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Research Papers: Experimental Work

Experimental and Numerical Studies of Ratcheting in a Pressurized Piping System Under Seismic Load

[+] Author and Article Information
A. Ravikiran

Reactor Safety Division,
Bhabha Atomic Research Centre,
Mumbai 400 085, India
e-mail: arkiran@barc.gov.in

P. N. Dubey

Reactor Safety Division,
Bhabha Atomic Research Centre,
Mumbai 400 085, India
e-mail: pndubey@barc.gov.in

M. K. Agrawal

Reactor Safety Division,
Bhabha Atomic Research Centre,
Mumbai 400 085, India
e-mail: mkagra@barc.gov.in

G. R. Reddy

Reactor Safety Division,
Bhabha Atomic Research Centre,
Mumbai 400 085, India
e-mail: rssred@barc.gov.in

R. K. Singh

Reactor Safety Division,
Bhabha Atomic Research Centre,
Mumbai 400 085, India
e-mail: rksingh@barc.gov.in

K. K. Vaze

Reactor Design and Development Group,
Bhabha Atomic Research Centre,
Mumbai 400 085, India
e-mail: kkvaze@barc.gov.in

1Present address: SO/F, R. No. 407, Engg. Hall-7, BARC, Trombay, Mumbai 400085, India.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received February 6, 2014; final manuscript received September 17, 2014; published online March 25, 2015. Assoc. Editor: Reza Adibi-Asl.

J. Pressure Vessel Technol 137(3), 031011 (Jun 01, 2015) (7 pages) Paper No: PVT-14-1019; doi: 10.1115/1.4028619 History: Received February 06, 2014; Revised September 17, 2014; Online March 25, 2015

Rational seismic design procedures necessitate comprehensive evaluation of nuclear piping systems under large amplitude seismic loads. This comprehensive assessment requires accurate prediction of inelastic response of piping system till failure to ensure adequate margins for unexpected beyond design basis events. The present paper describes the details of experimental and numerical studies of inelastic response of pressurized piping system under seismic loading. Shake table test has been carried out on a three-dimensional stainless steel piping system under internal pressure and seismic load. The amplitude of base excitation has been increased till failure of the piping system. The tested piping system has been analyzed using iterative response spectrum (IRS) method for various levels of excitation. The comparison of numerical and experimental results is given in the paper.

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References

Figures

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Fig. 1

Test setup of the piping system

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Fig. 11

FE model of the elbow

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Fig. 12

Load line displacement time history at the free end of the pipe

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Fig. 13

Variation of moment with hoop strain at crown of elbow

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Fig. 14

Moment–rotation hysteresis loops for the elbow

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Fig. 10

Flow chart for fatigue–ratcheting evaluation of piping system

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Fig. 9

Strain history at weld location of elbow-1

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Fig. 8

Strain history at elbow-1

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Fig. 7

Photograph of crack at crown of elbow-1

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Fig. 6

Photograph of water jet through elbow-1

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Fig. 5

Test input spectrum in Y-direction (vertical, 100% TRS)

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Fig. 4

Test input spectrum in Z-direction (horizontal, 100% TRS)

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Fig. 3

Test input spectrum in X-direction (horizontal, 100% TRS)

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Fig. 2

FE model of the piping system

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Fig. 15

Cyclic strain–moment–rotation curves

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Fig. 16

FE model of the piping system by replacing elbow with springs

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Fig. 17

Various levels of IRS analysis on cyclic moment–rotation curve

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Fig. 18

Comparison of predicted strain accumulation with test results for first phase (incremental base excitation and constant pressure of 12 MPa)

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Fig. 19

Cyclic strain–moment curves for various internal pressures

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Fig. 20

Comparison of maximum predicted strain with test results for second phase (incremental pressure and constant base excitation of 2.5 g ZPA)

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