Mechanism Investigation on Lateral Displacement Resistance of Diagrid Structures in High-Rise Buildings
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摘要:
为研究不同平面形式对高层建筑斜交网格结构受力性能及刚度退化的影响，开展了正八边形斜交网格结构模型的水平推覆试验，建立了平面形式为四边形、六边形、八边形、十二边形和二十四边形的斜交网格结构，并与四边形框筒结构模型进行对比，分析了平面形式对斜交网格结构侧向刚度、延性、内力、剪力滞后和屈服顺序等影响. 研究结果表明：不同平面形式斜交网格结构模型的延性系数分布范围为4.27～5.22，随着结构平面边数增加，整体抗侧刚度逐渐增加，且延性越好，受力机理越合理；由于斜交网格结构主要通过斜柱传递轴力，剪力滞后效应明显比框筒结构小，随着平面边数增加，斜交网格结构受压翼缘部的剪力滞比由1.32降为0.82，平面形式为正六边形、正八边形、正十二边形、正二十四边形的斜交网格结构均较平面形式为正四边形时更接近于1.00；在斜交网格结构的水平推覆试验过程中，翼缘部与腹部相交区域的斜柱先屈服，塑性变形增大，再向翼缘部与腹部中部延展，随后沿结构底部向上扩展.
Abstract:In order to study the effects of various plane forms on the mechanical performance and stiffness degradation of diagrid outer tube structures, the numerical model of a regular octagonal diagrid structure is verified by the hor-izontal pushover test. Diagrid structures with plane forms of quadrilateral, hexagon, octagon, dodecagon, and icosikaitera (24-gon) are further established. Compared with the quadrilateral framed tube structure model, the effects of plane forms on the lateral stiffness, ductility, internal force, shear lag and yield order are analyzed. Results show that the distribution range of ductility coefficient of various plane diagrid structure models is 4.27–5.22. With the number of plane edges increasing, the overall lateral stiffness increases gradually, and the better the ductility, the more reasonable the stress mechanism. In addition, since the axial force is mainly transmitted through tilted columns in diagrid structures, the shear lag effect of diagrid structures is obviously smaller than that of the frame tube structure. With the increase of the number of plane edges, the shear lag ratio of the compression flange of the diagrid structures decreases from 1.32 to 0.82. The shear lag ratio of diagrid structures with plane forms of regular hexagon, regular octagon, regular dodecagon and regular 24-gon is closer to 1.00 than that with the plane form of regular quadrilateral. In the horizontal pushover test of diagrid structures, the yield first occurred to the tilted column in the intersection area between the flange and the web with increased plastic deformation, then extended to the flange and the middle of web, and finally extended upward from the structure bottom.
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Key words:
- high-rise buildings /
- grid structure /
- pushover test /
- ductility /
- shear lag /
- yield sequence /
- seismic performance
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图 1 水平推覆试验验证数值模型结果
Figure 1. Verification of numerical model results using horizontal pusho-ver tests
图 7 各层节点侧移标准差
Figure 7. Standard deviation of lateral displacement of nodes at each story
表 1 翼缘部受压区各阶段剪力滞比
Table 1. Shear lag ratios of each stage incompression zone of flange
模型 斜交
角度/（°）平面
边数水平荷载/ kN 30 50 100 四边形 68 4 1.32 1.35 1.15 六边形 68 6 1.04 1.04 0.80 八边形 68 8 0.82 0.81 0.86 十二边形 68 12 0.83 0.82 0.78 二十四边形 68 24 0.83 0.82 0.76 四边形框筒 90 4 2.87 3.06 
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