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Steel and Composite Structures Volume 30, Number 3, February10 2019 , pages 201-215 DOI: https://doi.org/10.12989/scs.2019.30.3.201 |
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Numerical investigation of cyclic performance of frames equipped with tube-in-tube buckling restrained braces |
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Shahrokh Maalek, Hamid Heidary-Torkamani, Moharram Dolatshahi Pirooz and Seyed Taghi Omid Naeeini
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| Abstract | ||
| In this research, the behavior of tube-in-tube BRBs (TiTBRBs) has been investigated. In a typical TiTBRB, the yielding core tube is located inside the outer restraining one to dissipate energy through extensive plastic deformation, while the outer restraining tube remains essentially elastic. With the aid of FE analyses, the monotonic and cyclic behavior of the proposed TiTBRBs have been studied as individual brace elements. Subsequently, a detailed finite element model of a representative single span-single story frame equipped with such a TiTBRB has been constructed and both monotonic and cyclic behavior of the proposed TiTBRBs have been explored under the application of the AISC loading protocol at the braced frame level. With the aid of backbone curves derived from the FE analyses, a simplified frame model has been developed and verified through comparison with the results of the detailed FE model. It has been shown that, the simplified model is capable of predicting closely the cyclic behavior of the TiTBRB frame and hence can be used for design purposes. Considering type of connection detail used in a frame, the TiTBRB member which behave satisfactorily at the brace element level under cyclic loading conditions, may suffer global buckling due to the flexural demand exerted from the frame to the brace member at its ends. The proposed TiTBRB suit tubular members of offshore structures and the application of such TiTBRB in a typical offshore platform has been introduced and studied in a single frame level using detailed FE model. | ||
| Key Words | ||
| tube-in-tube buckling restrained brace; buckling restrained braced frame; offshore platforms; cyclic loading; FE analysis | ||
| Address | ||
| (1) Shahrokh Maalek, Moharram Dolatshahi Pirooz, Seyed Taghi Omid Naeeini: School of Civil Engineering, College of Engineering, University of Tehran, Iran; (2) Hamid Heidary-Torkamani: School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran. | ||