用m法模拟超大跨度悬索桥边界条件可能会使结构偏于不安全。研究成果可为类似桥梁工程的抗震设计及桩-土相互作用分析提供理论依据和技术参考。

关键词：超大跨度悬索桥；桩-土相互作用；m法；地震响应

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

 

 

XUE Hao¹,SHAO Changjiang^1,2,CUI Haomeng¹,WANG Chunyang¹

 

 

(1.School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China；

 

2.National Engineering Research Center of Geological Disaster Prevention Technology in Land Transportation,Southwest Jiaotong University,Chengdu 610031,China)

 

Abstract：Taking a super-long-span suspension bridge in China as the engineering background,this study established a pile-soil interaction model using Abaqus software.Based on this model,three full-bridge models were developed using SAP2000 software,considering three boundary conditions: nonlinear pile-soil interaction,linear elastic pile-soil interaction (m-method),and no pile-soil interaction (tower base fixed).The study systematically investigated the influence mechanisms of different boundary condition simulation methods on the seismic response of super-long-span suspension bridges under seismic loads.The results indicate that under seismic loads,the surface soft soil foundation does not enter the plastic stage,while the deep rock foundation undergoes stiffness degradation and enters the plastic stage;The displacement and internal force response of the tower column in the tower bottom consolidation scheme are significantly different from those in other schemes;The difference in the impact of different boundary conditions on structural response under horizontal and vertical earthquakes is greater than that under vertical earthquakes;The displacement and internal force response of the M-method model are slightly smaller than those of the nonlinear model.Using the M-method to simulate the boundary conditions of a long-span suspension bridge may make the structure more unsafe.The research results can provide theoretical basis and technical reference for seismic design and pile-soil interaction analysis of similar bridge engineering.

 

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

基金项目：四川省自然科学基金项目（2024NSFSC00185）。

作者简介：薛  豪（1996—），男，硕士研究生，研究方向:桥梁抗震。

收稿日期：2025-01-16