Achieving a more effective concentric braced frame by the double-stage yield BRB

2019 ◽  
Vol 186 ◽  
pp. 484-497 ◽  
Author(s):  
F. Barbagallo ◽  
M. Bosco ◽  
E.M. Marino ◽  
P.P. Rossi
Keyword(s):  
Braced Frame ◽  
Stage Yield

Seismic evaluation of single-storey steel buildings

1999 ◽  
Vol 26 (4) ◽  
pp. 379-394 ◽  
Author(s):  
M S Medhekar ◽  
DJL Kennedy
Keyword(s):  
Seismic Performance ◽  
Response Spectrum ◽  
Time History ◽  
Analytical Models ◽  
Steel Buildings ◽  
Concentrically Braced Frames ◽  
Braced Frame ◽  
Seismic Zones ◽  
Concentrically Braced Frame ◽  
Concentrically Braced

The seismic performance of single-storey steel buildings, with concentrically braced frames and a roof diaphragm that acts structurally, is evaluated. The buildings are designed in accordance with the National Building Code of Canada 1995 and CSA Standard S16.1-94 for five seismic zones in western Canada with seismicities ranging from low to high. Only frames designed with a force modification factor of 1.5 are considered. Analytical models of the building are developed, which consider the nonlinear seismic behaviour of the concentrically braced frame, the strength and stiffness contributions of the cladding, and the flexibility, strength, and distributed mass of the roof diaphragm. The seismic response of the models is assessed by means of a linear static analysis, a response spectrum analysis, a nonlinear static or "pushover" analysis, and nonlinear dynamic time history analyses. The results indicate that current design procedures provide a reasonable estimate of the drift and brace ductility demand, but do not ensure that yielding is restricted to the braces. Moreover, in moderate and high seismic zones, the roof diaphragm responds inelastically and brace connections are overloaded. Recommendations are made to improve the seismic performance of such buildings.Key words: analyses, concentrically braced frame, dynamic, earthquake, flexible diaphragm, low-rise, nonlinear, seismic design, steel.

Hybrid braced frame with buckling-restrained and strong braces to mitigate soft story

2021 ◽  
Vol 181 ◽  
pp. 106610
Author(s):  
Niloufar Mashhadiali ◽  
Siamak Saadati ◽  
Seyed Amir Mohammad Mohajerani ◽  
Parviz Ebadi
Keyword(s):  
Braced Frame ◽  
Soft Story
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