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为研究高层组合框架-混凝土筒体混合结构的抗震性能,以30层混合结构为分析对象,建立整体空间分析模型进行推覆分析。根据截面承载力与变形能力自定义型钢混凝土构件塑性铰特性值,利用三垂直杆元模拟剪力墙,各杆元分别考虑剪力墙轴向、剪切与弯曲变形,在推覆分析中分别按加速度常量和CQC振型组合方式施加侧向水平荷载,采用能力谱法确定结构的目标位移。结果表明:结构由弹性逐渐进入弹塑性工作状态,最大层间位移角的位置不断降低,中下部层间位移角变化显著,框架与筒体之间剪力重分布主要发生在中下部楼层;框架与混凝土筒体之间连接方式对混合结构罕遇地震性能点的状态影响显著,尤其在结构下部1/3高度范围内,筒体剪切刚度退化程度有差异,刚接模型整体刚度退化程度相比铰接模型严重。
In order to study the seismic behavior of high-rise composite frame-concrete hybrid structures, a 30-storey mixed structure was taken as the analysis object to establish a global spatial analysis model for pushover analysis. According to the plastic hinge characteristic value of the SRC member, the three vertical bar element simulation shear walls are used to calculate the axial, shear and bending deformation of the shear wall respectively. Lateral horizontal loads are applied by the combination of acceleration constants and CQC mode shapes, and the target displacement of the structure is determined by the power spectrum method. The results show that the structure gradually enters the elasto-plastic working state from the elasticity, the position of the maximum inter-story drift angle decreases and the displacement angle between the middle and lower floors changes significantly. The shear redistribution between the frame and the cylinder mainly occurs in the middle and lower floors. Especially, in the lower 1/3 of the height of the structure, there is a difference in the degree of degeneration of the shear rigidity of the cylinder, and the degree of degeneration of the rigidity of the rigid-connection model Serious than the hinged model.