铁道标准设计2024，Vol.68Issue(7)：92-100,9.DOI:10.13238/j.issn.1004-2954.202211090005
跨走滑断层大跨度桁架悬索桥地震响应分析
Seismic Response Analysis of Large-span Truss Suspension Bridge Across Strike-slip Faults
摘要
Abstract
Long-span bridges across faults may inevitably suffer fault dislocation.To explore the influence of ground motion parameters across strike-slip fault on the seismic responses of long-span suspension bridge,a whole bridge finite element model considering pile-soil interaction(m method)is established based on ABAQUS by taking a steel-truss suspension bridge with a main-span of 538 m as an example.Ground motions of strike-slip fault are synthesized by combining the artificial low-frequency and actual high-frequency seismic components,and the effects of permanent displacement,pulse period and cross-fault angle on the dynamic responses of long-span suspension bridge are investigated based on the non-uniform excitation displacement time history method.Results indicate that the growths in dynamic responses of bridge tower show different magnitudes with the increase of permanent displacement,especially the transverse displacement and shear force,as well as the longitudinal moment,which increase by 97%,88% and 95% respectively.The increase of shear force aggravates the risk of shear failure of bridge tower.The decrease of the pulse period will lead to a large difference between the longitudinal and transverse dynamic responses of the bridge tower.When the pulse period is less than 4s,the transverse displacement and shear force,as well as longitudinal moment of bridge tower increase more obviously than in the other direction,and the increases are 492.5%,170% and 189.2% respectively.Cross-fault angle has significant influence on the dynamic responses of the bridge tower,and the changes along the longitudinal and transverse directions tend to be opposite.When the cross-fault angle is 90°,the transverse displacement and shear force of bridge tower are the maximum,while the corresponding moment is the minimum,and the dynamic response of the bridge tower is in a reasonable range,which is the best crossing angle.关键词
大跨度悬索桥/走滑断层/地震动合成/永久位移/脉冲周期/跨断层角度/地震响应Key words
long-span truss suspension bridge/strike-slip fault/ground motion synthesis/permanent displacement/pulse period/cross-fault angle/seismic response分类
交通工程引用本文复制引用
邹作家,郑史雄,丁自豪,贾宏宇,余琦,程维..跨走滑断层大跨度桁架悬索桥地震响应分析[J].铁道标准设计,2024,68(7):92-100,9.基金项目
国家自然科学基金项目(52178169) （52178169）
