限位装置对滑动摩擦隔震桥梁地震反应的影响研究
发布时间：2018-09-01 13:19
【摘要】：为防止滑动摩擦隔震桥梁位移过大对临跨造成不利的影响,可在桥墩上设置限位装置限制墩梁相对滑动位移,降低滑动摩擦隔震桥梁的纵向位移。本文提出了滑动摩擦隔震支座和限位装置同时使用的抗震构造措施,利用滑动摩擦隔震支座降低固定墩的地震反应,利用限位装置降低墩梁相对滑动位移。建立了同时考虑支座滑动摩擦非线性、限位装置接触碰撞及其材料非线性和桥墩材料非线性的桥梁结构非线性地震反应分析模型,改变活动支座摩擦系数、限位装置与梁体之间的碰撞初始间隙等参数,进行了非线性时程反应分析,针对限位装置对滑动摩擦隔震桥梁的非线性地震反应的影响进行了综合分析。研究表明,限位装置对于限制滑动摩擦隔震桥梁的梁部位移、均衡地震动输入能量在各墩之间的分配有着较大的作用。设计时可通过详细的有限元分析,改变限位装置的间距、刚度等设计参数,使限位装置起到降低滑动摩擦隔震桥梁的纵向位移而不显著增加固定墩地震反应的作用。
[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.
【作者单位】： 烟台大学土木工程学院;兰州交通大学土木工程学院;
【基金】：国家自然科学基金项目(51108220,51068017) 长江学者和创新团队发展计划资助(IRT1139)
【分类号】：U442.55
[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.
【作者单位】： 烟台大学土木工程学院;兰州交通大学土木工程学院;
【基金】：国家自然科学基金项目(51108220,51068017) 长江学者和创新团队发展计划资助(IRT1139)
【分类号】：U442.55
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