近场及远场地震作用下管道悬索桥结构体系抗震性能分析  

Seismic Performance Analysis of Pipeline Suspension Bridge Structure under Near-field and Far-field Earthquakes

作　　者：彭厚路 张端品 来铁 赵永飞 鲁俊峰 PENG Hou-lu;ZHANG Duan-ping;LAI Tie;ZHAO Yong-fei;LU Jun-feng(Southwest Oil and Gas Field Sichuan CNG Co.Ltd.,Chengdu 610000,China;Sichuan Jiaoda Engineering Detection Consulting Co.Ltd.,Chengdu 610031,China)

机构地区：[1]西南油气田四川川港燃气有限责任公司,成都市61000 [2]四川交大工程检测咨询有限公司,成都市610031

出　　处：《公路》2025年第4期100-108,共9页Highway

摘　　要：为探究近、远场地震下大型跨越管道工程的动力行为,以某典型管道悬索桥为研究对象,采用Midas Civil软件建立其有限元模型,在考虑其空间几何非线性的基础上对体系开展动力特性分析,依照规范选取多条近场及远场地震记录,并按照“横向+竖向”的加载方式对结构进行非线性时程分析。结果表明,此类管道悬索桥结构体系较柔,低阶振动模态主要为结构的横向及竖向振动,且横向质量参与系数上升较快;近场地震动的显著速度脉冲成分会明显放大结构构件的地震反应;横竖向地震下主梁位移的分布趋势与结构一阶振动形式一致,为正对称侧弯;受到与桥塔的横竖向耦合振动作用,墩身的轴力与剪力变化趋势为阶梯状,弯矩分布为ε形;在罕遇地震下,桥墩易受到近场地震动的破坏作用,且横梁的损伤情况较严重,在基本地震水准下,横梁在近场地震动下就会出现塑性铰。该管道悬索桥的抗震性能满足要求,在远场地震动下的安全储备较高,但需重点考虑近场地震动对此类结构体系抗震性能的不利影响。To explore the dynamic behavior of large-scale pipeline engineering under near-field and farfield earthquakes,a finite element model of a typical pipeline suspension bridge is established by Midas Civil.Based on the consideration of its spatial geometric nonlinearity,the dynamic characteristics of the structure system are analyzed.Multiple near-field and far-field ground motions are selected according to the specifications,and the structure is subjected to nonlinear time history analysis through the lateral+vertical loading method.The results show that the structural system of the type of pipeline suspension bridge is relatively flexible,with low order vibration modes mainly consisting of lateral and vertical vibrations of the structure,and the lateral mass participation coefficient increases rapidly.The significant velocity pulse component of near-field vibration would significantly amplify the seismic response of structural components.The distribution trend of displacement of the main beam under horizontal and vertical ground motions is consistent with the first-order vibration form of the structure,which is a symmetrical lateral bending.Under the lateral and vertical coupling vibration with the bridge tower,the axial force and shear force of the pier body show a stepped trend,and the bending moment distribution is in a"e"shape.Under rare ground motion,bridge piers are susceptible to damage from near-field vibrations,and the damage to the crossbeam is severe.Under basic ground motion,plastic hinges would appear on the crossbeam under near-field seismic excitation.The seismic performance of the pipeline suspension bridge meets the requirements and have a high safety reserve under far-field seismic action.However,it is important to consider the adverse effects of near-field ground motions on the seismic performance of such structural systems.

关 键 词：桥梁工程 管道悬索桥 近场地震动 速度脉冲成分 地震响应规律 损伤状态评估 

分 类 号：U448.25[建筑科学—桥梁与隧道工程] U442.55[交通运输工程—道路与铁道工程]