（北京市建筑设计研究院有限公司， 北京 100045）

［摘要］国家会议中心二期项目总建筑面积40-9万m2，主要功能为会议、展览及配套用房。主体结构利用首层顶板及其周边夹层设置巨型转换桁架，实现会议、展览大空间跨越，并作为支承上部多层建筑的转换结构。着重对大跨重载转换结构在竖向荷载、温度作用及施工过程中的传力路径及承载能力进行系统分析，并分别采用时程分析、振型分解反应谱法及规范简化算法对转换结构竖向地震作用效应进行评估。选取典型转换桁架进行抗连续倒塌分析，并对重载转换结构相关范围楼盖进行了舒适度分析，验证了主体结构在弹性阶段的承载能力及刚度。根据性能化设计要求，对主体结构进行动力弹塑性分析，考察罕遇地震作用下主体结构抗震性能及关键构件损伤情况。

［关键词］大跨重载转换结构； 竖向地震响应； 温度作用； 抗连续倒塌分析； 楼板舒适度分析

中图分类号：TU318文献标识码：A文章编号：1002-848X(2019)18-0065-06

Structural design of second-phase project of National Convention Center

Wang Xinxin, Yu Donghui, Han Wei, Chang Ting, Xu Jinbei, Cai Chong, Liu Chang

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

Abstract:The second phase of the National Convention Center has a total construction area of 409 000 m2. Its main functions are conferences, exhibitions and supporting houses. The main structure uses the first floor and its surrounding mezzanine to set up a giant conversion truss to realize the large space spanning of the conference and exhibition, and as a conversion structure supporting the upper multi-story building. The force transmission path and bearing capacity of the large-span conversion structure under vertical load, temperature effect during the construction process were systematic analyzed, and the time-history analysis, the vibration mode decomposition response spectrum method and the standard simplification algorithm were used to evaluate the effects of vertical earthquake action of conversion structure.The typical conversion truss was selected for anti-progressive collapse analysis, and the comfort analysis of the relevant cover of the heavy-duty conversion structure was carried out to verify the bearing capacity and rigidity of the main structure in the elastic stage. According to the performance design requirements, the dynamic elastoplastic analysis of the main structure was carried out to investigate the seismic performance and damage of key components of the main structure under rare earthquakes.

Keywords:long-span heavy-load transfer structure; vertical seismic response; temperature effect; anti-progressive collapse;  floor comfort analysis

作者简介：王鑫鑫，硕士，工程师，Email:wangxinxin@biad.com.cn。