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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。
The elasto-plastic dynamic response of long-span reinforced concrete arched frame (RCFH) structures under near-fault impulsive vertical earthquake is studied. In this paper, two sets of 10 seismic records are collected. Through the elastic-plastic dynamic time-history analysis of a two-dimensional planar long-span RCFH structure, which is simplified by the actual engineering structure, the main beam span of the structure under vertical and non-impulsive earthquakes is compared. And the pressure difference between the bottom column and bottom column, the influence of the structural system parameters on the mid-span vertical displacement of the main girder was analyzed. The analysis results show that the long-span RCFH structure has significant vertical seismic dynamic effects. The near-fault pulse seismic effect has a great influence on the vertical response of the structure, especially the vertical deflection of the main girder. The influence of system parameters on the vertical Impulse seismic response has a significant impact.