（哈尔滨工业大学建筑设计研究院， 哈尔滨 150090）

［摘要］以国家技术转移郑州中心工程中的长悬挑钢桁架结构为例，采用MIDAS Building软件，选取拆除构件法对其进行抗连续倒塌分析；阐述验证悬挑桁架结构形式抗连续倒塌能力的具体过程，讨论了楼板刚度退化后悬挑桁架的承载能力和相应的加强措施；采用ANSYS软件对悬挑钢桁架典型节点进行了有限元分析。结合规范规定和结构自身特点，提出了相应的构造措施，如杆件采用对称截面和楼板通长配筋可使构件能够承受往复地震作用，设置有效面外支撑、节点按刚接处理可提高结构的抗连续倒塌性能等，供其他类似工程参考。

［关键词］悬挑钢桁架； 抗连续倒塌； 拆除构件法； 楼板刚度退化； 节点有限元分析

中图分类号：TU391文献标识码：A文章编号：1002-848X(2018)12-0070-05

Progressive collapse resistance design for steel cantilevered truss of National Center for Technology Transfer in Zhengzhou

Shang Qingpeng, Chen Minghui, Wang Xianwei, Cai Li, Wang Chunyan

(The Architectural Design and Research Institute of HIT, Harbin 150090, China)

Abstract:Taking the long-cantilevered steel truss structure in the National Center for Technology Transfer in Zhengzhou as an example, the MIDAS Building software was used to perform the progressive collapse resistance analysis using the demolition member method. The specific process for verifying the progressive collapse resistance of cantilevered truss structure was described. The load-bearing capacity and strengthening measures of the cantilevered trusses after the degradation of the floor stiffness were discussed. The finite element analysis was performed on the typical joints of the cantilevered truss using ANSYS software. Combining with the specifications and the characteristics of the structure itself, corresponding construction measures were proposed. For example, the symmetrical cross-section of the member and the full-length reinforcement in the floor would make the members be able to withstand the reciprocating earthquake actions. Effective out-of-plane braces were set up and the joints were designed as rigid connections. Those measures could improve the progressive collapse resistance performance of the structure, which could be used as a reference for other projects.

Keywords: cantilevered steel truss; progressive collapse resistance; demolition member method; degradation of the floor stiffness; finite element analysis of joint

作者简介：尚庆鹏，硕士，工程师，Email:sqphit@126.com。