Experimental and numerical studies of inelastic behavior of thin walled elbow and tee joint under seismic load

In the present work, experimental and numerical studies are carried out on inelastic behavior of thin walled elbow and tee joint under incremental seismic load, with an emphasis on fatigue-ratcheting. Initially, a short radius carbon steel (SA106 Gr B) elbow is subjected to internal pressure and inc...

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Bibliographic Details
Published inThin-walled structures Vol. 127; pp. 700 - 709
Main Authors Kiran, A. Ravi, Reddy, G.R., Agrawal, M.K.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.06.2018
Subjects
Elbow
Fatigue-Ratcheting
Iterative Response Spectrum method
Seismic load
Shake table test
Tee joint
Wavelet analysis
Wavelet analysis
Tee joint
Iterative Response Spectrum method
Fatigue-Ratcheting
Shake table test
Elbow
Seismic load
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Summary:In the present work, experimental and numerical studies are carried out on inelastic behavior of thin walled elbow and tee joint under incremental seismic load, with an emphasis on fatigue-ratcheting. Initially, a short radius carbon steel (SA106 Gr B) elbow is subjected to internal pressure and incremental seismic excitation till failure. The tested elbow is analyzed using a simplified method to evaluate ratcheting and compared with test results. Simulations are carried out with uniform and actual thickness distribution to study the variation in strain accumulation. Later, a tee joint of same material and size is studied under similar loading conditions till failure. The resulting strain accumulation in elbow and tee joint are compared. The change in natural frequencies of elbow and tee during the test are evaluated using wavelet analysis and the details are provided in the paper. •Experimental study of fatigue-ratcheting is carried out for thin walled elbow and tee joint under internal pressure and incremental seismic loading till failure.•Analysis of the tested elbow is carried out using simplified method called Iterative Response Spectrum method.•It is observed that predominant failure mode for pressurized elbow and tee joint under seismic load is ratcheting dominant fatigue-ratcheting and fatigue respectively.•Wavelet analysis has been carried out to determine the frequency change of the components during testing.
ISSN:0263-8231
1879-3223
DOI:10.1016/j.tws.2018.03.010