复杂环形内悬空空间钢管桁架的动位移响应  

DYNAMIC RESPONSE OF STEEL TUBE TRUSS IN COMPLEX ANNULAR SPACE

作　　者：王小庆 邢耀安 郑军 蔡向东 罗冰冰 程选生[2] WANG Xiaoqing;XING Yaoan;ZHENG Jun;CAI Xiangdong;LUO Bingbing;CHENG Xuansheng(China Railway 21st Bureau Group Second Engineering Co.,Ltd.,Lanzhou 730000,China;School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]中铁二十一局集团第二工程有限公司,兰州730030 [2]兰州理工大学土木工程学院,兰州730050

出　　处：《低温建筑技术》2022年第1期117-121,共5页Low Temperature Architecture Technology

摘　　要：文中以大底盘多塔环形钢框架体系的中心区钢结构为主要研究对象,以结构的悬空区域的动力学特性为研究重点。通过现场试验获得架空部位楼板的自振特性,根据试验模态完善该区域的计算分析模型。通过对计算模型输入不同地震波的地震动竖向激励,得到了架空部位的最不利点位的位移时程曲线。对比分析了3种地震波下结构的动位移,得出内环架空桁架柱体系的动位移响应最小,其次是外环架空桁架柱体系,最后是钢梁垮中,这表明内环架空桁架柱体系的结构刚度最大,外环架空桁架柱体系次之,钢梁刚度最小。This paper studies the steel structure of the central area of the large chassis multi-tower annular steel frame system and the dynamic characteristics of the suspended area of the structure. The natural vibration characteristics of the floor at the overhead part are obtained through field tests, and the calculation and analysis model of the area is improved according to the test modes. By inputting the vertical excitation of different seismic waves to the calculation model, the displacement time history curve of the most unfavorable point of the overhead part is obtained. The dynamic displacement of the structure under three seismic waves is compared and analyzed. It is concluded that the dynamic displacement response of the inner ring overhead truss column system is the smallest,followed by the outer ring overhead truss column system, and finally the steel beam collapse, indicating that the structural stiffness of the inner ring overhead truss column system is the largest, the outer ring overhead truss column system is the second, and the steel beam stiffness is the smallest.

关 键 词：空间钢管桁架 试验模态 计算模态 动位移 

分 类 号：TU311.3[建筑科学—结构工程]