The damping coefficients and ratios of piping system snubber supports were found to vary logarithmically with pipe support nodal displacement. For piping systems with fundamental frequencies in the range of 0.6 to 6.6 Hz, the support damping ratio for snubber supports was found to increase with increasing fundamental frequency. For 3-kip snubbers, damping coefficient and damping ratio decreased logarithmically with nodal displacement, indicating that the 3-kip snubbers studied behaved essentially as coulomb dampers; while for the 10-kip snubbers studied, damping coefficient and damping ratio increased logarithmically with nodal displacement.

1.
Anderson
M. J.
,
Barta
D. A.
,
Lindquist
M. R.
,
Renkey
E. J.
, and
Ryan
J. A.
,
1985
, “
Damping in LMFBR Pipe Systems
,”
ASME JOURNAL OF PRESSURE VESSEL TECHNOLOGY
, Vol.
107
, pp.
366
372
.
2.
ADLPIPE, 1980, Static and Dynamic Pipe Design and Stress analysis Input Preparation Manual, Arthur D. Little, Inc.
3.
Bergen Paterson, 1983, Test Report Number TRNHTL-1083-324A, Laconia, NH.
4.
Chiba, T., Kobayashi, H., Kitamura, K., Ando, K., and Koyanagi, R., 1983, “An Experimental Study on Damping Characteristics of Mechanical Snubbers for Nuclear Power Plant Piping Systems,” Transactions of the 7th International Conference on Structural Mechanics in Reactor Technology, Vol. K, pp. 311–318.
5.
Chiba
T.
, and
Kobayashi
H.
,
1985
, “
An Experimental Study on Damping Characteristics of Thermal Insulation
,” Seismic and Dynamic Qualification Methods,
ASME PVP
-Vol.
100
, pp.
17
23
.
6.
Cloud, R. W., 1974, “Damping Values of Nuclear Power Plant Components,” WCAP-7921-AR, Westinghouse Electric Corp.
7.
Cunningham
D. J.
,
Pickett
M. A.
,
Sinha
S. K.
, and
Madia
J.
,
1986
, “
Application of the Ritz Averaging Method in the Analysis of the Seismic Performance of Piping Systems
,” System and Component Design and Qualification Methods,
ASME PVP
-Vol.
117
, pp.
41
64
.
8.
Geraets
L. H.
,
1985
, “
Use of Full ZPA Method for the Seismic Response from Rigid Modes
,” Recent Advances in Seismic Design of Piping and Components,
ASME PVP
-Vol.
98-3
, pp.
61
67
.
9.
Hadjian
A. H.
,
Masri
S. F.
, and
Ellison
B.
,
1985
, “
Damping Variability in Piping Systems
,” Seismic and Dynamic Qualification Methods,
ASME PVP
-Vol.
100
, pp.
41
48
.
10.
Harrison, H. L., and Bollinger, J. G., 1969, Introduction to Automatic Controls, 2nd Edition, Harper & Row, New York, NY., pp. 187–192.
11.
Lay
C.
,
Abu-Yasein
O. A.
,
Pickett
M. A.
,
Sinha
S. K.
, and
Madia
J.
,
1992
, “
Establishment of an Improved Criteria for Snubber Functional Testing
,”
ASME PVP
-Vol.
237-2
, pp.
179
193
.
12.
Lockau
J.
,
Haas
E.
, and
Steinwender
F.
,
1984
, “
The Influence of High-Frequency Excitation on Piping and Support Design
,”
ASME JOURNAL OF PRESSURE VESSEL TECHNOLOGY
, Vol.
106
, pp.
177
187
.
13.
Pickett, M. A., and Gartner, J. R., 1981, “Development of Nonlinear Frequency and Load Dependent Models for Snubbers,” ASME Paper No. 81-WA/PVP-3.
14.
Pickett
M. A.
, and
Gartner
J. R.
,
1982
, “
Development of Nonlinear Frequency and Load Dependent Model for Velocity Sensitive Hydraulic Snubbers
,” Recent Advances in Pipe Support Design,
ASME PVP
-Vol.
68
, pp.
81
93
.
15.
Pickett
M. A.
,
1985
, “
Stiffness Sensitivity Study for Hydraulic Snubbers
,” Piping, Feedwater Heater Operations, and Pumps,
ASME PVP
-Vol.
98-9
, pp.
3
12
.
16.
Pickett
M. A.
,
Cunningham
D. J.
,
Sinha
S. K.
, and
Madia
J.
,
1987
, “
Application of the Ritz Averaging Method in the Analysis of the Seismic Performance of Piping Systems
,”
ASME JOURNAL OF PRESSURE VESSEL TECHNOLOGY
, Vol.
109
, pp.
315
322
.
17.
Pickett
M. A.
,
Abu-Yasein
O. A.
,
Sinha
S. K.
, and
Madia
J.
,
1988
, “
An Evaluation of the Axial Velocity Spectra of Piping System Snubbers
,” Seismic Engineering—1988,
ASME PVP
-Vol.
144
, pp.
169
179
.
18.
Scavuzzo
R. J.
,
Lam
P. C.
, and
Scavuzzo
S. A.
,
1985
, “
Damping of Pipes—Plastic Regime
,” Structural Dynamics,
ASME PVP
-Vol.
98-6
, pp.
185
191
.
19.
Seireg, A., 1969, Mechanical Systems Analysis, International Textbook Co., Scranton, PA, pp. 238–249.
20.
Ware, A. G., and Thinnes, G. L., 1984, “Damping Test Results for Straight Sections of 3-Inch and 8-Inch Unpressurized Pipes,” NUREG/CR-3722, EGG-2305, EG&G Idaho, Inc., pp. 1–32.
21.
Ware
A. G.
,
1985
, “
An Assessment of Frequency-Dependent Damping Using the Nuclear Piping System Damping Data Base
,”
ASME JOURNAL OF PRESSURE VESSEL TECHNOLOGY
, Vol.
107
, pp.
361
365
.
22.
Ware
A. G.
,
1986
, “
Variation of Structural Damping with Response Amplitude in Piping Systems
,” Seismic Engineering for Piping Systems, Tanks, and Power Plant Equipment,
ASME PVP
-Vol.
108
, pp.
13
18
.
23.
Ware
A. G.
,
1987
, “
Theoretical and Experimental Damping Values of Piping Systems at High Ductilities
,” SEISMIC ENGINEERING—Recent Advances in Design, Analysis, Testing and Qualification Methods,
ASME PVP
-Vol.
127
, pp.
237
246
.
24.
Ware
A. G.
,
1991
, “
The History of Allowable Damping Values for U.S. Nuclear Plant Piping
,”
ASME JOURNAL OF PRESSURE VESSEL TECHNOLOGY
, Vol.
113
, pp.
284
290
.
25.
Watabe, M., 1984, “Evaluation of Damping Ratios for Piping Systems,” NUREG/CP-0059, BNL-NUREG-51821, Vol. 1, pp. 361–381.
This content is only available via PDF.
You do not currently have access to this content.