Dynamic responses on traditional Chinese timber multi-story building with high platform base under earthquake excitations

IF 1.4 4区 工程技术 Q3 ENGINEERING, CIVIL Earthquakes and Structures Pub Date : 2020-11-01 DOI:10.12989/EAS.2020.19.5.331
Xicheng Zhang, Hui Ma, Yanli Zhao, Hong-tie Zhao
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Abstract

The multi-story timber structure with high platform base is one of the important architectural types in the traditional Chinese buildings. To study the dynamic characteristics and seismic responses on this kind of traditional structure, the 3-D finite element models of Xi'an drum tower which included the high platform base, upper timber structure and whole structure was established considering the structural form and material performance parameters of the structure in this study. By the modal analysis, the main frequencies and mode shapes of this kind of traditional building were obtained and investigated. The three kinds of earthquake excitations included El-Centro wave, Taft wave and Lanzhou wave were separately imposed on the upper timber structure model and the overall structure model, and the seismic responses on the tops of columns were analyzed. The results of time history analysis show that the seismic response of the upper timber structure is obviously amplified by high platform base. After considering the effect of high platform base, the mean value on the lateral displacement increments of the top column in the overall structure is more than 20.478% and the increase of dynamic coefficients was all above 0.818 under the above three different earthquake excitations. Obviously, it shows that the existence of high platform base has a negative influence on the seismic responses of upper timber structure. And the high platform base will directly affect the safety of the upper timber structure. Therefore, the influence of high platform base on the dynamic response of its upper timber structure cannot be neglected.
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地震作用下中国传统木结构高平台多层建筑的动力响应
高台基多层木结构是中国传统建筑中重要的建筑类型之一。为了研究这种传统结构的动力特性和地震反应,考虑结构形式和材料性能参数,建立了包括高平台基础、上部木结构和整体结构在内的西安鼓楼三维有限元模型。通过模态分析,得到了这类传统建筑的主频率和模态振型。分别在上部木结构模型和整体结构模型上施加El-Centro波、Taft波和兰州波3种地震激励,分析柱顶的地震反应。时程分析结果表明,较高的平台基础明显放大了上部木结构的地震反应。考虑高平台基础的影响后,三种不同地震作用下,整体结构顶柱侧移增量均值均大于20.478%,动力系数增幅均在0.818以上。结果表明,高平台基础的存在对上部木结构的地震反应有负面影响。而平台底座过高将直接影响上部木结构的安全。因此,高平台基础对其上部木结构动力响应的影响不容忽视。
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来源期刊
Earthquakes and Structures
Earthquakes and Structures ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
2.90
自引率
20.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Earthquakes and Structures, An International Journal, focuses on the effects of earthquakes on civil engineering structures. The journal will serve as a powerful repository of technical information and will provide a highimpact publication platform for the global community of researchers in the traditional, as well as emerging, subdisciplines of the broader earthquake engineering field. Specifically, some of the major topics covered by the Journal include: .. characterization of strong ground motions, .. quantification of earthquake demand and structural capacity, .. design of earthquake resistant structures and foundations, .. experimental and computational methods, .. seismic regulations and building codes, .. seismic hazard assessment, .. seismic risk mitigation, .. site effects and soil-structure interaction, .. assessment, repair and strengthening of existing structures, including historic structures and monuments, and .. emerging technologies including passive control technologies, structural monitoring systems, and cyberinfrastructure tools for seismic data management, experimental applications, early warning and response
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