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Smart Structures and Systems
  Volume 23, Number 4, April 2019 , pages 329-335

Effect of flexural and shear stresses simultaneously for optimized design of butterfly-shaped dampers: Computational study
Alireza Farzampour, Matthew R. Eatherton, Iman Mansouri and Jong Wan Hu

    Structural fuses are made up from oriented steel plates to be used to resist seismic force with shear loading resistance capabilities. The damage and excessive inelastic deformations are concentrated in structural fuses to avoid any issues for the rest of the surrounding elements. Recently developed fuse plates are designed with engineered cutouts leaving flexural or shear links with controlled yielding features. A promising type of link is proposed to align better bending strength along the length of the link with the demand moment diagram is a butterfly-shaped link. Previously, the design methodologies are purely based on the flexural stresses, or shear stresses only, which overestimate the dampers capability for resisting against the applied loadings. This study is specifically focused on the optimized design methodologies for commonly used butterfly-shaped dampers. Numerous studies have shown that the stresses are not uniformly distributed along the length of the dampers; hence, the design methodology and the effective implementation of the steel need revisions and improvements. In this study, the effect of shear and flexural stresses on the behavior of butterfly-shaped links are computationally investigated. The mathematical models based on von-Mises yielding criteria are initially developed and the optimized design methodology is proposed based on the yielding criterion. The optimized design is refined and investigated with the aid of computational investigations in the next step. The proposed design methodology meets the needs of optimized design concepts for butterfly-shaped dampers considering the uniform stress distribution and efficient use of steel.
Key Words
    structural fuses; shear and flexural stresses; butterfly-shaped damper; von-Mises criteria; uniform stress state function; optimization
Alireza Farzampour and Matthew R. Eatherton: Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, United States
Iman Mansouri: Department of Civil Engineering, Birjand University of Technology, Birjand, Iran
Jong Wan Hu: Department of Civil and Environmental Engineering, Incheon National University, Incheon 22012, South Korea;
Incheon Disaster Prevention Research Center, Incheon National University, Incheon 22012, South Korea

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