Experimental data on seismic response of piping
- G C Slagis Associates, Walnut Creek, CA (United States)
Displacement-controlled, sinusoidal vibration tests were performed on one-inch to four-inch diameter pipe segments. Straight pipe segments; straight pipe with a local reduced wall thickness; double spans; pipe segments with back-to-back flanges, socket welds, and elbows were tested at the Berkeley Nuclear Laboratories. Test results demonstrate that, within the limits of the test parameters, pipe spans will not collapse at extreme levels of dynamic loading. Extreme, in this case, means input levels as much as 16 times the Section III Level D allowable of 3 S{sub m} or 2S{sub y}. Material ductility limits the response to levels such that the fatigue damage from one seismic event of ten equivalent maximum stress cycles should be insignificant if the pressure is limited to the design pressure of 2/3 S{sub y}. The cyclic life of austenitic pipe is superior to that of carbon steel. The fundamental frequency of the pipe span has a significant effect on pipe response. The lower the frequency, the greater the acceleration response at the same input acceleration. The lowest frequency tested was 5 Hz. Dramatic levels of material dynamic strain hardening were noted.
- OSTI ID:
- 170336
- Report Number(s):
- CONF-950740--; ISBN 0-7918-1343-6
- Country of Publication:
- United States
- Language:
- English
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