The response of a piping system to extreme seismic conditions may be controlled and limited by yielding of the structure. The effect of yielding has been found to be decisive for individual components, but for complex systems, the effect of yielding may be either important or negligible, depending on the specific geometry. Analytical and experimental tests are reviewed. The L test is devised to give an indication of the response characteristics of the system. It has been found that a parameter related to the frequency shift is capable of reasonably predicting the effect of yielding.
Issue Section:
Technical Papers
1.
Lazzeri
, L.
, 1987
, “The Design of Piping in Plastic Conditions Under Dynamic Load
,” Int. J. Pressure Vessels Piping
, 30
, pp. 351
–365
.2.
Lazzeri, L., 1988, “Effects of Plasticity on Dynamic Response of Piping Structures,” ASME J. Pressure Vessel Technol., 110.
3.
Lazzeri
, L.
, and Scala
, M.
, 1989
, “Equivalent Damping in Piping due to Local Vielding
,” ASME J. Pressure Vessel Technol.
, 111
, pp. 337
–342
.4.
Lazzeri, L., 1999, “Piping Analysis with MATHCAD PAM,” Ansaldo doc TR9801 rev 3.10, mar.
5.
Lazzeri, L., 1999, “Some Considerations About the Seismic Analysis of Piping Under Extreme Loading Conditions—Part III: Design,” ASME PVP Conference, Boston, MA.
6.
Iwan, W. D., 1980, “Estimate Inelastic Response Spectra From Elastic Spectra,” Earthquake Eng. Struct. Dyn., 8.
7.
Slagis
, G.
, 1998
, “Experimental Data on Seismic Response of Piping Components
,” ASME J. Pressure Vessel Technol.
, 120
, Nov
Nov
.8.
Slagis, G., 1999, “Piping Seismic Margins,” ASME PVP-Vol. 387.
9.
Jaquay, K., 1998 ‘Results and findings of the NRC Seismic Analysis of piping program’ ASME PVP Conference, San Diego, CA.
10.
Beaney, E. M., 1987, “The Response of Pipes to Seismic Loading” Trans. 9 SMIRT Conf., Lausanne, Switzerland, p. 805.
11.
Slagis, G., 1997, “Evaluation of Seismic Response Data for Piping,” Weld. Res. Counc. Bull., 423.
12.
Clough, R., and Penzien, J., 1993 Dynamics of Structures 2nd Edition, McGraw-Hill, New York, NY, p. 232.
13.
Timoshenko, S. P., and Goodier, J. N. 1987, Theory of Elasticity McGraw-Hill Reissue as Classical Textbook, pp. 284,288.
14.
Kussmaul, K., Diem, H., and Blind, D., 1987, “Investigation of the Plastic Behavior of Pipe Bends,” ASME PVP 127, p. 55.
Copyright © 2001
by ASME
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