Earthquakes and Structures

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Key technologies research on the response of a double-story isolated structure subjected to long-period earthquake motion

  • Liang Gao (College of Civil Engineering, Southwest Forestry University) ;
  • Dewen Liu (College of Civil Engineering, Southwest Forestry University) ;
  • Yuan Zhang (College of Civil Engineering, Southwest Forestry University) ;
  • Yanping Zheng (College of Civil Engineering, Southwest Forestry University) ;
  • Jingran Xu (College of Civil Engineering, Southwest Forestry University) ;
  • Zhiang Li (College of Civil Engineering, Southwest Forestry University) ;
  • Min Lei (College of Civil Engineering, Southwest Jiaotong University)
  • Received : 2023.05.25
  • Accepted : 2023.12.14
  • Published : 2024.01.25
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Abstract

Earthquakes can lead to substantial damage to buildings, with long-period ground motion being particularly destructive. The design of high-performance building structures has become a prominent focus of research. The double-story isolated structure is a novel type of isolated structure developed from base isolated structure. To delve deeper into the building performance of double-story isolated structures, the double-story isolated structure was constructed with the upper isolated layer located in different layers, alongside a base isolated structure for comparative analysis. Nonlinear elastoplastic analyses were conducted on these structures using different ground motion inputs, including ordinary ground motion, near-field impulsive ground motion, and far-field harmonic ground motion. The results demonstrate that the double-story isolated structure can extend the structural period further than the base isolated structure under three types of ground motions. The double-story isolated structure exhibits lower base shear, inter-story displacement, base isolated layer displacement, story shear, and maximum acceleration of the top layer, compared to the base isolated structure. In addition, the double-story isolated structure generates fewer plastic hinges in the frame, causes less damage to the core tube, and experiences smaller overturning moments, demonstrating excellent resistance to overturning and a shock-absorbing effect. As the upper isolated layer is positioned higher, the compressive stress on the isolated bearings of the upper isolated layer in the double-story isolated structure gradually decreases. Moreover, the compressive stress on the isolated bearings of the base isolated layer is lower compared to that of the base isolated structure. However, the shock-absorbing capacity of the double-story isolated structure is significantly increased when the upper isolated layer is located in the middle and lower section. Notably, in regions exposed to long-period ground motion, a double-story isolated structure can experience greater seismic response and reduced shock-absorbing capacity, which may be detrimental to the structure.

Keywords

Acknowledgement

The writers gratefully acknowledge the financial support of National Natural Science Fund of China (No.52168072, No.51808467), High-level Talent Support Project of Yunnan Province, China (2020).

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