【摘要】：為防止滑動摩擦隔震橋梁位移過大對臨跨造成不利的影響,可在橋墩上設(shè)置限位裝置限制墩梁相對滑動位移,降低滑動摩擦隔震橋梁的縱向位移。本文提出了滑動摩擦隔震支座和限位裝置同時使用的抗震構(gòu)造措施,利用滑動摩擦隔震支座降低固定墩的地震反應(yīng),利用限位裝置降低墩梁相對滑動位移。建立了同時考慮支座滑動摩擦非線性、限位裝置接觸碰撞及其材料非線性和橋墩材料非線性的橋梁結(jié)構(gòu)非線性地震反應(yīng)分析模型,改變活動支座摩擦系數(shù)、限位裝置與梁體之間的碰撞初始間隙等參數(shù),進行了非線性時程反應(yīng)分析,針對限位裝置對滑動摩擦隔震橋梁的非線性地震反應(yīng)的影響進行了綜合分析。研究表明,限位裝置對于限制滑動摩擦隔震橋梁的梁部位移、均衡地震動輸入能量在各墩之間的分配有著較大的作用。設(shè)計時可通過詳細的有限元分析,改變限位裝置的間距、剛度等設(shè)計參數(shù),使限位裝置起到降低滑動摩擦隔震橋梁的縱向位移而不顯著增加固定墩地震反應(yīng)的作用。
[Abstract]:In order to prevent the excessive displacement of sliding friction-isolated bridge from adversely affecting the impending span, a limit device can be set up on the pier to limit the relative sliding displacement of the pier beam and reduce the longitudinal displacement of the sliding friction-isolated bridge. In this paper, the seismic structural measures of sliding friction isolation support and limit device are proposed. The sliding friction isolation support can reduce the seismic response of fixed pier and the relative sliding displacement of pier beam will be reduced by using limit device. The nonlinear seismic response analysis model of bridge structure considering the nonlinear sliding friction of the bearing, the contact collision of the limiter and the material nonlinearity of the pier are established to change the friction coefficient of the movable bearing. The nonlinear time-history response analysis of the initial clearance of the collision between the limiting device and the beam is carried out, and the influence of the limiting device on the nonlinear seismic response of the sliding friction-isolated bridge is comprehensively analyzed. The results show that the location-limiting device plays an important role in limiting the beam movement of sliding friction-isolated bridges and balancing the distribution of input energy of ground motion among the piers. By means of detailed finite element analysis, the design parameters such as spacing and stiffness of limit devices can be changed to reduce the longitudinal displacement of sliding friction isolated bridges without significantly increasing the seismic response of fixed piers.
【作者單位】： 煙臺大學(xué)土木工程學(xué)院;蘭州交通大學(xué)土木工程學(xué)院;
【基金】：國家自然科學(xué)基金項目(51108220,51068017) 長江學(xué)者和創(chuàng)新團隊發(fā)展計劃資助(IRT1139)
【分類號】：U442.55

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本文編號：2217324