Experimental Study of Mechanical Pipe Snubber Seismic Behavior

Author:

Nims D. K.1,Kelly J. M.2

Affiliation:

1. Department of Civil Engineering, University of Toledo, Toledo, OH 43606-3390

2. Earthquake Engineering Research Center, University of California, Berkeley, Berkeley, CA 94804

Abstract

A series of seismic tests of mechanical snubbers on a full-scale model piping system provided a unique opportunity for detailed scrutiny of snubber seismic behavior on an actual piping system. The observed snubber behavior is a complicated pattern of braking and releasing, drag and drift, and the dynamic characteristics of the snubber, as well as the input motion, play a role in the response of the snubber. The snubbers were effective in limiting pipe displacements. Relative accelerations across the snubber were larger than expected. Snubber hysteretic behavior was irregular. Results from this testing are important in understanding snubber behavior, evaluating snubber performance, and in assessing alternatives to snubbers.

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Safety, Risk, Reliability and Quality

Reference16 articles.

1. Bush, S. H., Heasler, P. G., and Dodge, R. E., 1982, “Aging and Service Wear of Hydraulic and Mechanical Snubbers Used on Safety-Related Piping and Components of Nuclear Power Plants. Phase I: Study,” NUREG/CR-4279, PNL-5479, Vol. 1, RM, RV, U.S. NRC.

2. Flade, D., Jehlicka, P., Kot, A., Malcher, L., Schrammel, D., and Steinhilber, H., 1988, “HDR-Sichereitsprogramm, Earthquake Experiments in the Reactor Building, Quick Look Report, SHAG Experiments, Kernforschungszentrum Karsruhe Technical Report 71 E-87.

3. Godden, W. G., Schneider, S., and Lee, H. M., 1982, “Experimental Behavior of a Spatial Piping System with Shock Arrestors and Energy Absorbers Under Seismic Excitation (Preliminary Test Results),” Earthquake Engineering Research Center, University of California, Berkeley, CA.

4. Howard, G. E., Walton, W. B., and Johnson, B. A., 1985, “High-Amplitude Dynamic Tests of Prototypical Nuclear Piping Systems,” Report No. EPRI NP-3916, Research Project 964-9, Electric Power Research Institute, Palo Alto, CA.

5. Kelly, J. M., Cowell, A. D., and Schweizerhof, K., 1987, “Experimental Studies of Multi-Support Seismic Loading on Piping Systems,” Electric Power Research Institute Report EPRI N-4865.

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