Earthquakes and Structures

  • 제21권5호
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  • Pages.477-487
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  • 2021
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  • 2092-7614(pISSN)
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  • 2092-7622(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Influence of strong ground motion duration on reinforced concrete walls

  • Flores, Camilo (Departamento de Obras Civiles, Universidad Tecnica Federico Santa Maria) ;
  • Bazaez, Ramiro (Departamento de Obras Civiles, Universidad Tecnica Federico Santa Maria) ;
  • Lopez, Alvaro (Escuela de Ingenieria Civil, Pontificia Universidad Catolica de Valparaiso)
  • 투고 : 2021.03.12
  • 심사 : 2021.07.13
  • 발행 : 2021.11.25
⟨ 이전 논문 다음 논문 ⟩

초록

This study focuses on the influence of strong ground motion duration on the response and collapse probability of reinforced concrete walls with a predominant response in flexure. Walls with different height and mass were used to account for a broad spectrum of configurations and fundamental periods. The walls were designed following the specifications of the Chilean design code. Non-linear models of the reinforced concrete walls using a distributed plasticity approach were performed in OpenSees and calibrated with experimental data. Special attention was put on modeling strength and stiffness degradation. The effect of duration was isolated using spectrally equivalent ground motions of long and short duration. In order to assess the behavior of the RC shear walls, incremental dynamic analyses (IDA) were performed, and fragility curves were obtained using cumulative and non-cumulative engineering demand parameters. The spectral acceleration at the fundamental period of the wall was used as the intensity measure (IM) for the IDAs. The results show that the long duration ground motion set decreases the average collapse capacity in walls of medium and long periods compared to the results using the short duration set. Also, it was found that a lower median intensity is required to achieve moderate damage states in the same medium and long period wall models. Finally, strength and stiffness degradation are important modelling parameters and if they are not included, the damage in reinforced concrete walls may be greatly underestimated.

키워드

과제정보

The authors gratefully acknowledge the support of the Universidad Tecnica Federico Santa Maria

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