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RESEARCH PAPERS

Passive Control of Seismic Response of Piping Systems

[+] Author and Article Information
Y. M. Parulekar, G. R. Reddy, K. K. Vaze

Reactor Safety Division, Bhabha Atomic Research Centre, Mumbai, India 400085

K. Muthumani

Structural Dynamics Laboratory, Structural Engineering Research Centre, Chennai, India 600113

J. Pressure Vessel Technol 128(3), 364-369 (Aug 30, 2005) (6 pages) doi:10.1115/1.2217969 History: Received February 24, 2004; Revised August 30, 2005

Passive energy dissipating devices, such as elastoplastic dampers (EPDs) can be used for eliminating snubbers and reducing the response of piping systems subjected to seismic loads. Cantilever and three-dimensional piping systems were tested with and without EPD on shaker table. Using a finite element model of the piping systems, linear and nonlinear time-history analysis is carried out using Newmark’s time integration technique. Equivalent linearization technique, such as Caughey method, is used to evaluate the equivalent damping of the piping systems supported on elastoplastic damper. An iterative response spectrum method is used for evaluating response of the piping system using this equivalent damping. The analytical maximum response displacement obtained at the elastoplastic damper support for the two piping systems is compared with experimental values and time history analysis values. It has been concluded that the iterative response spectrum technique using Caughey equivalent damping is simple and results in reasonably acceptable response of the piping systems supported on EPD.

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Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 6

Comparison of the test and analysis results of 3D piping system with 3mm X plate EPD

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Figure 7

(a) Comparison of experimental and theoretical force displacement curve for 3mm thick plate under static load and (b) bilinear force displacement hysteretic relation

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Figure 8

Flow chart of iterative response spectrum method

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Figure 9

Comparison of the displacement for cantilever piping system

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Figure 10

Comparison of the displacement for 3D piping system

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Figure 11

Variation of damping value with acceleration

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Figure 12

Comparison of displacements at EPD and damping ratio of the cantilever piping system at different iterations of IRS

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Figure 13

Comparison of displacements at EPD and damping ratio of the 3D piping system at different iterations of IRS

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Figure 5

Comparison of test and analysis results of cantilever piping system with 3mm X-plate EPD

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Figure 4

Acceleration response spectra

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Figure 3

Finite element model of cantilever pipe and 3D pipe

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Figure 2

(a) Cantilever piping system and (b) 3D piping system

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Figure 1

(a) Elastoplastic damper and (b) EPD schematic diagram

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