混合布置阻尼器的建筑抗震性能研究

发布时间：2018-05-26 17:07

本文选题：防屈曲支撑 + 粘滞阻尼器　；参考：《天津大学》2014年硕士论文

【摘要】：我国是世界上地震活动最为频繁的国家之一,长期以来地震给我国带来了巨大的灾难,所以在我国提高抗震能力,促进消能减震技术的发展显得尤为重要。随着我国经济的发展,城市化进程中高层、超高层建筑的不断涌现,高层减震技术的研究有其必要性和紧迫性。本文通过查阅大量文献,总结了粘滞阻尼器、防屈曲支撑、混合阻尼器在国内外的一些试验研究以及实际工程的应用。介绍了阻尼器的类型及减震原理,探讨了阻尼器附加阻尼比的求解方法及减震结构的分析方法,同时对防屈曲支撑和粘滞阻尼器混合使用时的设计方法提出了一些建议。以某实际工程为研究背景,使用SAP2000软件建立结构模型进行分析,以研究防屈曲支撑和粘滞阻尼器混合使用时的减震性能。同时对混合阻尼器在结构水平方向和竖直方向的布置进行探讨。本文主要可得如下结论:(1)对于粘滞阻尼器和防屈曲支撑混合使用的减震结构,在多遇地震下,防屈曲支撑可设计成弹性状态,粘滞阻尼器处于耗能状态,通过设置等刚度的普通支撑模拟防屈曲支撑,同时通过对结构模型阻尼比参数的调整来考虑粘滞阻尼器的贡献,从而可以直接使用振型分解反应谱法对混合阻尼器结构进行计算分析。(2)混合阻尼器可以很好的减小结构的层间位移,在多遇地震下,结构X向和Y向的最大层间位移分别减小42%和49%,在罕遇地震下,结构X向和Y向的最大层间位移分别减小39.1%和40%。混合阻尼器对结构的基底剪力有良好的控制效果,在多遇地震下,结构X向基底剪力增加5.6%,Y向基底剪力减小3%,在罕遇地震下,结构X向和Y向的基底剪力分别减小8.4%和4%。(3)通过对阻尼器实际工程应用和减震性能研究的基础上可得:混合阻尼器可实现对结构刚度调节和附加阻尼的灵活控制,为结构设计提供了新的抗震设计思路,可以优化结构构件的截面尺寸,降低结构的配筋量。(4)混合阻尼器水平方向布置分析表明:将防屈曲支撑布置在结构外侧,粘滞阻尼器布置在结构内侧时,对结构层间位移和基底剪力的影响不大,同时可以很好的提高结构的抗扭能力,有效减少结构的破坏。(5)混合阻尼器竖向布置分析表明:对结构的下部楼层布置防屈曲支撑可调节结构刚度,上部楼层布置粘滞阻尼器可发挥速度型阻尼器的耗能特性,更好的减小结构的层间位移,提高结构的抗扭性能,有效减少结构下部楼层框架柱的破坏。
[Abstract]:China is one of the countries with the most frequent seismicity in the world. Earthquake has brought great disaster to our country for a long time, so it is very important to improve the seismic capacity and promote the development of energy dissipation and seismic absorption technology in our country. With the development of our economy and the continuous emergence of high-rise buildings in the process of urbanization, it is necessary and urgent to study the technology of high-rise seismic absorption. In this paper, some experimental studies and practical engineering applications of viscous dampers, buckling braces and hybrid dampers are summarized by consulting a large number of literatures. This paper introduces the type and principle of dampers, discusses the method of solving the additional damping ratio of dampers and the analysis method of dampers, and puts forward some suggestions for the design of anti-buckling braces and viscous dampers. On the background of a practical project, a structural model was established by using SAP2000 software to study the seismic absorption performance of buckling braces and viscous dampers. At the same time, the arrangement of hybrid dampers in horizontal and vertical direction is discussed. In this paper, the main conclusions are as follows: (1) for the damping structures with viscous dampers and anti-buckling braces, the anti-buckling braces can be designed as elastic state and the viscous dampers are in the energy dissipation state under frequent earthquakes. The contribution of viscous dampers is considered by adjusting the damping ratio parameters of the structure model by setting the common braces with equal stiffness to simulate the buckling braces. Therefore, the modal decomposition response spectrum method can be directly used to calculate and analyze the hybrid dampers. The maximum interstory displacements in X and Y directions are reduced by 42% and 49%, respectively. Under rare earthquakes, the maximum interstory displacements in X and Y directions are reduced by 39. 1% and 40%, respectively. Hybrid dampers have a good control effect on the base shear force of the structure. Under frequent earthquakes, the X direction base shear force increases by 5.6% and the Y direction base shear force decreases by 3 parts, and under rare earthquakes, the X direction base shear force decreases by 3 parts. On the basis of the practical engineering application of the damper and the study of the damping performance, it can be obtained that the hybrid damper can realize the flexible control of the stiffness adjustment and the additional damping of the structure, and reduce the base shear force of the structure in the direction of X and Y by 8.4% and 4% respectively. This paper provides a new seismic design idea for structural design, which can optimize the section size of structural members and reduce the reinforcement of the structure. The analysis of horizontal direction arrangement of hybrid dampers shows that the buckle-resistant braces are arranged on the outside of the structure. When the viscous dampers are arranged on the inner side of the structure, there is little effect on the displacement between the layers and the shear force of the base, and the torsional resistance of the structure can be improved very well at the same time. The analysis of vertical arrangement of hybrid dampers shows that the stiffness of the structure can be adjusted by the arrangement of anti-buckling braces on the lower floors of the structure, and the energy dissipation characteristics of the speed dampers can be played by the viscous dampers in the upper floors. The floor displacement of the structure is reduced better, the torsional resistance of the structure is improved, and the failure of the frame column on the lower floor of the structure is effectively reduced.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU352.11

【参考文献】