多跨连续梁桥LRB与FVD组合应用减隔震效果分析

发布时间：2018-03-24 02:07

本文选题：多跨连续梁桥　切入点：减隔震　出处：《中南大学》2014年硕士论文

【摘要】：多跨连续梁桥纵、横向地震响应具有一定的差异,使用一种减隔震装置难以达到水平两个方向同时减隔震的目的。铅芯橡胶支座在蠕变荷载作用下水平抗力很小,而在地震强烈动荷载作用下屈服后刚度迅速降低,同时支座滞回耗散地震能量；液体粘滞阻尼器是速度相关型耗能装置,提供构件强大的恢复力,具有良好的限位功能。将两者共同使用,可以有效的同时控制多跨连续梁桥水平两个方向的地震响应。基于这种思路,本文以某高速多跨连续梁桥为工程背景,主要完成了以下工作： 1、结合对桥梁抗震设计、计算方法的回顾、对比,阐述了铅芯橡胶支座以及液体粘滞阻尼器的减隔震原理、力学性能、适用情况以及计算中的实现方法。 2、利用有限元分析软件ANSYS建立了某高速五跨连续梁桥的分析模型,并对其进行了动力特性分析。 3、利用动力时程分析方法,对铅芯橡胶支座以及液体粘滞阻尼器的减隔震效果进行探讨,并对铅芯橡胶支座的设计参数对多跨连续梁桥减隔震效果的影响进行了分析。 4、运用基于能量的分析方法,探讨了铅芯橡胶支座以及液体粘滞阻尼器对多跨连续梁桥桥墩地震动输入能的影响,并推到了一种基于能量方法的桥墩地震安全系数。 5、利用多跨连续梁桥减隔震效果模拟试验,验证了LRB与FVD组合应用减隔震效果的可行性。
[Abstract]:The longitudinal and lateral seismic responses of multi-span continuous beam bridges are different, so it is difficult to achieve the aim of both horizontal direction and simultaneous isolation by using a kind of isolation device. The horizontal resistance of lead rubber bearing is very small under creep load. The stiffness decreases rapidly after yielding under strong earthquake dynamic load, and the support hysteresis dissipates the seismic energy, and the liquid viscous damper is a speed dependent energy dissipation device, which provides a strong restoring force of the component. It can effectively control the seismic response of multi-span continuous beam bridge in horizontal and two directions simultaneously. Based on this idea, a high-speed multi-span continuous beam bridge is used as the engineering background in this paper. The following tasks have been completed:. 1. According to the retrospect of the seismic design and calculation method of the bridge, the principle, mechanical performance, application and realization method of the lead-rubber bearing and liquid viscous damper are expounded. 2. The analysis model of a high-speed five-span continuous beam bridge is established by using the finite element analysis software ANSYS, and its dynamic characteristics are analyzed. 3. Using dynamic time history analysis method, the seismic isolation effect of lead rubber bearing and liquid viscous damper is discussed, and the influence of design parameters of lead rubber bearing on the seismic isolation effect of multi-span continuous beam bridge is analyzed. 4. The influence of lead rubber bearing and liquid viscous damper on the input energy of ground motion of piers of multi-span continuous girder bridge is discussed by using the energy-based analysis method, and the seismic safety factor of the pier based on the energy method is deduced. 5. The feasibility of the application of LRB and FVD is verified by using the simulation test of seismic isolation effect of multi-span continuous beam bridge.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55

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