钢管混凝土斜交网格结构性能分析

摘要

The analysis model of concrete-filled steel tubular (CFST) diagrid structure in this paper is conducted on the basis of design for Guangzhou West Tower. The influences of diagonal angle on structural period, displacement, stiffness irregularity, shear force and moment distribution between CFST tube and concrete core wall are analyzed. The effects of thickness of core wall on structural performance are also investigated. The analysis results indicate that the optimal diagonal angle is between 68° and 78° when the structural depth-width ratio is greater than 5. Decreasing diagonal angle would induce the structural irregularity and reduction of the structural stiffness. In addition,shear force and moment distribution become more rational by increasing the thickness of core wall.%以广州西塔为工程背景,建立了圆筒钢管混凝土斜交网格结构模型,分析了斜柱倾角对结构周期、侧移、竖向刚度和内外筒的弯矩和剪力分配的影响,探讨了核心筒剪力墙厚度对结构性能的影响.结果表明:高宽比大于5的圆筒斜交网格结构的最优斜交角度介于68° ～78°；随着斜柱倾角的减小,结构抗侧刚度下降,下部楼层刚度突变明显；随着核心筒墙厚的增加,结构自振周期略有增大,内外筒的基底剪力与弯矩分配更加合理.