【摘要】 基于强震下摩擦耗能钢框架的能量转化机制,发展了一种结构基于性能刚塑性抗震设计方法。将预设的耗能部位(梁柱塑性铰及摩擦耗能元件)假定为理想刚塑性,其它部位为刚性,采用刚塑性模型来预测结构地震反应。以预控的塑性机构及位移限值作为性能目标,考虑结构的P-Δ效应,根据能量相等原则,将结构等效为刚塑性单自由度体系,运用刚塑性位移反应谱完成结构内力计算,最后通过9层的摩擦耗能钢框架进行设计,并运用pushover分析和非线性动力分析进行了验证,结果表明该方法具有满意的精确度。更多还原

【Abstract】 In view of the mechanism of energy transformation,a new method of rigid-plastic-seismic-design for steel frame equipped with friction dampers is developed,in which rigid-perfectly plastic model is used for predicting the earthquake response of structures. It is assumed that dissipative zones,such as plastic hinges and friction dampers,are perfectly rigid-plastic,and non-dissipative zones remain rigid range. The procedure uses pre-selected target drift and yield mechanism as performance optimization. Based on the work-energy balance,the structure is transited to an equivalent single degree of freedom,taking into account the P-Δ effects. Structure design is accomplished by rigid-plastic displacement spectrum and plastic mechanism. The application of the method is illustrated by means of an example of a nine-story steel frame equipped with friction dampers design. The results of comparison with nonlinear time-history analysis are quite agreeable.更多还原