基于易损性的高墩多塔斜拉桥纵向减震控制研究

发布时间：2018-10-09 15:03

【摘要】：为研究常用的减震控制方式在高墩多塔斜拉桥这种新型结构中的减震效果,以一座墩高178 m的斜拉桥为例,建立了非线性有限元动力分析模型。从PEER强震数据库中选取80条实测地震波进行非线性时程分析;结合结构的特点,定义各关键构件的损伤指标;基于易损性分析理论,建立了关键构件及桥梁系统的易损性曲线;以铅芯橡胶支座和黏滞阻尼器为代表,通过易损性曲线对比研究了不同控制参数和布置形式下,位移型及速度型两类减震控制方式的减震效果;结合桥梁实际情况确定最优的减震方案。分析结果表明:由于高墩的影响,斜拉桥的支座系统、主梁和拉索的损伤概率显著增加,而索塔损伤相对轻微;由于传力机理的差异,不同布置形式下控制参数对减震效果的影响规律不同;无论是位移型还是速度型控制方式,梁端布置形式的减震效果均优于塔梁布置形式;对于相同的布置形式,速度型控制方式较位移型控制方式效果更加显著。
[Abstract]:In order to study the shock absorption effect of the commonly used damping control method in the new structure of high pier multi-tower cable-stayed bridge, a nonlinear finite element dynamic analysis model is established by taking a cable-stayed bridge with a pier height of 178m as an example. The nonlinear time-history analysis of 80 measured seismic waves from the PEER strong earthquake database is carried out, the damage index of each key component is defined according to the characteristics of the structure, and the vulnerability curve of the key component and bridge system is established based on the theory of vulnerability analysis. Taking lead rubber bearings and viscous dampers as the representatives, the effects of displacement and velocity control methods on vibration reduction under different control parameters and layout are studied by comparison of vulnerability curves. According to the actual situation of the bridge, the optimal vibration absorption scheme is determined. The results show that, due to the influence of high piers, the damage probability of main girder and cable in cable-stayed bridge is significantly increased, while the damage of cable tower is relatively slight, due to the difference of force transfer mechanism, The effect of control parameters on the damping effect is different in different layout forms. The damping effect of beam end layout is superior to that of tower and beam layout, regardless of displacement or speed control; for the same layout, The speed control method is more effective than the displacement control mode.
【作者单位】：湖南大学土木工程学院;湖南大学风工程与桥梁工程湖南省重点实验室;
【基金】：国家自然科学基金(51278183)
【分类号】：U442.55;U448.27

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