【作者】 汪俊；

【导师】 肖亚明；

【作者基本信息】 合肥工业大学 ， 结构工程， 2015， 硕士

【摘要】 桁架结构因其具有合理的受力特点、优越的经济性以及优美的外观,在现代体育馆、展览馆、会场、航站楼、车站等建筑中得到广泛的运用,赢得了世界各国建筑工程师的青睐。在遭遇地震时桁架结构时常产生了无法修复的变形、直接破坏或结构整体局部倒塌,究竟原因是结构构件吸收了大量的地震能量,导致结构构件进入弹塑性状态以及出现屈服甚至破坏。传统的抗震结构体系通常是通过不断增强结构本身的性能来提高结构抵御地震作用带来的破坏。阻尼器是一种常见并且用途十分广泛的耗能构件,通过在结构适当的部位和合适的布置方式设置阻尼器,在地震发生时可以防止结构由于吸收大量的地震能量而发生无法修复的大变形和破坏,进而提高了结构的抗震性能。本文研究的是大跨度桁架结构设置粘滞阻尼器的抗震性能分析。本文首先介绍一些常用的结构振动控制方式、耗能减震概念、几种常用阻尼器和有限元软件Sap2000,紧接着介绍了几种阻尼器基本理论和抗震分析方法。本文是以某大型车站的两端大悬挑大跨度桁架结构模型作为分析研究对象。首先采用有限元软件Sap2000建立模型,再用模态分析分析其在无控状态下的固有属性,紧接着对设置阻尼器的桁架结构分别采用时程分析法进行抗震性能分析。在参考已有的大跨度桁架减振资料和多次结构试算结果,最终确定了结构阻尼器的布置方案(布置部位和数量),最终得到了很大的减震效果。以此为基础,调整影响耗能减震效果最明显的几个阻尼器参数进行对比分析并且择优选择。最终得出两端大悬挑大跨度桁架结构在设置粘滞阻尼器时抗震耗能性能十分突出。为今后的类似设计和深层次的研究提供了经验。更多还原

【Abstract】 Truss structure because of its reasonable mechanical characteristics, superior economic and beautiful appearance, the modern gymnasium, exhibition hall, hall, terminals, stations, has been widely used in the building, won the favor of the construction engineer all over the world. In a truss structure are often produced during the earthquake of irreparable deformation, direct damage or partial collapse structure as a whole, what reason is structures absorb a large amount of seismic energy, lead to yield structures into the elastic-plastic state and even damage. Traditional anti-seismic structure is usually through strengthening structure itself to improve the performance of structures to resist earthquake damage. Damper is a common and very versatile wall-beam, through the appropriate place and proper arrangement in structure, set the damper in at the time of the earthquake can prevent structure due to absorb a large number of seismic energy unable to repair large deformation and failure, and improves the seismic performance of structures. This paper studies the large-span truss structure set seismic performance analysis of viscous dampers.This paper first introduces some commonly used way of structural vibration control, damping energy consumption concept, several common damper and the finite element software Sap2000, and then introduces the basic theory and several kinds of damper seismic analysis method. This article is based on a large station at both ends of the large cantilever large-span truss structure model as the research object. Model is firstly established by finite element software Sap2000, the modal analysis under no control analysis of the inherent attributes, and then to set the damper of truss structure time history analysis method is adopted to improve the seismic performance analysis respectively. In reference to the existing structure of large span truss vibration data and multiple trial results, ultimately determines the structure of the damper layout (quantity and arrangement of parts),finally got a big shock absorption effect. On this basis, adjust the impact energy dissipation damping effect is one of the most obvious damper parameters were analyzed and the optimal choice. Finally concluded on both ends of the large cantilever large-span truss structure in the viscous damper is set up when the seismic energy dissipation performance is very outstanding. For the future similar design and deep research provides experience.更多还原