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以一幢抗震性能未满足抗震规范的4层钢筋混凝土框架结构为算例,对其采用增设防屈曲耗能支撑的方法进行抗震加固,并对原有结构及加固后结构进行了小震、中震下反应谱及地震波时程的抗震效果对比分析。分析结果表明,防屈曲耗能支撑能够有效地提高结构的抗震性能。在小震作用下,防屈曲耗能支撑处于弹性状态,为结构提供抗侧刚度;在中震作用下,防屈曲耗能支撑逐渐进入非线性状态,作为结构第一道防线消耗地震能量。
Taking a four-story reinforced concrete frame structure with seismic performance not meeting the seismic code as an example, seismic strengthening was carried out by adding buckling-proof energy dissipation support. The original structure and the reinforced structure were subjected to a small earthquake Seismic Response Analysis of Seismic Response Spectrum and Seismic Wave Duration. The analysis results show that the anti-buckling energy dissipation support can effectively improve the seismic performance of the structure. Under the action of minor earthquakes, the buckling-proof energy dissipation brace is in the elastic state, which provides the structure with lateral stiffness. Under the action of the mid-earthquake, the buckling-resistant energy dissipation brace gradually enters into the nonlinear state, which consumes the seismic energy as the first defense line of the structure.