Comparison of the Seismic behavior of Eccentrically Braced Frames Consisting of Middle and Side Shear Link Beams
In the seismic design of structures, important indicators such as stiffness, ductility, as well as the capability of high energy dissipation, have always been considered by designers. Extensive studies by researchers showed that these frames have the desired characteristics. In this type of bracing,...
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| Main Authors: | , |
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| Format: | Article |
| Language: | fas |
| Published: |
Razi University
2024-06-01
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| Series: | مدلسازی پیشرفته در مهندسی عمران |
| Subjects: | |
| Online Access: | https://amcen.razi.ac.ir/article_3292_99455c5fc21426d46594f4985ec052a1.pdf |
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| Summary: | In the seismic design of structures, important indicators such as stiffness, ductility, as well as the capability of high energy dissipation, have always been considered by designers. Extensive studies by researchers showed that these frames have the desired characteristics. In this type of bracing, the link beam as a fuse keeps the ductility and seismic behavior of the structure. The philosophy of designing systems with eccentric bracing is to limit inelastic deformations only in the connection beam. In Iran, the using of EBFs consisting of middle and side shear link beams is much more common than other eccentrically braced frames. In this research, at first, a laboratory frame sample was verified by ABAQUS finite element software. In the following, the seismic performance of a frame sample consisting of a middle shear link beam was evaluated in comparison with a frame consisting of a side link beam. The results of the research showed that under the cyclic load, the frame equipped with the middle link beam has a better energy dissipation capability compared to the frame equipped with the side link beam. So, the final capacity and lateral elastic stiffness of the frame consisting of the middle link beam was 240% and 300% higher than the frame consisting of the side link beam, respectively. Also, in the frame equipped with side link, the maximum values of Von-Misses stress and equivalent plastic strain were 14% and 131% higher, respectively, than the frame equipped with middle link. On the other hand, in the frame equipped with lateral link, the maximum values of stress and strain were concentrated at the end of the link member and in the vicinity of the column. In other words, the index of occurrence of damage and as a result failure in the frame consisting of the side link is more than the frame consisting of the middle link. Based on the obtained results, it can be said that the frame consisting of the middle link beam has better seismic performance compared to the frame consisting of the side link beam. |
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| ISSN: | 3060-7620 |