（北京市建筑设计研究院有限公司， 北京 100045）

［摘要］许昌建安文化广场造型奇特、雄伟，其地上部分通过结构缝分为西南大底盘双塔、东南影厅和北面多层三部分，其中西南大底盘双塔和东南影厅均属于特别不规则的超限高层，存在多个设计关键点和难点。首先对西南大底盘双塔的结构体系及其存在的凹凸不规则、楼板不连续等不规则状况，和东南影厅顶层规则大空间设计等情况做了较为详细的介绍，并在概念设计上采取了一系列针对性措施和处理方法；在此基础上，详细阐述了西南双塔抗震等级的确定，并进一步简要陈述了常规小震弹性对比分析、小震弹性时程分析、关键构件的性能化设计以及整体结构的动力弹塑性分析等一系列设计分析内容。分析结果表明，该项目结构具有良好的抗震性能。

［关键词］大底盘双塔结构； 超限高层建筑； 楼板不连续； 抗震等级

中图分类号：TU318-2文献标识码：A文章编号：1002-848X(2021)01-0026-05

Structural design of Xuchang Jian′an Cultural Square

ZHANG Jianliang, MA Jingyou, ZHOU Bing, ZHANG Hao

(Beijing Institute of Architectural Design, Beijing 100045, China)

Abstract:Xuchang Jian′an Cultural Square has a peculiar and magnificent shape. The overground part is divided by structural joints into three parts, namely, the large-chassis twin-tower structure in the southwest position, the southeast film hall and the multi-story building in the north position. Among them, the large-chassis twin-tower structure in the southwest position and the southeast film hall are all particularly irregular out-of-code high-rise buildings, and there are many key points and difficulties in the design. First of all, a detailed introduction was made to the structural system of the southwest large-chassis twin-tower structure and its irregularities such as concave convex irregularities and discontinuous floors, as well as the regular and large space design of the top floor of the southeast film hall, and a series of targeted measures and treatment methods were presented in conceptual design. On this basis, the determination of the seismic grade of the large-chassis twin-tower structure in the southwest position was elaborated, and a series of design analysis contents were conducted including the conventional elastic comparison analysis under frequent earthquakes, elastic time-history analysis under frequent earthquakes, and performance-based design of key components and dynamic elastoplastic analysis of overall structure. The analysis results show that the structure of the project has good seismic performance.

Keywords:large-chassis twin-tower structure; out-of-code high-rise building; discontinuous floor; seismic grade