Analysis of seismic performance of high strength steel composite K-eccentrically braced frames

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (12) : 95-102.

TIAN Xiaohong1，SU Mingzhou2，LI Shen3，SONG Dan4

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Abstract

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.

Key words

high-strength steel

/ eccentrically brace / IDA / seismic performance / storey drift angel.

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TIAN Xiaohong1，SU Mingzhou2，LI Shen3，SONG Dan4. Analysis of seismic performance of high strength steel composite K-eccentrically braced frames[J]. Journal of Vibration and Shock, 2020, 39(12): 95-102

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