Abstract
Today, architectural application and economic constraints require that vertical-irregular structures be constructed in urban areas. Proposing methods to minimize damage to these structures during earthquakes is therefore crucial. Strict regulations have been enforced for the design and analysis of irregular structures given their higher vulnerability to damage compared to that of regular structures. The present study aimed to evaluate eight regular and irregular 10-story and 15-story steel structures with buckling-restrained braces frames (BRBFs) and concentric braced frames (CBFs) in terms of their responses to twelve far-field earthquakes. According to the obtained results, the mean value of maximum drift, top floor displacement and floor acceleration were higher in both regular and irregular structures with BRBFs than in those with CBFs.
Highlights
Buckling restrained braces (BRBs) are seismic elements that comprise an axially yielding core and an axially decoupled restraining mechanism, which suppress the overall buckling
15-story steel-frame buildings—four regular and four irregular—with conventional braced frames (CBFs) and buckling-restrained braces frames (BRBFs) were chosen to ETABS software
Using BRBs respectively increased the mean drift by 48% and 77% in the four with regular
Summary
Buckling restrained braces (BRBs) are seismic elements that comprise an axially yielding core and an axially decoupled restraining mechanism, which suppress the overall buckling. Numerous seismic resistant members employed to decrease the probability of structural collapse during earthquakes include concrete-filled steel tubes, shear walls, braces and structures confined with high-strength concrete [3,4,5,6,7,8,9]. Given their significantly higher seismic performance compared to that of conventional braced frames (CBFs), buckling-restrained braced frames (BRBFs) are growingly used today as efficient seismic load resistant frames in regions with high seismic hazard levels. In assessment of seismic responses of tall buildings, far-field ground motions should be taken into account
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