SEISMIC ELASTIC-PLASTIC RESPONSE OF LONG-SPAN RC FRAME STRUCTURE WITH HAUNCHED MEMBERS SUBJECTED TO PULSE-LIKE VERTICAL GROUND MOTIONS
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摘要: 研究大跨度钢筋混凝土带腋撑框架(RCFH)结构在近断层脉冲型竖向地震作用下的弹塑性动力反应特性。该文采用两组10条集集地震动记录，通过实际工程结构简化的二维平面大跨度RCFH结构的弹塑性动力时程分析，比较竖向脉冲型和非脉冲型地震作用下结构主梁跨中位移和底层柱底轴压力的差异，分析结构体系参数对主梁跨中竖向位移的影响。分析结果表明：大跨度RCFH结构有显著的竖向地震动力效应；近断层脉冲地震效应对结构竖向反应的影响较大，特别对主梁竖向挠度的影响较大；体系参数对结构竖向脉冲地震反应有重要影响。Abstract: Elasto-plastic dynamic responses of long-span reinforced concrete frame structures with haunched members (RCFH) are studied under near-fault pulse-like vertical ground motions. 10 ground motions of Chichi earthquake are selected and divided into two groups. The long-span plane RCFH structure simplified from the practical engineering project is employed to perform elastic-plastic dynamic time-history analysis. Vertical mid-beam displacement and axial pressure of bottom column base of structures are compared under the vertical pulse-like and vertical non-pulse ground motions, and the effects of the structural system parameter on vertical mid-beam displacement are analyzed. The study show that the vertical earthquake response of long-span RCFH structure is significant, especially under the pulse-like ground motions; the structural system parameters have an important influence on the vertical pulse-like earthquake response.
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