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探讨了把首层架空框架结构简化为单质点模型的条件,对工程中常见的首层架空多层钢筋混凝土框架结构的简化条件进行了分析,指出当结构高宽比较小时,可简化成一个单层框架模型。根据单层框架模型,利用结构延性需求、等效阻尼比、地震加速度反应谱得到架空层的层间需求曲线(V-u曲线),作为架空层抗地震倒塌设计的依据。通过结构在罕遇地震下的倒塌率计算,验证了文中方法的可靠性。
The conditions for simplifying the overhead structure of the first floor to a single mass point model are discussed. The simplified conditions of the first overhead overhead multi-story reinforced concrete frame structure are analyzed. It is pointed out that when the height-width ratio of the structure is small, it can be simplified into a single Layer frame model. According to the single-layer frame model, the interlayer demand curve (V-u curve) of the overhead layer is obtained by using the structural ductility demand, equivalent damping ratio and seismic acceleration response spectrum as the basis for the anti-seismic collapse design of the overhead layer. Through the calculation of the collapse rate of the structure under the rare earthquake, the reliability of the proposed method is verified.