scholarly journals Comparative study of four passive energy dissipation systems

1992 ◽  
Vol 25 (3) ◽  
pp. 175-192 ◽  
Author(s):  
Ian D. Aiken ◽  
Douglas K. Nims ◽  
James M. Kelly
Keyword(s):  
Energy Dissipation ◽  
Earthquake Engineering ◽  
Experimental Studies ◽  
Seismic Retrofitting ◽  
Friction Damper ◽  
Engineering Research ◽  
Passive Energy Dissipation ◽  
New Construction ◽  
Energy Dissipators ◽  
Energy Dissipation Devices

Passive energy dissipation devices have the potential to increase the seismic resistance of a structure by increasing its capability to dissipate energy and by reducing the seismic demand on the structure. They offer particular promise for seismic retrofitting as well as extensive applications in new construction. This paper describes and compares earthquake simulator tests of four new types of passive energy dissipators that were performed at the Earthquake Engineering Research Center of the University of California at Berkeley. The four types of energy dissipator are a Coulomb friction damper; a self-centering friction device in which the slip load is proportional to the slip displacement; a viscoelastic shear damper; and a shape memory alloy. Two different model structures were used in the experimental studies, and the energy dissipators were incorporated as part of the bracing systems of the structures.

scholarly journals Testing of Passive Energy Dissipation Systems

1993 ◽  
Vol 9 (3) ◽  
pp. 335-370 ◽  
Author(s):  
Ian D. Aiken ◽  
Douglas K. Nims ◽  
Andrew S. Whittaker ◽  
James M. Kelly
Keyword(s):  
Energy Dissipation ◽  
Earthquake Engineering ◽  
Structural Response ◽  
Phase Changes ◽  
Acrylic Copolymer ◽  
Friction Resistance ◽  
Engineering Research ◽  
Passive Energy Dissipation ◽  
Energy Dissipators ◽  
Shake Table Experiments

Over the period 1986 to 1991, seven different passive energy dissipation systems were studied in experimental research programs at the Earthquake Engineering Research Center of the University of California at Berkeley. This paper presents an overview of these studies, describing the different types of devices, the results of the shake table experiments, and associated analytical work. Four of the systems studied are friction systems, and of these, three (Sumitomo, Pall, and Friction-Slip) are based on Coulomb friction. The fourth is the Fluor-Daniel Energy Dissipating Restraint, which is a device capable of providing self-centering friction resistance that is proportional to displacement. The three other systems all have different energy dissipation mechanisms: ADAS elements, which utilize the yielding of mild-steel X-plates; viscoelastic shear dampers using a 3M acrylic copolymer as the dissipative element; and Nickel-Titanium alloy shape-memory devices that take advantage of reversible, stress-induced phase changes in the alloy to dissipate energy. The effectiveness of the various systems is evaluated by comparing the response of the test structures without and with the energy dissipators. In some cases, where devices were studied using the same test structure, they are compared directly. All of the systems investigated exhibited characteristics beneficial to improved structural response to earthquake loading.

Viscous Dampers Utilized at an Operating Electronic Facility for Reducing Seismic Risk

2014 ◽  
Vol 1021 ◽  
pp. 128-139
Author(s):  
Heng Sheng Chang ◽  
Ji Ping Ge
Keyword(s):  
Energy Dissipation ◽  
Seismic Activity ◽  
Seismic Risk ◽  
Semiconductor Manufacturing ◽  
Damping Ratio ◽  
Viscous Damper ◽  
Fundamental Vibration ◽  
Passive Energy Dissipation ◽  
Energy Dissipation Devices

Using supplemental energy dissipation devices into the structure to increase the damping ratio for reducing the responses of seismic activity has become more and more popular. This paper presents a case study of seismic retrofit strategy, utilizing a type of passive energy dissipation device, namely, the viscous damper, in order to make an ongoing chips produced facility resistant to seismic activity. The building in question was a chips produced facility belonging to a semiconductor manufacturing company. This was a double FAB where the structure system was divided into an island building and an RC shell. The retrofit involved installing 44 non-linear dampers between the island building and the RC shell. This was due to the significant differences in the fundamental vibration periods. This paper will present the rationale of making a decision on the parameters of the dampers to give the optimum retrofit strategy.

Simplified Method for Pushover Curves of Asymmetric Structure with Displacement-Dependent Passive Energy Dissipation Devices

2007 ◽  
Vol 10 (5) ◽  
pp. 537-549 ◽  
Author(s):  
Hong-Nan Li ◽  
Gang Li
Keyword(s):  
Energy Dissipation ◽  
Analytical Method ◽  
Numerical Results ◽  
Asymmetric Structure ◽  
Engineering Analysis ◽  
Passive Energy Dissipation ◽  
Symmetric Structure ◽  
Simplified Method ◽  
Pushover Curve ◽  
Energy Dissipation Devices

This paper presents a simplified method to calculate pushover curves for an asymmetric structure with displacement-dependent passive energy dissipation devices (DDPEDDs). The deformations of a symmetric structure are analyzed in translation and torsion, respectively. These results are then combined in order to calculate the pushover curve for an asymmetric structure with DDPEDDs. The numerical results obtained by using the simplified analytical method are then compared to those obtained from the analysis of the models using the software SAP2000. The results show that the simplified analytical method can be an effective tool for engineering analysis of an asymmetric structure.

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