Many studies assessing the damage from 1971 San Fernando and 1994 North Ridge earthquakes reported that the failure of nonstructural components like piping systems was one of the significant reasons for shutdown of hospitals immediately after the earthquakes. This paper is focused on evaluating seismic fragility of a large-scale piping system in representative high-rise, midrise, and low-rise buildings using nonlinear time history analyses. The emphasis is on evaluating piping's interaction with building and its effect on piping fragility. The building models include the effects of nonlinearity in the performance of beams and columns. In a 20-story building that is detuned with the piping system, critical locations are on the top two floors for the linear frame building model. For the nonlinear building model, critical locations are on the bottom two floors. In an eight-story building that is nearly tuned with the piping system, the critical locations for both the linear frame and nonlinear models are the third and fourth floors. It is observed that building nonlinearity can reduce fragility due to reduction in the tuning between building and piping systems. In a two-story building, the nonlinear building frequencies are closer to the critical piping system frequencies than the linear building frequency; the nonlinear building is more fragile than the linear building for this case. However, it is observed that the linear building models give excessively conservative estimates of fragility than the nonlinear building models.
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February 2019
Research-Article
Fragility Evaluation in Building-Piping Systems: Effect of Piping Interaction With Buildings
Yong Hee Ryu,
Yong Hee Ryu
Department of Civil Engineering,
North Carolina State University,
Raleigh, NC 27695
e-mail: yryu@ncsu.edu
North Carolina State University,
Raleigh, NC 27695
e-mail: yryu@ncsu.edu
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Abhinav Gupta,
Abhinav Gupta
Professor
Department of Civil Engineering,
North Carolina State University,
Raleigh, NC 27695
e-mail: agupta1@ncsu.edu
Department of Civil Engineering,
North Carolina State University,
Raleigh, NC 27695
e-mail: agupta1@ncsu.edu
Search for other works by this author on:
Bu Seog Ju
Bu Seog Ju
Professor
Department of Civil Engineering,
Kyung Hee University,
Yongin, Gyeonggi-do 17104, South Korea;
Department of Civil Engineering,
Kyung Hee University,
Yongin, Gyeonggi-do 17104, South Korea;
Department of Civil Engineering,
North Carolina State University,
Raleigh, NC 27695
e-mail: bju2@khu.ac.kr
North Carolina State University,
Raleigh, NC 27695
e-mail: bju2@khu.ac.kr
Search for other works by this author on:
Yong Hee Ryu
Department of Civil Engineering,
North Carolina State University,
Raleigh, NC 27695
e-mail: yryu@ncsu.edu
North Carolina State University,
Raleigh, NC 27695
e-mail: yryu@ncsu.edu
Abhinav Gupta
Professor
Department of Civil Engineering,
North Carolina State University,
Raleigh, NC 27695
e-mail: agupta1@ncsu.edu
Department of Civil Engineering,
North Carolina State University,
Raleigh, NC 27695
e-mail: agupta1@ncsu.edu
Bu Seog Ju
Professor
Department of Civil Engineering,
Kyung Hee University,
Yongin, Gyeonggi-do 17104, South Korea;
Department of Civil Engineering,
Kyung Hee University,
Yongin, Gyeonggi-do 17104, South Korea;
Department of Civil Engineering,
North Carolina State University,
Raleigh, NC 27695
e-mail: bju2@khu.ac.kr
North Carolina State University,
Raleigh, NC 27695
e-mail: bju2@khu.ac.kr
1Corresponding author.
Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received August 14, 2017; final manuscript received December 26, 2017; published online December 14, 2018. Assoc. Editor: Fabrizio Paolacci.
J. Pressure Vessel Technol. Feb 2019, 141(1): 010906 (13 pages)
Published Online: December 14, 2018
Article history
Received:
August 14, 2017
Revised:
December 26, 2017
Citation
Hee Ryu, Y., Gupta, A., and Seog Ju, B. (December 14, 2018). "Fragility Evaluation in Building-Piping Systems: Effect of Piping Interaction With Buildings." ASME. J. Pressure Vessel Technol. February 2019; 141(1): 010906. https://doi.org/10.1115/1.4039004
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