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Fatigue-Ratcheting Behaviour of Six Inch Pressurized Carbon Steel Piping Systems under Seismic Load ? Experiments and Analysis

[+] Author and Article Information
A. Ravi Kiran

Reactor Safety Division, Bhabha Atomic Research Centre, Mumbai, India
arkiran@barc.gov.in

G. R. Reddy

Reactor Safety Division, Bhabha Atomic Research Centre, Mumbai, India
rssred@barc.gov.in

P. N. Dubey

Reactor Safety Division, Bhabha Atomic Research Centre, Mumbai, India
pndubey@barc.gov.in

M.K. Agrawal

Reactor Safety Division, Bhabha Atomic Research Centre, Mumbai, India
mkagra@barc.gov.in

1Corresponding author.

ASME doi:10.1115/1.4037809 History: Received May 19, 2017; Revised August 23, 2017

Abstract

This article presents the experimental and numerical studies of Fatigue-Ratcheting in carbon steel piping systems under internal pressure and earthquake load. Shake table tests are carried out on two identical six inch pressurized piping systems made of carbon steel of grade SA333 Gr 6. Tests are carried out using similar incremental seismic load till failure. Wavelet analysis is carried to evaluate frequency change during testing. The tested piping systems are analyzed using Iterative Response Spectrum method, which is based on Fatigue-Ratcheting and compared with test results. Effect of thickness variation in elbow on strain accumulation is studied. Excitation level for Fatigue-Ratcheting failure is also evaluated and the details are given in this paper.

Copyright (c) 2017 by ASME
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