典型密檐式砖塔振动台试验研究及数值分析
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TU362; TH82

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陕西省自然科学基础研究计划资助项目(2019JQ?578);教育部重点实验室开发基金资助项目(KL?SEER?ME?202003);西部绿色建筑国家重点实验室开放研究基金资助项目(LSKF202116);陕西省创新能力支撑计划资助项目(2020PT?038);榆林市科技计划资助项目(CXY?2020?053)


Shaking Table Test and Numerical Analysis of Typical Brick Pagoda with Dense Eaves
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    摘要:

    为研究密檐式砖塔在不同地震强度作用下的动力响应及抗震性能,以典型的密檐式砖塔——小雁塔为例,设计了1/10的比例模型,并对其进行3条地震波作用下3种地震烈度、9个工况的振动台试验。结合有限元模拟,分析结构的动力特性、加速度响应、位移响应、剪力响应和应力响应等,结果表明:峰值加速度(peak ground acceleration,简称PGA)为0.2g时,结构无明显异样,小雁塔基本处于弹性状态;PGA不小于0.6g时,塔根部东西两侧易形成水平贯通缝,南北劵洞处易形成斜向贯通缝,塔身顶部晃动明显;伴随地震激励增强,结构损伤积累,自振频率降低,阻尼比增加,加速度放大效应减弱,惯性力和楼层剪力增幅放缓。通过进行典型的密檐式砖塔振动台试验,结合数值分析,可为评定密檐式砖塔抗震能力提供参考。

    Abstract:

    To study the dynamic response and seismic performance of dense eave brick pagodas under different earthquake intensities, taking a typical dense eave brick pagoda:Xiaoyan Pagoda as an example, a 1/10 scaled model is designed and the shaking table tests with three seismic waves,three seismic intensities and nine working conditions is conducted. Combining finite element simulation,the dynamic characteristics,acceleration responses,displacement responses,shear responses,and stress responses of the structure are analyzed. The results show that when the peak ground acceleration (PGA) is 0.2g, no obvious abnormity is observed,which indicated that Xiaoyan Pagoda is basically in an elastic state. When the PGA is not less than 0.6g,horizontal through cracks are generated easily on the east and west sides of the pagoda root,and oblique through cracks are generated easily at the north and south arches, and the top of the pagoda is visibly shaken. With the increasing seismic excitation, the structural damage accumulates and the natural vibration frequency decreases,the damping ratio increasing, resulting in the acceleration amplification effect weaken,then the increase of inertia force and floor shear force slows down. Through the typical shaking table tests and numerical analysis, it is a reference for the evaluation of the seismic capacity of the dense eave brick pagoda.

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  • 在线发布日期: 2022-05-06
  • 出版日期: 2022-04-30
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