Seismic performance of shaft type staging elevated water tanks with and without shear deformation

Abstract

This paper compares the seismic analysis of Intz shape shaft type elevated liquid storage tanks with and without considering shear deformation along with flexural deformations  of capacity 250m³,500m³ and1000m³ in accordance with IS: 1893- (Part-2) 2014. To study the effect of shear deformation of staging, on seismic performance of elevated liquid storage tank (assumed liquid as water). The analysis is carried out for elevated liquid storage tanks of shape Intz in seismic zone-V and on the hard soil type with two different tank-fill conditions - tank full and tank empty. Further, three different staging heights are also considered in this study. A Programme is formulated in Microsoft Excel software package using IS: 1893- (Part-2) 2014 and GSDMA (Gujarat State Disaster Management Authority) guidelines. The parameters of comparison include natural time period, lateral stiffness, base shear, base moment at the base of staging. The present study will be helpful to Civil Engineers to understand the effect of shear deformation of staging on seismic performance of elevated liquid storage tanks. 

Keywords: Elevated liquid storage tank, IS: 1893- (Part-2) 2014, shear deformation of staging, staging height capacity, seismic analysis.