Seismic Performance of Existing Water Tank after Condition Position Using Non-Destructive Testing

Structural Engineering

There has been a combined attempt to address the seismic performance of existing structures in India after an earthquake in Bhuj, Gujarat, in 2001. Seismic analysis and seismic retrofit for the existing tanks have become a remarkable problem to be worked since corrosion is a cosmopolitan and natural phenomenon. It is important to know the exact reason for suffering and type of distress. To succeed such problems, a proper technique of restoration and recovery with detailed plans and methodology is required. This research is targeted at evolving systematic investigation metrology for condition position method based on the analytical hierarchy process (AHP) and strengthening by various retrofitting strategies. For that case study, an existing raised water tank is considered, which was designed according to state of the art over 40 years ago as per old Indian Standard (IS) code. The position assessment of the raised service tank was carried out using different non-destructive tests (NDTs). DER, i.e., degree (D), extent (E) and relevancy (R) rating technique was employed to find out the condition index of the elevated service tank (ESR). After finding the condition ranking of the existing structure, an analysis was carried out using SAP 2000 to find the present-day seismic requirements using IS codes. After knowing the seismic demand of the water tank, various retrofitting methods were adopted for improving the drift capacity and flexural capacity of the structure. The results were finally used to discourse some of the critical problems of the seismic response of the retrofitted structure in terms of a time period, mode shapes, base shear, displacement, acceleration, and velocity. From the case study result of seismic retrofit for the existing raised water tank, it is confirmed that a relatively simple seismic retrofit method is effective to keep the tank functional after an earthquake.

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