Session: SE-09-01 Advanced Seismic Evaluation and Code (Joint session with C&S)

Paper Number: 154457

154457 - Seismic Response of L-Shaped Piping System Supported by Elasto-Plastic Dampers Subjected to Artificial Seismic Waves Using Spectral Matching 

Abstract: 

Response behaviors of an L-shaped piping system subjected to artificial earthquake inputs are investigated based on probability theory. The L-shaped piping system has a mass at the free end which means a valve or structure ahead. The L-shaped piping system is modeled by ten elements and eleven mass points including tip mass. The piping system is supported by two elasto-plastic dampers to mitigate the vibration.
Three types of the target acceleration response spectra based on Japanese Building Standards Law are introduced. Three types of nonstationary artificial waves are obtained by applying spectral matching to a set of time-weighted white noises based on these target acceleration response spectra. These waves are made by the software SeismoMatch.
Three types of artificial seismic waves are input to piping at the fixed end and the responses of displacement and stress of piping are calculated. We focus on averaged maximum displacement and maximum stress at each node of piping. It is investigated what type inputs deteriorate the response of a structure. To evaluate the responses, two evaluation indices are introduced: one is dynamic reliability of piping based on allowable stress, the other is energy absorption ratio of two elasto-plastic dampers. Using these indices, the differences of seismic responses of piping subjected to these artificial seismic waves are discussed. Furthermore, optimal positions of two elasto-plastic dampers based on these indices are also investigated.

Presenting Author: Atsuhiko Shintani Osaka Metropolitan University

Presenting Author Biography: Atsuhiko Shintani received the Doctoral degree at Kyoto Institute of Technology in Japan in 1997.
He is currently Professor in Osaka Metropolitan University in Japan.
His research areas are vibration engineering, seismic engineering, flow-induced vibration, stability of dynamic system, application of vibration, human engineering, and so on.

Authors:

Taiki Sekoguchi Osaka Metropolitan Univ.
Atsuhiko Shintani Osaka Metropolitan University
Tomohiro Ito Independent Author
Chihiro Nakagawa Osaka Metropolitan Univ.