Seismic Performance Analysis of High-Strength Steel Frames with Y-Shaped Eccentrically Braces
In the high-strength steel frame with Y-shaped eccentrically braces,the energy-consuming beam,which called links,are arranged vertically,and the frame beams are two independent members,so the cross-sectional design is more flexible,and the plastic deformation has less impact on the frame beams and floor slabs,which is easy to repair after the earthquake.The energy-consuming beam sections were de-signed as ordinary steel with a yield point below 345 MPa to ensure good ductility and energy consumption of the overall structure,while the non-energy-consuming members such as frame beams and columns were designed as high-strength steels,such as Q460 or Q690,to reduce the cross-sectional size of the members ensuring the elastic stress state of the non-energy-consuming members.The length of the links and the num-ber of storeys(height of the structure)were the main factors affecting the performance of the structure.Three sets of prototype structures of high-strength steel frames with Y-shaped eccentric braces with 8,12 and 16 storeys were designed by the performance-based design method,with each set of link length varying from 700 mm,900 mm and 1 100 mm,for a total of nine models.The effects of the length of the links and the number of storeys on the failure mode,stiffness,distribution of storey drift and link rotation were inves-tigated by Pushover analysis and dynamic elastoplastic analysis.The results showed that the longer the links,the weaker the lateral stiffness of the structures;the storey drift and the link rotation showed similar distribution patterns for all structures.
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