摘要
由于振动台尺寸的限制,面向工程的大跨度空间结构振动台试验存在动力缩尺模型比例小的问题,缩尺模型设计和加工较为困难。针对上述问题,采用奥氏体304不锈钢作为替代材料,基于热挤压成型技术制作符合相似关系的非标准截面杆件,利用氩弧焊完成杆件与节点的连接。以兰州奥体中心综合馆跨度94 m的弦支穹顶屋盖结构1∶20动力缩尺模型设计制作为例,阐述了小比例动力缩尺模型的材料选择、杆件设计与加工方法、动力相似关系确定方法、附加质量设计和连接节点设计与加工方法等。基于有限元模拟和振动台试验,对比了原型结构和缩尺模型在静载下的节点位移和杆件内力以及二者的自振频率。结果表明:提出的小比例缩尺模型设计方法具有材料易于获得、杆件和节点易于加工、节点连接可靠的特点,原型结构和缩尺模型的相似关系吻合较好。
Limited by the size of seismic simulation shaking tables,the shaking table test of engineering-oriented large-span spatial structures suffers from difficulties associated with the small scale of the dynamic scale model,including the difficulties in finding suitable materials,in producing small and thin rods and in connecting members.This paper proposes to use authenticate 304 stainless steel to make model members based on the hot extrusion technology,and to use argon shielded welding for the member connection.Taking the 1∶20 dynamic scale model design of the 94 m span suspen-dome roof structure of the Lanzhou Olympic Sports Center Complex as an example,the material selection method of the small-scale dynamic scale model,the member design and production method,the determination method of the dynamic similarity relationship,and the design and production methods of additional mass and connections,were explained.A finite element model was established and numerical simulations were carried out.The structural characteristics and responses of the prototype structure and the scale model were compared in terms of the node displacement and internal force of the members under static loads as well as the natural vibration characteristics and seismic responses.The results show that the design method provided for the small-scale model has the advantages of easy material acquisition,easy production of members and connections,and reliable connection.The prototype structure and the scale model satisfy similarity relationships.
作者
李雄彦
刘人杰
景辉
薛素铎
樊钦鑫
卢珍
LI Xiongyan;LIU Renjie;JING Hui;XUE Suduo;FAN Qinxin;LU Zhen(Spatial Structures Research Center,Beijing University of Technology,Beijing 100124,China;School of Civil Engineering,Yantai University,Yantai 264005,China;China Aviation Planning and Design Institute(Group)Co.,Ltd,Beijing 100120,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2022年第12期267-275,共9页
Journal of Building Structures
基金
国家自然科学基金面上项目(51778017,51878014,51978596)
山东省自然科学基金青年项目(ZR201911030049)。
