Report No.: CCEER-05-5

Title: Experimental Evaluation of the Seismic Performance of Hospital Piping Subassemblies

Authors: Elliott Goodwin, Emmanuel Maragakis, Ahmad Itani and Shen-Yi Luo

Date: February 2005

Sponsoring Agency: Multidisciplinary Center for Earthquake Engineering Research (MCEER)

Performing Organization:
Department of Civil Engineering/258
University of Nevada, Reno
Reno, NV 89557

Abstract:

Two piping subassemblies with identical geometries were tested in the Large Scale Structures Laboratory at the University of Nevada, Reno. The experimental piping subassembly was modeled after a typical subassembly in a California hospital. The two subassemblies differed only by their connection details. One subassembly had welded connections; the other had threaded connections. The welded and threaded subassemblies were then tested with and without seismic bracing. The braced welded subassembly was subjected to story drifts up to 4.34% with no damage. The braced threaded subassembly began to leak at 2.17% and failed at 4.34%. The unbraced welded subassembly was subjected to story drifts up to 4.34% with no damage. The unbraced threaded subassembly began to leak at 1.08% story drift. The welded piping subassemblies exceed the 1997 UBC requirements on drift. The threaded piping systems do not meet the 1997 UBC requirement on drift without sustaining damage.