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Earthquakes and Structures
  Volume 9, Number 3, September 2015 , pages 563-576

Effect of MDOF structures' optimal dampers on seismic fragility of piping
Woo Young Jung and Bu Seog Ju

    Over the past few decades, seismic retrofitting of structural systems has been significantly improved by the adoption of various methods such as FRP composite wraps, base isolation systems, and passive/active damper control systems. In parallel with this trend, probabilistic risk assessment (PRA) for structural and nonstructural components has become necessary for risk mitigation and the achievement of reliable designs in performance-based earthquake engineering. The primary objective of the present study was to evaluate the effect on piping fragility at T-joints due to seismic retrofitting of structural systems with passive energy-dissipation devices (i.e., linear viscous dampers). Three mid-rise building types were considered: without any seismic retrofitting; with distributed damper systems; with optimal placement of dampers. The results showed that the probability of piping system failure was considerably reduced in a Multi Degree of Freedom (MDOF) building retrofitted with optimal passive damper systems at lower floor levels. This effect of damper systems on piping fragility became insignificant as the floor level increased.
Key Words
    passive dampers; piping; fragility; SSSA; earthquake
Woo Young Jung: Department of Civil Engineering, GangNeung-WonJu National University, GangNeung, Korea

Bu Seog Ju: Department of Civil Engineering, North Carolina State University, Raleigh, USA

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