防屈曲耗能支撑在框架结构中的耗能减震分析

发布时间：2018-11-11 20:32

【摘要】：框架结构和框架-支撑结构在高层建筑中应用非常广泛。纯框架结构的抗侧刚度有限，在地震和强风荷载作用下，侧向位移较大，限制了它的应用高度。框架支撑结构在某种程度上提高了结构的抗侧刚度，但其在强震作用下易产生受压屈曲，极易导致支撑自身或连接的失效甚至破坏。同时支撑屈服后很难有效耗能，降低了结构的抗震能力。目前发展起来的防屈曲耗能支撑有效解决了普通受压屈曲的问题。本文在一定的理论研究和试验的基础上，研究防屈曲耗能支撑在实际工程中的应用和可行性。本文主要从以下几个方面研究： 1）首先以河南省新乡市某九层框架结构为例，运用有限元分析软件SAP2000，对原框架结构、框架加普通支撑结构及框架加防屈曲耗能支撑结构进行振型分解反应谱分析及线性时程分析，对比三种结构体系的周期、层间位移、基底剪力及支撑轴力等地震响应，绘制出防屈曲耗能支撑在小震、中震、大震下的滞回曲线。结果表明，小震下防屈曲耗能支撑具有与普通支撑基本一致的抗震性能；在中震及大震下，防屈曲耗能支撑进入工作耗能，通过滞回耗散地震能量，耗能减震效果明显。 2）在明确了防屈曲耗能支撑的优势之后，本文以西安市某五层框架结构为例，通过D值法计算出结构的抗侧刚度，在给定目标位移的前提下，根据支撑刚度与框架抗侧刚度比λ计算出防屈曲耗能支撑面积。并对防屈曲耗能支撑多种布置方案进行罕遇地震下的静力弹塑性分析，通过对比各种方案下塑性铰的发展情况及地震响应（周期、层间位移、基底剪力等）得出在支撑面积一定的情况下何种布置方案最佳。以其中两种方案为例，通过得出的基底剪力-顶点位移曲线、性能点、层间位移角推覆过程进一步说明防屈曲耗能支撑能够在罕遇地震下有更充足的安全储备。 3）在讨论了防屈曲耗能支撑的优化布置后，本文以一变更工程（设防烈度提高）为例，，在原构件截面尺寸、构件配筋不变的前提下，通过增设防屈曲耗能支撑，得到规范限值内的地震响应。由此说明防屈曲耗能支撑在抗震加固或设计变更工程中有非常好的应用价值。
[Abstract]:Frame structure and frame-braced structure are widely used in high-rise buildings. The lateral stiffness of the pure frame structure is limited, and the lateral displacement is larger under earthquake and strong wind loads, which limits its application height. The frame braced structure improves the lateral stiffness of the structure to some extent, but it is easy to produce compression buckling under the action of strong earthquake, which easily leads to the failure and even failure of the bracing itself or connection. At the same time, it is difficult to consume energy effectively after bracing yield, which reduces the seismic capacity of the structure. The current development of anti-buckling energy dissipation braces effectively solves the problem of general compression buckling. On the basis of theoretical research and experiment, this paper studies the application and feasibility of anti-buckling energy dissipation support in practical engineering. This paper mainly studies from the following aspects: 1) take a nine-story frame structure in Xinxiang City, Henan Province as an example, and use the finite element analysis software SAP2000, to analyze the original frame structure. The vibration mode decomposition response spectrum analysis and linear time history analysis of frame and general braced structure and frame structure with anti-buckling energy dissipation bracing are carried out, and the seismic responses of the three structural systems, such as period, interstory displacement, base shear force and bracing axial force, are compared. The hysteretic curves of anti-buckling energy dissipation support under small, moderate and large earthquakes are drawn. The results show that the anti-buckling energy dissipation braces have the same seismic performance as the common braces under small earthquakes, and under moderate and strong earthquakes, the anti-buckling energy dissipation braces enter into the work energy consumption, and the energy dissipation effect is obvious through the hysteretic dissipation of seismic energy. 2) after defining the advantages of anti-buckling and energy-dissipation bracing, taking a five-story frame structure in Xi'an as an example, the lateral stiffness of the structure is calculated by D value method, and the displacement of the target is given. According to the ratio of bracing stiffness to lateral stiffness of frame, the area of anti-buckling energy dissipation bracing is calculated. The static elastic-plastic analysis of various arrangement schemes of anti-buckling energy dissipation bracing is carried out under rare earthquake. By comparing the development of plastic hinge and seismic response (period, interstory displacement) under various schemes, Base shear, etc.) to get the best arrangement under the condition of certain supporting area. Taking two schemes as an example, the shear-vertex displacement curve, the performance point and the interstory displacement angle push-over process obtained further show that the anti-buckling energy dissipation braces have more sufficient safety reserves under rare earthquakes. 3) after discussing the optimal arrangement of the anti-buckling energy dissipation braces, this paper takes a change engineering (increasing the fortification intensity) as an example, under the premise of the original member section size and the reinforcement constant, by adding the anti-buckling energy dissipation bracing. The seismic response within the specified limit is obtained. It shows that the buckling-proof energy dissipation braces have very good application value in seismic reinforcement or design change engineering.
【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】：TU973.31

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