New Analytical Model for Viscous Wall Damper Based on Refined Material Testing and Analysis


Abstract eng:
Viscous damper is one of the most widely used velocity-dependent dampers in Japan. It can reduce building responses of wide range of magnitude, such as micro-vibration caused by traffic, moderate and relatively long vibration caused by wind, and intense vibration caused by a major earthquake. The typical viscous damper in Japan is the viscous wall damper (VWD) which has been produced for more than twenty years. It is like the stud installed between the upper and lower beams, and generates damping force by the shearing force of the viscous fluid. Buildings with VWDs showed well-reduced vibration, as evidenced by their responses recorded during the 2011 Tohoku Earthquake. The data for dynamic properties and analytical model of the VWD were produced many years ago according to the thencurrent requirements. In order to promote optimal use of the VWD, more detailed property data and more accurate analytical model are necessary. This paper, therefore, explains the writers’ recent study involving comprehensive test program of the viscous material and new analytical modeling with significantly enhanced accuracy. They are summarized below: The past data for the viscous fluid seemed to contain effects of boundary condition of the test apparatus. After many trial and error, the writers have developed the new test method and apparatus that can extract the ideal data of the viscous fluid by creating simple shearing flow condition. Using thus-obtained data, the analytical model and the approximate model for the viscous fluid are developed. The model appears to be accurate over wide range of material strain up to 2,000%, temperature 0 to 40 degree(C), loading frequency 0.1 to 2.5 Hz. Since the viscous fluid data and corresponding analytical model mentioned above do not contain specific boundary effect, they can readily be used for analytical model of any damper utilizing shearing flow resistance. Accordingly, a new VWD model is formulated by using the viscous fluid model and the flexibility of the fluid container. The VWD model also appears to be accurate, and its response reduction effectiveness will be demonstrated through analysis of the building under small to catastrophic excitations.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 4830.:
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