某酒店混凝土异形分叉斜柱的分析与设计

Analysis and design of the concrete irregular branching inclined column of a hotel

为实现建筑内收双曲外立面的效果及室内装饰需求,结构采用局部楼层无平面外框架梁直接拉结的混凝土异形分叉斜柱。主塔楼异形分叉斜柱分布于平面四角,底部四层为逐渐扩大的一根异形混凝土柱,其上为两根分开斜柱通至屋顶。设计首先采用YJK软件对平面外无框架梁直接拉结的斜柱周边的楼板进行应力分析,由于分叉柱斜率较缓,楼板应力水平在各工况下较小,满足设计要求;进而,结合Xtract截面设计器,对构件进行小震、等效中震及大震弹塑性下的性能化设计校核;最后,采用MIDAS FEA NX软件对异形柱分叉节点进行有限元分析,以揭示节点区复杂应力分布的真实状态。结果显示,混凝土异形分叉斜柱的设计可以满足既定性能目标的要求,节点及构件均安全可靠,分析过程可供同类工程参考。

To satisfy the double curved surface of the adductive architectural facade and the inner design concept, the concrete irregular branching inclined column with no beam directly stretching on some floor is adopted. The irregular branching inclined columns of the main tower are situated in four corners of the layout with one singular section during the starting four floors, which seperates into two sections tilting to the top. In the design process, the floor stress analysis using YJK programme is going through under the area where no beam is directly pulling the inclined column. As the slope of the column is gentle, the floor stress under each load case is minor and satisfies the demand;meanwhile, the combination of Xtract section calculator is used to analyze the frequently/medium/rarely occurred earthquake with elastic/elastic-plastic method all based on the performance-based seismic concept;In the end, the MIDAS FEA NX is carried out through the irregular column branching joint to show the real stress distribution under the complicated load circumstance. All the results show that the design of the concrete irregular branching inclined column is in accord with the expected target and both the joint and the construction member are safe and reliable. It can be a reference for other similar projects.