Structural Engineering and Mechanics

  • 제62권2호
  • /
  • Pages.209-224
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  • 2017
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  • 1225-4568(pISSN)
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  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Estimation of response reduction factor of RC frame staging in elevated water tanks using nonlinear static procedure

  • Lakhade, Suraj O. (Department of Applied Mechanics, Visvesvaraya National Institute of Technology) ;
  • Kumar, Ratnesh (Department of Applied Mechanics, Visvesvaraya National Institute of Technology) ;
  • Jaiswal, Omprakash R. (Department of Applied Mechanics, Visvesvaraya National Institute of Technology)
  • 투고 : 2016.07.24
  • 심사 : 2017.01.10
  • 발행 : 2017.04.25
⟨ 이전 논문 다음 논문 ⟩

초록

Elevated water tanks are considered as important structures due to its post-earthquake requirements. Elevated water tank on reinforced concrete frame staging is widely used in India. Different response reduction factors depending on ductility of frame members are used in seismic design of frame staging. The study on appropriateness of response reduction factor for reinforced concrete tank staging is sparse in literature. In the present paper a systematic study on estimation of key components of response reduction factors is presented. By considering the various combinations of tank capacity, height of staging, seismic design level and design response reduction factors, forty-eight analytical models are developed and designed using relevant Indian codes. The minimum specified design cross section of column as per Indian code is found to be sufficient to accommodate the design steel. The strength factor and ductility factor are estimated using results of nonlinear static pushover analysis. It was observed that for seismic design category 'high' the strength factor has lesser contribution than ductility factor, whereas, opposite trend is observed for seismic design category 'low'. Further, the effects of staging height and tank capacity on strength and ductility factors for two different seismic design categories are studied. For both seismic design categories, the response reduction factors obtained from the nonlinear static analysis is higher than the code specified response reduction factors. The minimum dimension restriction of column is observed as key parameter in achieving the desired performance of the elevated water tank on frame staging.

키워드

참고문헌

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