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Structural Engineering and Mechanics
  Volume 67, Number 6, September25 2018 , pages 587-601
DOI: https://doi.org/10.12989/sem.2018.67.6.587
 


Damage states of yielding and collapse for elevated water tanks supported on RC frame staging
Suraj O. Lakhade, Ratnesh Kumar and Omprakash R. Jaiswal

 
Abstract
    Elevated water tanks are inverted pendulum type structures where drift limit is an important criterion for seismic design and performance evaluation. Explicit drift criteria for elevated water tanks are not available in the literature. In this study, probabilistic approach is used to determine maximum drift limit for damage state of yielding and damage state of collapse for the elevated water tanks supported on RC frame staging. The two damage states are defined using results of incremental dynamic analysis wherein a total of 2160 nonlinear time history analyses are performed using twelve artificial spectrum compatible ground motions. Analytical fragility curves are developed using two-parameter lognormal distribution. The maximum allowable drifts corresponding to yield and collapse level requirements are estimated for different tank capacities. Finally, a single fragility curve is developed which provides maximum drift values for the different probability of damage. Further, for rational consideration of the uncertainties in design, three confidence levels are selected and corresponding drift limits for damage states of yielding and collapse are proposed. These values of maximum drift can be used in performance-based seismic design for a particular damage state depending on the level of confidence.
 
Key Words
    incremental dynamic analysis; fragility analysis; elevated water tanks; drift limits; frame staging
 
Address
Suraj O. Lakhade, Ratnesh Kumar and Omprakash R. Jaiswal: Department of Applied Mechanics, Visvesvaraya National Institute of Technology, Nagpur-440 010, India
 

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