非弹性连接对三塔悬索桥地震响应的影响  

Influence of Inelastic Connection on Seismic Response of Triple-tower Suspension Bridge

作　　者：焦常科[1,2] 李爱群[1] 

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,江苏南京210096 [2]中交第三航务工程勘察设计院有限公司,上海200032

出　　处：《中国公路学报》2013年第1期98-105,共8页China Journal of Highway and Transport

基　　金：国家杰出青年科学基金项目(50725828)

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 seismicresponse 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 ofthe 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 inthe 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 transversemoments 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 maximumvalues 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 relativedisplacements 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 axialforces 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 withreasonable parameters can lead to significant reduction of the seismic response.

关 键 词：桥梁工程 三塔悬索桥 有限元方法 地震响应 减震措施 非弹性连接 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]