（香港华艺设计顾问（深圳）有限公司， 深圳 518000）

［摘要］基于实际工程需求，某项目塔楼沿高度方向存在4次梁托柱转换，且上、下层相邻的转换梁分别在南北、东西侧交错设置，形成多重转换结构体系。由于建筑立面造型须形成横平竖直的矩形方格网形式，选择型钢混凝土转换梁、转换柱能同时兼顾建筑造型和结构受力的需求，由此提出一种四角筒双向多重大跨度错位连体的新型结构体系。经过计算分析，X，Y向框架部分承担倾覆力矩百分比分别为21%，22%，层位移曲线呈弯剪型，此结构体系符合框架-剪力墙结构受力特性。基于大震弹塑性时程计算和关键构件优化对比分析，提出采用“宽扁”形式的转换梁截面，其上支承8个楼层的转换梁上托柱增加为3根，转换梁以上所支承的楼层中底层和顶层柱改为方钢管混凝土柱等改进措施。为合理解决转换柱抗剪承载力不足的关键问题，在转换柱所在楼层的两侧相邻跨，与转换柱相连处增设一段钢板混凝土剪力墙，其内置钢板与转换梁内型钢梁连为一体，形成转换柱和钢板剪力墙共同承担水平剪力的构造措施，并通过转换梁有限元对比计算分析验证传力的合理性，为妥善解决此类问题提供一个新思路。考虑长期荷载作用时的大跨度梁抬柱结构，转换梁及其相邻上一楼层梁柱内力可能会产生突变，结构设计阶段应予以重点考虑该因素影响。

［关键词］角筒； 大跨度； 高位连体； 倾覆力矩百分比； 钢板混凝土剪力墙

中图分类号：TU318文献标识码：A文章编号：1002-848X(2019)24-0014-10

Exploration on innovation and key technologies of four corner tube bi-directional multi large-span staggered connected structural system

Zhang Wei, Yan Lijun, Zhou Xiaoguang, Chen Long, Liu Jun

(Hong Kong Huayi Design & Consultant Co., Ltd., Shenzhen 518000， China)

Abstract:Based on actual engineering requirements, there are four beam-to-column transformations along the height direction of a project tower and the upper and lower adjacent transfer beams are staggered in the south, north, east and west sides respectively, to form a multiple transformation structural system. Because the building fa-ade is modeled as a horizontal and vertical rectangular grid, the steel reinforced concrete transfer beams and columns were selected, so that the requirements of building shape and structural stress could be taken into account at the same time. A new four-corner-tube bi-directional multi large-span staggered connected structural system was proposed. After calculation and analysis, the percentage of overturning moment undertaken by the frames in X and Y directions was 21% and 22% respectively, and layer displacement curve was in bending-shearing shape. This structural system was in accordance with the mechanical characteristics of frame-shear wall structure. Some improvement measures were put forward based on the elastic-plastic time-history calculation under the rare earthquake and the comparative analysis of the optimization of key components, such as using the “wide flat” form of transfer beam section, increasing the number of transfer columns to 3 to support 8 floors above, and changing the columns on the transfer beam to concrete filled square steel tube columns. In order to solve the key problem of the insufficient shear capacity of the transfer column, a section of steel plate concrete shear wall was added at the adjacent span of both sides of the floor where the transfer column was located, and the built-in steel plate was connected with the steel beam inside the transfer beam, forming the structural measures that the transfer column and the steel plate shear wall undertook the horizontal shear together. The rationality of the transfer force was verified by the finite element analysis of the transfer beam. It provided a new way to solve these problems. Considering the large-span beam-to-column transformation structure under long-term load, the internal forces of the transfer beam and beam-column internal forces of its adjacent upper floor may change suddenly. The influence of this factor should be considered in the stage of structural design.

Keywords:corner tube; large span; high-position connected structure; overturning moment percentage; steel plate concrete shear wall

作者简介：张伟，硕士，高级工程师，Email: 593225626@qq.com。