板式橡胶支座与粘滞阻尼器在斜拉桥中组合使用的减震性能数值模拟研究

发布时间：2018-01-07 16:01

本文关键词：板式橡胶支座与粘滞阻尼器在斜拉桥中组合使用的减震性能数值模拟研究　出处：《辽宁工程技术大学》2015年硕士论文　论文类型：学位论文

【摘要】：近年来,地震对世界各国造成了重大损失,结构减隔震装置的研究也引起越来越多学者的重视。本文以某城市组合体系斜拉桥为背景,用SAP2000软件建立结构的有限元模型,首先对该斜拉桥进行模态分析,求得该斜拉桥的自振频率及振型,然后进行反应谱分析和时程分析,求得该斜拉桥在地震作用下的地震响应。通过比较该组合体系斜拉桥减隔震前后的地震响应,分析了粘滞阻尼器与板式橡胶支座联合使用时的减震效果,为今后大跨度斜拉桥的减隔震设计提供参考,为粘滞阻尼器与板式橡胶支座的联合使用提供依据。本文研究得出的结论有：1.粘滞阻尼器只增加结构阻尼,不增加结构的刚度。只考虑顺桥向地震动作用的情况下,结构的竖向和顺桥向向地震响应较大,而横桥向地震响应很小。2.反应谱分析的计算结果比时程分析的大,时程分析的结果为反应谱分析结果的0.8-1.1倍,因此在抗震设计中应该合理的选择分析方法,可采用反应谱方法进行保守设计,用时程分析的结果进行校核。当结构单独采用板式橡胶支座时,结构由于缺少减隔震装置导致地震响应量较大,而板式橡胶支座与粘滞阻尼器联合使用,阻尼器有效地吸收了地震能量,结构的位移响应和内力响应都显著降低。3.当保持支座刚度不变时,塔顶位移和塔顶弯矩随阻尼系数的增加而减小,当达到一定程度时,塔顶位移和塔底弯矩达到最小值,若继续增加阻尼器的阻尼系数,塔顶位移和塔顶弯矩反而有上升趋势。因此在实际工程中,在考虑成本的情况下为了使桥梁的抗震效果达到最佳,隔震装置必须先进行参数优化设计。
[Abstract]:In recent years, the earthquake caused a great loss to the world, study the structure of seismic isolation devices have attracted more and more attention of scholars. This paper takes a combination of city cable-stayed bridge as the background, the establishment of the finite element model of the structure with SAP2000 software, firstly, the modal analysis of the cable-stayed bridge, the vibration frequency and the vibration of the cable-stayed bridge, and then the response spectrum analysis and time history analysis, the results of the cable-stayed bridge under earthquake seismic response. By comparing the isolation before and after the earthquake response of composite cable-stayed bridge, analysis of damping effect of the combined use of viscous dampers and plate type rubber bearing the reference for the future seismic design of long-span cable-stayed bridge, provide the basis for the combined use of viscous dampers and rubber bearing. The conclusions of this paper are: 1. viscous dampers only increase the damping of structure without increasing structure The stiffness along the bridge. Only considering seismic conditions, vertical and bridge structure to seismic response is larger, and the transverse seismic response of small.2. response spectrum analysis of the calculation results of time history analysis of large, 0.8-1.1 times the results of time history analysis for response spectrum analysis results, so in the seismic design should be reasonable selection of analysis method can be designed by response spectrum method is conservative, with the results of time history analysis. When the structure is checked individually by using rubber bearing structure, due to the lack of seismic isolation devices leads to the seismic response of a large amount, and the laminated rubber bearings and viscous damper with damper can effectively absorb seismic energy response, displacement and internal force were significantly decreased.3. while maintaining the support stiffness constant, the top displacement and the bending moment decreases with the increase of the damping coefficient, when reaching a certain range Degrees, the top displacement and the bending moment at the bottom of the tower reaches the minimum value, if continue to increase the damping coefficient, the top displacement and the bending moment has a rising trend. Therefore, in practical engineering, in considering the cost of the case in order to achieve the best effect of the bridge seismic isolation device, must carry on the parameter optimization design.

【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55;U448.27

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