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A platform for research: civil engineering, architecture and urbanism
Self-Centering Frictional Damper (SCFD)
Highlights The device is self-centering with a gradual increase in strength as the damper and structural deformations increase. Hysteretic cycles are highly repeatable, maximum errors in force estimation and dissipated energy are less than 3% and 10% respectively. The behavior of the SCFD can be accurately predicted using simple equilibrium equations. Theory and equations were tested successfully using experimental dynamic tests on a 115 kN proof-of-concept damper and a FEM of the device. A damper configuration with higher capacity and stroke was tested using a FEM showing excellent accuracy between theory and numerical model.
Abstract This paper describes the behavior and design of a new self-centering frictional damper. This device is based on conic friction surfaces that lead to a flag-shaped hysteretic behavior. Its self-centering property and different possible configurations make it a very versatile device to be used in seismic applications of high-rise buildings subject to earthquakes. A simple mathematical model is presented first to describe the cyclic behavior of the device. Then, important variables related with the geometry and materials used in the device are analyzed to better understand their influence on the hysteretic behavior of the damper and optimize its design. Different friction materials, rubber samples, and coil springs are tested in the laboratory for the design of a proof-of-concept prototype. To test the theoretical model, the 115 kN large-scale damper was manufactured and dynamically tested in the laboratory obtaining excellent agreement between the theoretical and experimental results. Finally, a detailed finite element model was generated to study the local stress concentrations of the different components of the device as well as compare the hysteretic behavior for different possible configurations using metallic and rubber springs.
Self-Centering Frictional Damper (SCFD)
Highlights The device is self-centering with a gradual increase in strength as the damper and structural deformations increase. Hysteretic cycles are highly repeatable, maximum errors in force estimation and dissipated energy are less than 3% and 10% respectively. The behavior of the SCFD can be accurately predicted using simple equilibrium equations. Theory and equations were tested successfully using experimental dynamic tests on a 115 kN proof-of-concept damper and a FEM of the device. A damper configuration with higher capacity and stroke was tested using a FEM showing excellent accuracy between theory and numerical model.
Abstract This paper describes the behavior and design of a new self-centering frictional damper. This device is based on conic friction surfaces that lead to a flag-shaped hysteretic behavior. Its self-centering property and different possible configurations make it a very versatile device to be used in seismic applications of high-rise buildings subject to earthquakes. A simple mathematical model is presented first to describe the cyclic behavior of the device. Then, important variables related with the geometry and materials used in the device are analyzed to better understand their influence on the hysteretic behavior of the damper and optimize its design. Different friction materials, rubber samples, and coil springs are tested in the laboratory for the design of a proof-of-concept prototype. To test the theoretical model, the 115 kN large-scale damper was manufactured and dynamically tested in the laboratory obtaining excellent agreement between the theoretical and experimental results. Finally, a detailed finite element model was generated to study the local stress concentrations of the different components of the device as well as compare the hysteretic behavior for different possible configurations using metallic and rubber springs.
Self-Centering Frictional Damper (SCFD)
Westenenk, B. (author) / Edwards, J.J. (author) / de la Llera, J.C. (author) / Jünemann, R. (author)
Engineering Structures ; 197
2019-07-19
Article (Journal)
Electronic Resource
English