内置拉索钢桁架悬挂结构的受力分析及设计对策  

Stress analysis and design countermeasures of steel truss suspension structure with internal cable

作　　者：严力军 吴震 张伟 何涛 刘俊 YAN Lijun;WU Zhen;ZHANG Wei;HE Tao;LIU Jun(Hong Kong Hua Yi Design Consultants(s.z.)Ltd.,Shenzhen 518000,China;China Construction Science&Technology Group Co.,Ltd.,Shenzhen 518000,China;Times China Holdings Co.,Ltd.,Guangzhou 510030,China)

机构地区：[1]香港华艺设计顾问(深圳)有限公司,深圳518000 [2]中建科技集团华南有限公司,深圳518000 [3]时代中国控股有限公司,广州510030

出　　处：《建筑结构》2024年第21期101-109,共9页Building Structure

基　　金：香港华艺设计顾问(深圳)有限公司研发课题(KY200A20)。

摘　　要：以深圳艺展天地展示中心项目为研究背景,为实现室内通高中空区域,设置3组大跨度空中连廊,每组采用在塔楼顶部2层高度范围设置3~4榀钢桁架作为主结构、下挂若干层钢框架为次结构的结构方案。提出在钢桁架跨中竖杆及对应下挂钢柱内通高增设预应力钢拉索方案,以实现给悬挂结构提供第二道受力防线目的,将钢结构和预应力技术有机结合,遵循"少投入,高收益"的设计思想,有效提高结构体系承载能力。采用SP2000软件对空中连廊予以数个专项分析,分别开展钢拉索施工模拟、连续倒塌、不同初始预应力值影响因素、拆杆过程动力时程、水平力作用对钢拉索内力影响、罕遇地震作用下钢拉索受力性能、舒适度验算等方面的分析研究,揭示增设钢拉索可提高悬挂结构变形协调能力及整体安全度的受力机理。对整体结构罕遇地震弹塑性分析表明,空中连廊钢结构构件均处于弹性状态,仅塔楼部分墙肢损伤较大,通过采用适当提高墙肢和暗柱配筋率等措施,可有效提高其整体抗震性能。Based on the project of the Shenzhen Yi Zhan Tian Di Exhibition Center,three sets of large⁃span overhead corridors were introduced to build overall height and hollow indoor space,the structural scheme was adopted with 3~4 steel trusses serving as the main structure,positioned within the top two floors of the tower,the secondary structure consists of several floors of steel frames suspended below.A proposal was made to add prestressed steel cables throughout the height of the vertical web members of the steel trusses and the corresponding steel columns below,to achieve the goal of providing a secondary defense line for the suspension structure.The integration of steel structure and prestressing technology follows the design philosophy of‘low investment,high return’effectively enhancing the load⁃bearing capacity of the structural system.Using SAP2000 software,several specialized analyses were conducted on the overhead corridors,including steel cable construction simulation,progressive collapse,the impact of different initial prestress values,dynamic time history during the dismantling process,the effect of horizontal forces on the internal forces of the steel cables,performance under rare seismic events,and comfort calculations.These studies reveal the force mechanism by which the addition of steel cables enhances both the deformation coordination ability and overall safety of the suspension structure.The elastic⁃plastic analysis of the entire structure under rare seismic events indicate that the steel components of the overhead corridors remained in an elastic state,with only significant damage observed in some wall limbs of the tower,measures such as increasing the reinforcement ratio of the wall limbs and hidden columns were implemented,effectively improving the overall seismic performance.

关 键 词：钢桁架悬挂结构 预应力钢拉索 张拉时机 连续倒塌 舒适度 

分 类 号：TU318[建筑科学—结构工程]