Seismic of Older Concentrically Braced Frames. Charles Roeder (PI) Dawn Lehman, Jeffery Berman (co-PI) Stephen Mahin (co-PI [email protected] ) Po- C hien Hsiao (GSR) University of Washington. Seismic Vulnerability of CBFs.
UW : Single-Story SCBF
Straight line (2t) Elliptical (8t)
Elliptical clearance allows a more compact plate
1. Hinging at Center
Well-Discretized Fiber Cross Section
Minimum of 10 Elements along Brace Length
Spring-type of Shear Tab
Proposed model of gusset plate connections
(Ke and Dlimit were calibrated by NCBF32.)Model Implementation: NCBF
Proposed spring-type model of gusset plate connections combined with axial fracture model of brace-to-gusset connections.
Axial Fracture Model of Connection Calibrated by NCBF32
Impact of building height as or more significant than R
Collapse Level Ground Motions
MCE Ground Motions
Spectral Acceleration (g)