Water is the lifeline of humankind which is treated and stored in overhead tanks to fulfill the water demand of a settlement area. Generally in an urban area to store high-volume water, it is preferred to construct an Intze type overhead tank that fulfills the demand for drinking water as well as water demand for fire fighting systems, industries, commercial hubs, etc. It has been seen in the past that structural damage to elevated tanks has occurred due to earthquakes which have lost not only the infrastructure but also the lives of inhabitants nearby. In this study, the Intze Elevated Water Tank (EWT) of capacity 3.15 lakh liters is analysed and designed with 3 stage level with conventional frame type staging and is been compared with different types of bracing systems (diagonal, X, V, inverted V bracing systems), diagrid column system, and core shaft system under the medium soil condition in seismic zone IV. The analysis is carried out using the response spectrum and time history method using ETABS for lateral displacement, storey drift, and storey shear for tank full and empty condition cases. The time history is been computed for the convection mode with Bhuj earthquake data, which involves the sloshing motion of the liquid mass in the upper portion of intze EWT. At the end of the study, it was found that the X bracing, diagrid column, and core shaft system imparts 81.47%, 61.53%, and 89.35% less displacement respectively, and 77.73%, 69.68%, and 83.82% less oscillation period respectively in comparison with conventional frame type staging system. The study concluded that the X bracing system or diagrid column system can be proposed for construction in earthquake zone IV.

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Seismic Evaluation of Intz Elevated Water Tank for Different Bracing System, Diagrid Structure and Shaft Structure

  • Kiran Hubli,
  • Shivanand Mendigeri,
  • Tejas Doshi,
  • Nikhil Jambhale,
  • Veerendrakumar Khed,
  • Shubham Malji

摘要

Water is the lifeline of humankind which is treated and stored in overhead tanks to fulfill the water demand of a settlement area. Generally in an urban area to store high-volume water, it is preferred to construct an Intze type overhead tank that fulfills the demand for drinking water as well as water demand for fire fighting systems, industries, commercial hubs, etc. It has been seen in the past that structural damage to elevated tanks has occurred due to earthquakes which have lost not only the infrastructure but also the lives of inhabitants nearby. In this study, the Intze Elevated Water Tank (EWT) of capacity 3.15 lakh liters is analysed and designed with 3 stage level with conventional frame type staging and is been compared with different types of bracing systems (diagonal, X, V, inverted V bracing systems), diagrid column system, and core shaft system under the medium soil condition in seismic zone IV. The analysis is carried out using the response spectrum and time history method using ETABS for lateral displacement, storey drift, and storey shear for tank full and empty condition cases. The time history is been computed for the convection mode with Bhuj earthquake data, which involves the sloshing motion of the liquid mass in the upper portion of intze EWT. At the end of the study, it was found that the X bracing, diagrid column, and core shaft system imparts 81.47%, 61.53%, and 89.35% less displacement respectively, and 77.73%, 69.68%, and 83.82% less oscillation period respectively in comparison with conventional frame type staging system. The study concluded that the X bracing system or diagrid column system can be proposed for construction in earthquake zone IV.