Loading...

Investigation on the seismic behavior of steel MRF with shape memory alloy equipped connections

Rofooei, F. R ; Sharif University of Technology | 2011

1472 Viewed
  1. Type of Document: Article
  2. DOI: 10.1016/j.proeng.2011.07.420
  3. Publisher: 2011
  4. Abstract:
  5. Shape Memory Alloys (SMA) are among the new passive control devices that have gained a large attention due to its inherent features, i.e., recovering the induced residual strains upon unloading (superelastic effect) or by heating (shape memory effect). In this work, the seismic behavior of a set of steel structural models with different number of stories and eccentricities equipped with a type of fixed SMA connections is investigated. Considering an existing SMA connection model in austenite phase, the related moment-rotation behavior is verified through numerical simulation. Then, extensive nonlinear dynamic analyses are performed using a number of 3, 6, 9, and 12 story structural models with 0, 5%, 10%, and 15% eccentricities subjected to different bi-directional earthquake components. The PGA of the earthquake records is scaled to 0.4g and 0.6g to examine the energy dissipation capability of the SMA materials. Similar analyses performed using the same set of structural models, but with all beam-to-column connections equipped with SMA connections. The obtained results indicate that while the reduction in drifts of the SMA equipped models with respect to the fixed connection models was not noticeable, their base shears were considerably reduced. The OpenSees program is used for modeling of the connections with SMA materials and performing the numerical analyses
  6. Keywords:
  7. Shape memory alloy (SMA) ; Austenite phase ; Base shear ; Beam-to-column connections ; Bi-directional ; Connection model ; Earthquake records ; Energy dissipation capability ; Moment-rotation ; Non-linear dynamic analysis ; Passive control devices ; Passive control system ; Residual strains ; Seismic behavior ; Shape memory alloy ; Similar analysis ; Steel moment resisting frame ; Steel MRF ; Structural models ; Superelastic effects ; Superelasticity ; Alloys ; Cerium alloys ; Computer simulation ; Dynamic response ; Earthquakes ; Energy dissipation ; Martensitic transformations ; Model structures ; Numerical analysis ; Seismic response ; Shape memory effect ; Spot welding ; Structural design ; Structural frames ; Unloading ; Mathematical models
  8. Source: Procedia Engineering ; Volume 14 , 2011 , Pages 3325-3330 ; 18777058 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S1877705811014974