减震榫对近场高烈度区大跨铁路连续梁桥抗震性能影响分析

The Influence Analysis of Seismic Behavior of Long Span Railway Continuous Beam Bridge with Damping Tenon in Near Field High Intensity Region

为研究减震榫在近场地震下对高墩大跨铁路连续梁桥抗震性能的影响,基于弹塑性力学、材料力学等理论,建立减震榫本构模型与力学性能指标计算方法,以近断层高烈度区某典型高墩大跨非规则连续梁为工程背景,开展典型铁路桥梁抗震性能研究,利用Midas软件建立考虑减震榫的非规则桥梁空间有限元模型,研究减震榫设计参数对大桥地震响应的影响。研究结果表明:在近场地震作用下,减震榫可使大跨连续梁桥墩底内力和墩顶位移的减震率达到35%,能较好地耗散地震能量,有效降低桥墩内力并起到限位作用,减震榫对高墩大跨铁路连续梁桥具有良好的适应性。

In order to study the influence of the damping tenon device on the seismic performance of the continuous beam bridge with high-pier and long-span subject to near-fault earthquake, the constitutive model and mechanical property calculation method of the damping tenon device are proposed based on the theory of elastic-plastic mechanics and material mechanics and so on. Taking a typical high-pier long-span continuous girder bridge in near-fault region as the engineering background, seismic performance analysis of the bridge is carried out, and the finite element model of the long-span bridge with damping tenon is established by Midas software to study the influence of the design parameters of the damping tenon on the seismic performance of the bridge. The calculation analysis results show that, under the effect of near-fault earthquake, the damping tenon could reduce the displacement of the pier top and the internal force of the pier bottom by 35% to well dissipate the seismic energy and effectively reduce the internal force response of the pier, and restrict the displacement. The damping tenon device has good adaptability to railway continuous beam bridge with high-pier and long-span. The results of this study could provide technical support for the seismic fortification of railway continuous beam bridge in the near-fault region.