<p>The conventional frame staging, where columns encircled alongside the perimeter of a circle, is a prevalent approach for supporting container of elevated water tanks (EWTs). Besides this conventional method, various alternative arrangements, involving additional structural elements such as beams, columns, and bracing, are also employed in practical applications. This study seeks to assess the seismic vulnerability of RC frame staging EWTs designed and detailed according to relevant Indian codes but utilizing different arrangements of supporting RC frame staging. Three EWTs, each with capacities of 1000 m<sup>3</sup> and 2000 m<sup>3</sup>, and featuring distinct patterns of supporting RC staging, are subjected to analysis using non-linear pushover analysis to derive pushover curves. The study evaluates and compares the response reduction (R) factor of EWTs with different supporting staging patterns against the values specified in the relevant codes. The seismic vulnerability of water tanks is evaluated using fragility analysis at four predefined damage states. The results show that the ductility factor and R factor are markedly influenced by the staging pattern of the tank. The study reveals that EWTs with bracing as well as radial beams and bracing showed less fragility as compared to basic and other configurations at severe and complete damage state.</p>

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Seismic vulnerability and fragility assessment of elevated water tanks with diverse staging frame patterns

  • Dhaval Bhalani,
  • Kaushik Gondaliya,
  • Jignesh Amin

摘要

The conventional frame staging, where columns encircled alongside the perimeter of a circle, is a prevalent approach for supporting container of elevated water tanks (EWTs). Besides this conventional method, various alternative arrangements, involving additional structural elements such as beams, columns, and bracing, are also employed in practical applications. This study seeks to assess the seismic vulnerability of RC frame staging EWTs designed and detailed according to relevant Indian codes but utilizing different arrangements of supporting RC frame staging. Three EWTs, each with capacities of 1000 m3 and 2000 m3, and featuring distinct patterns of supporting RC staging, are subjected to analysis using non-linear pushover analysis to derive pushover curves. The study evaluates and compares the response reduction (R) factor of EWTs with different supporting staging patterns against the values specified in the relevant codes. The seismic vulnerability of water tanks is evaluated using fragility analysis at four predefined damage states. The results show that the ductility factor and R factor are markedly influenced by the staging pattern of the tank. The study reveals that EWTs with bracing as well as radial beams and bracing showed less fragility as compared to basic and other configurations at severe and complete damage state.