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综合利用钢-混凝土组合结构技术和耗能减震技术,提出带耗能腋撑型钢混凝土新型转换结构,利用耗能腋撑改善转换结构抗震性能差的问题。以普通和带耗能腋撑型钢混凝土转换框架结构为研究对象,进行增量动力分析,建立该新型转换结构地震易损性曲线方程,研究防屈曲耗能腋撑对型钢混凝土转换结构破坏机制的影响。分析结果表明:防屈曲耗能腋撑有效降低型钢混凝土转换结构在中度、重度损伤破坏及倒塌破坏状态的超越概率,可作为一道可靠的抗震防线。耗能腋撑的设置避免了普通型钢混凝土转换框架结构在转换层及其相邻楼层处形成层侧移机构,减小转换构件的塑性变形,有效地防止型钢混凝土转换结构发生整体或局部倒塌破坏。
Based on the comprehensive utilization of the steel-concrete composite structure technology and the energy-saving damping technology, a new type of steel-concrete transition structure with energy-dissipated axillary brace is proposed. The energy-dissipative axillary brace is used to improve the poor seismic performance of the converted structure. Taking the ordinary and the energy-dissipated axel-jointed steel-concrete frame structure as the research object, the incremental dynamic analysis is carried out to establish the seismic fragility curve equation of the new structure and to study the failure mechanism of the buckling- influences. The analysis results show that the buckling-resistant axillary braces can effectively reduce the probability of overrun of moderately and severely damaged structures and collapsed structures, and can be used as a reliable seismic defense line. The arrangement of the energy-dissipating axles avoids the formation of the layer-side displacement mechanism of the common type steel-concrete conversion frame structure on the conversion layer and its adjacent floors, reduces the plastic deformation of the conversion components and effectively prevents the whole or partial collapse of the steel-concrete conversion structure from being destroyed .