大跨度圆竹拱结构动力测试及有限元模型修正  

Dynamic test and finite element model modification of long-span round bamboo arch structures

作　　者：张建[1,2] 钱孝文 杨娜 杨庆山[3] 刘可为 聂诗东[3] ZHANG Jian;QIAN Xiaowen;YANG Na;YANG Qingshan;LIU Kewei;NIE Shidong(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;Beijing’s Key Laboratory of Structure Wind Engineering and Urban Wind Environment,Beijing 100044,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China;International Bamboo and Rattan Organization,Beijing 100102,China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]结构风工程与城市风环境北京市重点实验室,北京100044 [3]重庆大学土木工程学院,重庆400045 [4]国际竹藤组织,北京100102

出　　处：《建筑结构学报》2022年第2期94-104,共11页Journal of Building Structures

基　　金：中央高校基本科研业务费(2020JBM040);国家自然科学基金面上项目(51778045)。

摘　　要：为深入研究圆竹结构的结构动力性能,以2019年北京世界园艺博览会国际竹藤组织馆为对象,研究其大跨度圆竹拱结构的动力特性。采用现场实测的试验方法对该圆竹拱结构进行动力测试,获得了该结构加速度响应信号,采用峰值拾取法与随机子空间识别法对响应信号进行分析并获得了该结构的固有频率、振型及阻尼比。同时,基于实测模态参数对该圆竹拱结构进行了有限元模型修正。研究结果表明:该圆竹拱结构平面外刚度大于平面内刚度,在动力荷载作用下更易引起平面内的振动;识别的结构各阶阻尼比在1.5%~4.5%之间,均属于小阻尼;采用基于灵敏度分析的参数型修正法能够准确高效地对该竹拱结构的有限元模型进行修正,修正后的有限元模型能够反映实际结构的动力特性。研究成果对其他类似圆竹结构工程具有参考价值。In order to accurately understand the dynamic performance of round bamboo structures,the International Network for Bamboo and Rattan(INBAR)Pavilion of 2019 Beijing International Horticultural Exhibition was taken as a case study,and the dynamic characteristics of a new long-span round bamboo arch structure were studied.First,a dynamic test of the round bamboo arch structure was carried out by the onsite test method,and the acceleration response signal of the structure was obtained.Then,the structural frequency,vibration mode and damping ratio were obtained by the peak picking method and stochastic subspace identification method to analyze the response signal.Finally,based on measured modal parameters,the finite element model of the round bamboo arch structure was modified.The research results show that the out-of-plane stiffness of the round bamboo arch structure is larger than the in-plane stiffness,and in-plane vibration is more likely to occur under dynamic loads.The damping ratios of different modes are between 1.5%and 4.5%,all indicating small damping.The parametric correction method based on sensitivity analysis can be used to modify the finite element model of the round bamboo arch structure accurately and efficiently,and the modified finite element model can reflect the dynamic characteristics of the practical round bamboo roof structure.The modal parameters obtained from this research have great significance for further research and practical application of long-span round bamboo arch structures.

关 键 词：圆竹拱结构 现场实测 模态参数 灵敏度分析 有限元模型修正 

分 类 号：TU366.1[建筑科学—结构工程]