曲线网格高层斜交网筒结构体系抗侧性能

为了使网筒结构更适应高层建筑的受力特点,提出曲线网格高层斜交网筒结构,并分析其抗侧性能的影响因素。通过弹性反应谱法进行系列模型计算,探讨了曲柱底部角度、顶部角度、结构高宽比等几何参数以及环梁、角柱、杆件连接形式等结构因素对结构抗侧性能和受力性能的影响。其中,底部角度和高宽比是主要几何参数,主环梁是主要结构因素。在一定高宽比下,底部角度存在最优区间,在此区间,顶部角度的影响较小;当底部角度远离其最优区间时,顶部角度才有明显影响。设置主环梁可大大减小曲柱弯矩、有效改善曲柱受力。角柱、杆件连接形式对结构性能的影响较小。总体而言,曲线网格高层斜交网筒结构的抗侧性能优于目前常用的等角度直线柱高层斜交网筒结构。

Lateral resistance of high-rise diagrid tubular structures with curved meshes

In order to further represent mechanical characteristics of high-rise buildings,diagrid tubular structures with curved meshes were configurated geometrically and structurally.Effects of some related factors on lateral resistance of this structure type were evaluated,including geometric parameters such as angles of curved diagonals,and height-to-width aspect ratio,along with structural factors such as major ring beams,corner columns and node connections.Elastic response spectrum analysis was carried out for a set of structural models.Bottom angle of curved diagonals and aspect ratio are geometrically more sensitive to lateral resistance,while major ring beam is structurally dominant.For a certain aspect ratio,there exists an optimal range of bottom angle of curved diagonals,within which effect of top angle of curved diagonals is limited.Arrangement of major ring beams significantly reduces moment of curved diagonals.Corner columns and node connections slightly affect lateral resistance.Generally,high-rise diagrid tubular structures with curved meshes have more excellent lateral resistance than those composed of straight diagonals with uniform angles.