Analysis of seismic performance of high strength steel composite K-eccentrically braced frames
TIAN Xiaohong1，SU Mingzhou2，LI Shen3，SONG Dan4
1.School of Mechanical and Precision Instrument Engineering, Xi’an University of Technology, Xi’an 710048, China;
2.School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China;
3.School of Civil Engineering and Architecture, Xi’an University of Technology, Xi’an 710048, China;
4.Northwest Engineering Corporation Limited, Xi’an 710065, China
To evaluate the seismic performance of high-strength steel composite eccentrically braced frames (K-HSS-EBFs), a 20-story K-HSS-EBF was designed, and Incremental dynamic analysis (IDA) was carried out with 10 seismic ground motions. The weak parts of the structure, the formation and development of the plastic zones of the link and the relationship between deformation of link and maximum story drift under the action of strong earthquakes were researched. The IDA curves of 10%, 50% and 90% fractiles and the displacement ductility coefficient were ascertained. The seismic performance was assessed by combining it with the defined performance parameters. The results show that with the increase in the peak ground acceleration, the links successively entered the plastic state and absorbed the seismic energy. The collapse fragility curve can reflect the seismic performance of the K-HSS-EBFs. The K-HSS-EBFs designed according to the current code have negligible risk of collapse and high security reserve, which will cause waste.
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