基础隔震、层间耗能支撑及两者联合使用时抗震性能分析

发布时间：2018-10-23 07:24

【摘要】：在结构减震控制领域中基础隔震技术是减震效果最为理想的一种方法，结构的周期由于增设了隔震装置而得到延长，使上部结构在地震时受到地面运动的影响减小。传统抗震结构体系与隔震结构体系的耗能原理有所不同，隔震结构体系中的地震能量是通过设置在隔震层的耗能设备来耗散，而不是靠结构自身或自身构件的塑性变形耗散，在耗能方面隔震结构体系显示出很大的优越性。防屈曲耗能支撑是一种新型支撑构件，其作用与普通支撑类似，，不同之处是当防屈曲耗能支撑受到反复荷载作用时，构件可以达到屈服但并不会屈曲，因此防屈曲耗能支撑在实际应用中无论处于受拉状态还是处于受压状态，全截面均可达到屈服。当结构遭遇强震作用时，大部分的地震能量可通过构件的滞回耗散，从而避免了主体结构的破坏。本文开篇便对防屈曲耗能支撑和基础隔震技术的发展历史、现状、优势及劣势和在工程中的实际应用做了介绍，并在原理上对防屈曲耗能支撑和基础隔震技术进行了阐述。其次运用有限元软件Midas/Gen对高层混凝土框架、增设防屈曲耗能支撑的混凝土框架、基础隔震框架以及防屈曲耗能支撑与基础隔震技术联合应用的混凝土框架，这四种方案分别在弹性阶段和弹塑性阶段进行时程分析，在以下几个方面对比原结构和其余三种方案的减震耗能性能。（1）最大层间位移角，（2）顶层最大水平位移时程曲线，（3）顶层节点最大加速度时程曲线，（4）隔震支座和防屈曲耗能支撑的滞回耗能性能等。研究结果表明：当结构遭遇中震或大震作用时，隔震支座或耗能支撑开始产生滞回变形耗散输入结构中的地震能量，减震效果十分明显。本论文的科研成果可以作为实际工程应用和类似结构体系研究的参考。
[Abstract]:In the field of structural shock absorption and control, the base isolation technique is the most ideal method for seismic absorption. The period of the structure is prolonged because of the addition of the isolation device, which reduces the influence of the ground motion on the superstructure during the earthquake. The energy dissipation principle of the traditional seismic structure system is different from that of the isolated structure system. The seismic energy in the isolated structure system is dissipated by the energy dissipation equipment installed in the isolation layer, not by the plastic deformation dissipation of the structure itself or its own members. The isolated structure system has shown great superiority in energy dissipation. The anti-buckling energy-dissipation bracing is a new type of bracing member whose function is similar to that of common bracing. The difference is that when the anti-buckling energy dissipation bracing is subjected to repeated loads, the member can yield but not buckle. Therefore, in practical application, the full section of the anti-buckling energy dissipation bracing can reach yield whether it is in the state of tension or in the state of compression. When the structure is subjected to strong earthquake, most of the seismic energy can be dissipated through the hysteresis of the member, thus avoiding the destruction of the main structure. At the beginning of this paper, the development history, present situation, advantages and disadvantages and practical application in engineering of anti-buckling energy dissipation support and foundation isolation technology are introduced, and the anti-buckling energy dissipation support and foundation isolation technology are expounded in principle. Secondly, the finite element software Midas/Gen is applied to the high-rise concrete frame, the concrete frame with anti-buckling and energy-dissipation bracing, the base isolation frame and the concrete frame with the combination of anti-buckling energy dissipation bracing and foundation isolation technology are added. The four schemes are analyzed in the elastic stage and the elastic-plastic stage, respectively. The energy dissipation performance of the original structure and the other three schemes are compared in the following aspects. (1) maximum interstory displacement angle, (2) maximum horizontal displacement time history curve of the top floor, (3) maximum acceleration time history curve of the top floor joint, (4) isolation support and anti-buckling Hysteretic energy dissipation performance of energy dissipation support, etc. The results show that when the structure is subjected to moderate or large earthquakes, the isolation support or energy dissipation support begins to produce seismic energy dissipation in the hysteretic deformation input structure, and the effect of seismic absorption is very obvious. The research results of this paper can be used as a reference for practical engineering applications and similar structural systems research.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU352.1

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