In pressurized piping systems, strain accumulation may take place due to cyclic loading during a seismic event. This incremental plastic deformation called ratcheting may lead to failure of the piping systems. There is no numerical method available to evaluate this accumulated strain in the piping system using response spectrum as input. In the literature, incremental hinge technique is available to predict the failure level conservatively by considering static collapse as the failure mode. However, it is observed from shake table tests that failure in the piping components, especially in elbows, is due to ratcheting. Considering this failure mode and design input as a response spectrum, a modified incremental hinge technique is developed and validated with experimental results. The strain predicted by this analysis closely matches with that of experimental results which are available up to an excitation of 0.75 g ZPA (zero period acceleration). In the experiment, the pressure boundary rupture occurred at 2 g ZPA, while the analysis predicts the failure of the piping system at 2.37 g ZPA. Details of these investigations are presented in the paper.
Evaluation of Inelastic Seismic Response of a Piping System Using a Modified Iterative Response Spectrum Method
Contributed by the Pressure Vessel and Piping Division of ASME for publication in the Journal of Pressure Vessel Technology. Manuscript received May 21, 2012; final manuscript received January 24, 2013; published online June 11, 2013. Assoc. Editor: Chong-Shien Tsai.
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Ravikiran, A., Dubey, P. N., Agrawal, M. K., Reddy, G. R., and Vaze, K. K. (June 11, 2013). "Evaluation of Inelastic Seismic Response of a Piping System Using a Modified Iterative Response Spectrum Method." ASME. J. Pressure Vessel Technol. August 2013; 135(4): 041801. https://doi.org/10.1115/1.4023730
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