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Earthquakes and Structures
  Volume 14, Number 5, May 2018, pages 399-409
DOI: http://dx.doi.org/10.12989/eas.2018.14.5.399
 


The dynamic response and seismic damage of single-layer reticulated shells subjected to near-fault ground motions
Ming Zhang, Gerry Parke and Zhiwang Chang

 
Abstract
    The dynamic response and seismic damage of single-layer reticulated shells in the near field of a rupturing fault can be different from those in the far field due to the different characteristics in the ground motions. To investigate the effect, the dynamic response and seismic damage of this spatial structures subjected to two different ground motions were numerically studied by nonlinear dynamic response analysis. Firstly, twelve seismic waves with an apparent velocity pulse, including horizontal and vertical seismic waves, were selected to represent the near-fault ground motion characteristics. In contrast, twelve seismic records recorded at the same site from other or same events where the epicenter was far away from the site were employed as the far-fault ground motions. Secondly, the parametric modeling process of Kiewitt single-layer reticulated domes using the finite-element package ANSYS was described carefully. Thirdly, a nonlinear time-history response analysis was carried out for typical domes subjected to different earthquakes, followed by analyzing the dynamic response and seismic damage of this spatial structures under two different ground motions based on the maximum nodal displacements and Park-Ang index as well as dissipated energy. The results showed that this spatial structures in the near field of a rupturing fault exhibit a larger dynamic response and seismic damage than those obtained from far-fault ground motions. In addition, the results also showed that the frequency overlap between structures and ground motions has a significant influence on the dynamic response of the single-layer reticulated shells, the duration of the ground motions has little effects.
 
Key Words
    single-layer reticulated shells; near-fault ground motions; far-fault ground motions; nonlinear dynamic analysis; frequencies; duration
 
Address
Ming Zhang: School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
Gerry Parke: Department of Civil and Environmental Engineering, University of Surrey, Guildford GU2 7XH, UK
Zhiwang Chang: School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
 

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