Buy article PDF
The purchased file will be sent to you
via email after the payment is completed.
US$ 35
|
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 | ||