三维隔震连续梁桥近断层地震响应数值分析
发布时间：2019-02-16 13:23
【摘要】：以一座多跨连续梁桥为研究对象,根据水平和竖向预期隔震目标,计算确定了三维隔震支座相关力学参数。建立了三维隔震连续梁桥数值仿真模型,通过时程反应分析和数值仿真分析三维隔震多跨连续梁桥的地震反应,验证了三维隔震支座的水平和竖向隔震效果。研究结果表明,作者所提出的三维隔震支座具有适宜的水平和竖向隔震力学刚度和耗能能力。在近断层三维地震动作用下桥墩弯矩隔震效果达60%~70%,近断层脉冲型地震动会造成隔震支座过大的水平剪切变形,进而造成上部结构水平碰撞甚至支座剪切破坏。跨中竖向地震反应隔震效果达20%~40%,菱形钢板阻尼器的应用显著改善了组合碟形弹簧的竖向隔震效果。三维隔震技术是减轻桥梁结构多维地震动反应的有效途径之一,但脉冲型地震动作用可能会降低三维隔震支座的隔震效果,其影响程度和主要影响因素需进一步深入研究。
[Abstract]:Taking a multi-span continuous beam bridge as the research object, the mechanical parameters related to the three-dimensional isolation support are calculated and determined according to the horizontal and vertical expected seismic isolation targets. The numerical simulation model of 3D isolated continuous beam bridge is established. The horizontal and vertical isolation effects of the three dimensional isolation bearing are verified by the time history response analysis and the numerical simulation analysis of the seismic response of the three dimensional multi-span continuous beam bridge. The results show that the three dimensional isolation bearing proposed by the author has the appropriate mechanical stiffness and energy dissipation capacity of horizontal and vertical isolation. Under the action of three dimensional ground motion near the fault, the moment isolation effect of bridge piers reaches 6070. The near-fault impulse ground motion will cause excessive horizontal shear deformation of the isolation support, and then lead to horizontal collision of the superstructure and even shear failure of the support. The isolation effect of vertical seismic response in span is 20 and 400.The application of diamond-shaped steel plate damper has improved the vertical isolation effect of composite disc spring. Three-dimensional seismic isolation technology is one of the effective ways to reduce the multi-dimensional ground motion response of bridge structure, but the effect of impulse ground motion may reduce the isolation effect of three-dimensional isolation bearing, and its influence degree and main influencing factors need to be further studied.
【作者单位】： 北京工业大学城市与工程安全减灾教育部重点实验室;北京城市交通协同创新中心;
【基金】：国家自然科学基金资助项目(51208015) 教育部高等学校博士学科点专项科研基金资助项目(20121103120022)
【分类号】：U448.215;U442.55
[Abstract]:Taking a multi-span continuous beam bridge as the research object, the mechanical parameters related to the three-dimensional isolation support are calculated and determined according to the horizontal and vertical expected seismic isolation targets. The numerical simulation model of 3D isolated continuous beam bridge is established. The horizontal and vertical isolation effects of the three dimensional isolation bearing are verified by the time history response analysis and the numerical simulation analysis of the seismic response of the three dimensional multi-span continuous beam bridge. The results show that the three dimensional isolation bearing proposed by the author has the appropriate mechanical stiffness and energy dissipation capacity of horizontal and vertical isolation. Under the action of three dimensional ground motion near the fault, the moment isolation effect of bridge piers reaches 6070. The near-fault impulse ground motion will cause excessive horizontal shear deformation of the isolation support, and then lead to horizontal collision of the superstructure and even shear failure of the support. The isolation effect of vertical seismic response in span is 20 and 400.The application of diamond-shaped steel plate damper has improved the vertical isolation effect of composite disc spring. Three-dimensional seismic isolation technology is one of the effective ways to reduce the multi-dimensional ground motion response of bridge structure, but the effect of impulse ground motion may reduce the isolation effect of three-dimensional isolation bearing, and its influence degree and main influencing factors need to be further studied.
【作者单位】： 北京工业大学城市与工程安全减灾教育部重点实验室;北京城市交通协同创新中心;
【基金】：国家自然科学基金资助项目(51208015) 教育部高等学校博士学科点专项科研基金资助项目(20121103120022)
【分类号】：U448.215;U442.55
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