非弹性连接对三塔悬索桥地震响应的影响
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摘要
为了研究超大跨度三塔悬索桥动力响应,以泰州长江公路大桥为例,基于ABAQUS平台建立脊骨梁有限元模型,并在静力几何非线性初始平衡态基础上进行动力分析,研究其地震响应特点及塔梁间非弹性连接的减震效果。结果表明:加劲梁的地震轴力峰值在中塔两侧呈对称线性分布;横桥向剪力波动明显小于竖桥向;竖桥向弯矩分布相对均匀;横桥向弯矩明显大于竖桥向弯矩,并且具有较强的波动性;横桥向弯矩、剪力均在中塔处出现峰值;非弹性连接可有效减小塔梁纵桥向相对位移;边塔处塔梁纵桥向相对位移及塔底纵桥向剪力峰值均与初始刚度近似呈线性关系;梁端部分的轴力随非弹性连接初始刚度的增大而增大,跨内极小值向中塔靠近;合理参数设置的非弹性连接可取得良好减震效果。
Taizhou Bridge was taken as an example to investigate the characteristics of seismic response of the triple-tower bridge and the influence of inelastic connections on the seismic response of the bridge.3D finite element model with beam element was established based on ABAQUS and the nonlinear static analysis was carried out to get the initial equilibrium state of the bridge before the dynamic analysis was performed.The results indicate that the peak axial forces of the girder exhibit a symmetrical linear distribution about the mid-tower;the change in the transverse shear forces of the girder is smaller than that in vertical shear forces;the distribution of vertical moments is relative uniform along the length of the girder;the transverse moments of the girder are larger than vertical moments;the dramatic change of the transverse moments is observed and the vertical shear forces and moments of the girder get their maximum values at the section near mid-tower.Inelastic connections(IECs) can significantly reduce the relative displacement between the girder and the tower in the longitudinal direction;the relative displacements between the girder and the tower at the side-tower and the shear forces at the side-tower in the longitudinal direction all vary linearly with the initial stuffiness of the IECs;the axial forces of girder near the end of girder increase with the initial stiffness of IECs and the minimum value moves toward mid-tower;and the inelastic connections between girder and tower with reasonable parameters can lead to significant reduction of the seismic response.
Taizhou Bridge was taken as an example to investigate the characteristics of seismic response of the triple-tower bridge and the influence of inelastic connections on the seismic response of the bridge.3D finite element model with beam element was established based on ABAQUS and the nonlinear static analysis was carried out to get the initial equilibrium state of the bridge before the dynamic analysis was performed.The results indicate that the peak axial forces of the girder exhibit a symmetrical linear distribution about the mid-tower;the change in the transverse shear forces of the girder is smaller than that in vertical shear forces;the distribution of vertical moments is relative uniform along the length of the girder;the transverse moments of the girder are larger than vertical moments;the dramatic change of the transverse moments is observed and the vertical shear forces and moments of the girder get their maximum values at the section near mid-tower.Inelastic connections(IECs) can significantly reduce the relative displacement between the girder and the tower in the longitudinal direction;the relative displacements between the girder and the tower at the side-tower and the shear forces at the side-tower in the longitudinal direction all vary linearly with the initial stuffiness of the IECs;the axial forces of girder near the end of girder increase with the initial stiffness of IECs and the minimum value moves toward mid-tower;and the inelastic connections between girder and tower with reasonable parameters can lead to significant reduction of the seismic response.
引文
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[3]郝超,强士中,刘民.白沙洲长江大桥不同主梁纵向约束方式及其对结构抗震性能的影响[J].中国公路学报,1999,12(4):22-28.HAO Chao,QIANG Shi-zhong,LIU Min.Analysis ofDifferent Longitudinal Restraint Conditions in MainGirder and Their Effects on the Seismic Behavior ofWuhan White Shoal Yangtz River Bridge[J].ChinaJournal of Highway and Transport,1999,12(4):22-28.
[4]OKAMOTO Y,NAKAMURA S.Static and SeismicStudies on Steel/Concrete Hybrid Towers for Multi-span Cable-stayed Bridges[J].Journal of Construc-tional Steel Research,2011,67(2):203-210.
[5]APAYDIN N M.Earthquake Performance Assess-ment and Retrofit Investigations of Two SuspensionBridges in Istanbul[J].Soil Dynamics and EarthquakeEngineering,2010,30(8):702-710.
[6]MCDANIEL C C,SEIBLE F.Influence of InelasticTower Links on Cable-supported Bridge Response[J].Journal of Bridge Engineering,2005,10(3):272-280.
[7]阮静,马如进.三塔双跨悬索桥动力特性分析[J].中国工程科学,2010,12(8):83-87.RUAN Jing,MA Ru-jin.Dynamic Behavior Analysisof Taizhou Bridge[J].Engineering Sciences,2010,12(8):83-87.
[8]邓育林,彭天波,李建中,等.大跨度三塔悬索桥动力特性及抗震性能研究[J].振动与冲击,2008,27(9):105-110.DENG Yu-lin,PENG Tian-bo,LI Jian-zhong,et al.Study on Dynamic Characteristic and Aseismic Per-formance of a Long-span Triple-tower SuspensionBridge[J].Journal of Vibration and Shock,2008,27(9):105-110.
[9]王胜斌,朱宇,李建中.马鞍山三塔悬索桥抗震性能研究[J].公路交通科技,2009,26(12):91-95.WANG Sheng-bin,ZHU Yu,LI Jian-zhong.Researchof Seismic Performance of Ma'anshan Three-pylonSuspension Bridge[J].Journal of Highway andTransportation Research and Development,2009,26(12):91-95.
[10]YOSHIDA O,OKUDA M,MORIYA T.StructuralCharacteristics and Applicability of Four-span Sus-pension Bridge[J].Journal of Bridge Engineering,2004,9(5):453-463.
[11]ABDEL-GHAFFAR A M,NAZMY A S.3-D Nonlin-ear Seismic Behavior of Cable-stayed Bridges[J].Journal of Structural Engineering,1991,117(11):3456-3476.
[12]INGHAM T J,RODRIGUEZ S,NADER M.Nonlin-ear Analysis of the Vincent Thomas Bridge for Seis-mic Retrofit[J].Computers and Structures,1997,64(5/6):1221-1238.
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