【摘要】：以一座多跨連續(xù)梁橋為研究對象,根據(jù)水平和豎向預期隔震目標,計算確定了三維隔震支座相關力學參數(shù)。建立了三維隔震連續(xù)梁橋數(shù)值仿真模型,通過時程反應分析和數(shù)值仿真分析三維隔震多跨連續(xù)梁橋的地震反應,驗證了三維隔震支座的水平和豎向隔震效果。研究結果表明,作者所提出的三維隔震支座具有適宜的水平和豎向隔震力學剛度和耗能能力。在近斷層三維地震動作用下橋墩彎矩隔震效果達60%~70%,近斷層脈沖型地震動會造成隔震支座過大的水平剪切變形,進而造成上部結構水平碰撞甚至支座剪切破壞。跨中豎向地震反應隔震效果達20%~40%,菱形鋼板阻尼器的應用顯著改善了組合碟形彈簧的豎向隔震效果。三維隔震技術是減輕橋梁結構多維地震動反應的有效途徑之一,但脈沖型地震動作用可能會降低三維隔震支座的隔震效果,其影響程度和主要影響因素需進一步深入研究。
[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.
【作者單位】： 北京工業(yè)大學城市與工程安全減災教育部重點實驗室;北京城市交通協(xié)同創(chuàng)新中心;
【基金】：國家自然科學基金資助項目(51208015) 教育部高等學校博士學科點專項科研基金資助項目(20121103120022)
【分類號】：U448.215;U442.55

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本文編號：2424492