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结构在地震作用下的振动是结构各阶模态共同参与的结果。该文在已有研究基础上发展了考虑结构模态侧向力组合的静力弹塑性分析方法。采用模态贡献修正系数作为各阶模态参与的权重,考虑模态侧向力的方向,构造了基于模态侧向力组合的推覆分析侧向力模式,将各侧力模式分析结果的包络值作为结构的抗震响应。以两个5层和12层的钢筋混凝土框架结构为例,研究了结构的能力曲线和目标位移处的楼层变形分布;分别采用能量方法和非弹性响应谱来构造结构的能力曲线和需求曲线,对比分析了结构的层间位移角和楼层侧向位移。结果表明:结构的能力曲线由四种组合侧力模式共同决定,性能点处的抗震响应由两种组合侧力模式控制;该文方法能较好的预测结构的抗震响应,比常规的侧向力模式精度更高。
The vibration of the structure under the action of earthquake is the result of the common participation of all modes of the structure. Based on the existing research, this paper develops the static elasto-plastic analysis method considering the combination of lateral force of structural modal. Using modal contribution correction coefficient as the weight of each modal participation and considering the direction of modal lateral force, a pushover analysis lateral force mode based on modal lateral force combination is constructed. The results of the analysis of each lateral force mode Envelope value as a structural seismic response. Taking the two 5-story and 12-story RC frames as an example, the deformation curves of the structure and the floor deformation at the target displacement are studied. The energy curves and the demand curves of the structure are constructed by energy method and inelastic response spectrum respectively. The layer displacement angle and floor lateral displacement of the structure are compared and analyzed. The results show that the capacity curve of the structure is jointly determined by the four combined lateral force modes, and the seismic response at the performance point is controlled by two combined lateral force modes. The proposed method can better predict the seismic response of the structure than the conventional lateral Force mode accuracy is higher.