Response of piping system with semi-active variable friction dampers under tri-directional seismic excitation

2013 ◽  
Vol 4 (3) ◽  
pp. 234
Author(s):  
Praveen Kumar ◽  
R.S. Jangid ◽  
G.R. Reddy
Keyword(s):  
Seismic Excitation ◽  
Piping System ◽  
Friction Dampers ◽  
Variable Friction

scholarly journals COMPARE THE EFFICIENCY OF CONTROLLED STIFFNESS DAMPER WITH VARIABLE FRICTION DAMPER FOR SEISMIC PROTECTION OF BUILDING

2009 ◽  
Vol 12 (8) ◽  
pp. 81-89
Author(s):  
Phuc Quang Bao Nguyen ◽  
Hoa Nhan Pham ◽  
Thang Quoc Chu
Keyword(s):  
Control Method ◽  
Seismic Protection ◽  
Control Law ◽  
Modal Control ◽  
Clamping Force ◽  
Friction Damper ◽  
Vibration Mitigation ◽  
Friction Dampers ◽  
Advantages And Disadvantages ◽  
Variable Friction

The implementation of variable friction dampers (VFD) for vibration mitigation of seismic structures generally requires an efficient semi-active control law. In this paper, a semi-active modal control method is proposed to determine the controllable clamping force of a variable friction damper. A comparative study was performed on a multiple DOF structure controlled by passive friction dampers, variable friction dampers in subsection numerical examples. Finally, this paper also provides preliminary conclusions about the advantages and disadvantages for friction dissipators.

Application of the Ritz Averaging Method in the Analysis of the Seismic Performance of Piping Systems

1987 ◽  
Vol 109 (3) ◽  
pp. 315-322 ◽  
Author(s):  
M. A. Pickett ◽  
D. J. Cunningham ◽  
S. K. Sinha ◽  
J. Madia
Keyword(s):  
Seismic Performance ◽  
Averaging Method ◽  
Seismic Excitation ◽  
Piping System ◽  
Nonlinear Characteristics ◽  
Normal Limits ◽  
Equivalent Linear ◽  
Piping Systems

The Ritz averaging method is utilized to reduce the nonlinear characteristics of piping system supports (snubbers) to equivalent linear support stiffnesses during seismic excitation. The equivalent snubber support stiffnesses are used in seismic modal analyses of two piping systems. The analyses are performed in order to determine the effect that high snubber lockup velocities have on piping system stresses. The results show that the lockup velocity of snubbers in the systems analyzed can be safely allowed to increase above normal limits without any significant increase in nodal stresses.

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