Fragility Evaluation in Building-Piping Systems: Effect of Piping Interaction with Buildings

[+] Author and Article Information
Yonghee Ryu

Ph.D, Department of Civil Engineering, North Carolina State University, Raleigh, NC 27695

Abhinav Gupta

Professor, Department of Civil Engineering, North Carolina State University, Raleigh, NC 27695

Ju Bu Seog

Professor, Department of Civil Engineering, Kyung Hee University, Yongin, Gyeonggi-do, 17104, Korea; Department of Civil Engineering, North Carolina State University, Raleigh, NC 27695

1Corresponding author.

ASME doi:10.1115/1.4039004 History: Received August 14, 2017; Revised December 26, 2017


Many studies assessing the damage from 1971 San Fernando and 1994 North Ridge earthquakes reported that the failure of non-structural 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, mid-rise, 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 the 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 the 8-story building that is nearly tuned with the piping system, the critical locations for both the linear frame and nonlinear models are the 3rd and 4th floors. It is observed that building nonlinearity can reduce fragility due to reduction in the tuning between building and piping systems. In the 2-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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