Earthquakes and Structures

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Seismic performance assessments of precast energy dissipation shear wall structures under earthquake sequence excitations

  • Zhang, Hao (School of Civil Engineering, Shenyang Jianzhu University) ;
  • Li, Chao (State Key Lab. of Coastal Offshore Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology) ;
  • Wang, Zhi-Fang (School of Civil Engineering, Shenyang Jianzhu University) ;
  • Zhang, Cai-Yan (State Key Lab. of Coastal Offshore Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology)
  • Received : 2019.09.04
  • Accepted : 2019.11.19
  • Published : 2020.02.25
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Abstract

This paper presents a novel precast energy dissipation shear wall (PEDSW) structure system that using mild steel dampers as dry connectors at the vertical joints to connect adjacent wall panels. Analytical studies are systematically conducted to investigate the seismic performance of the proposed PEDSW under sequence-type ground motions. During earthquake events, earthquake sequences have the potential to cause severe damage to structures and threaten life safety. To date, the damage probability of engineering structures under earthquake sequence has not been included in structural design codes. In this study, numerical simulations on single-story PEDSW are carried out to validate the feasibility and reliability of using mild steel dampers to connect the precast shear walls. The seismic responses of the PEDSW and cast-in-place shear wall (CIPSW) are comparatively studied based on nonlinear time-history analyses, and the effectiveness of the proposed high-rise PEDSW is demonstrated. Next, the foreshock-mainshock-aftershock type earthquake sequences are constructed, and the seismic response and fragility curves of the PEDSW under single mainshock and earthquake sequences are analyzed and compared. Finally, the fragility analysis of PEDSW structure under earthquake sequences is performed. The influences of scaling factor of the aftershocks (foreshocks) to the mainshocks on the fragility of the PEDSW structure under different damage states are investigated. The numerical results reveal that neglecting the effect of earthquake sequence can lead to underestimated seismic responses and fragilities, which may result in unsafe design schemes of PEDSW structures.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, Natural Science Foundation of Liaoning Province

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