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Impact of Brace Fracture on Column Splice Demands in Braced Frames
| 题名： | Impact of Brace Fracture on Column Splice Demands in Braced Frames |
| 正文语种： | 英文 |
| 作者： | Mahmoud Faytarouni, S.M.ASCE; Onur Seker; Bulent Akbas; Jay Shen |
| 作者单位： | Iowa State Univ;Gebze Technical Univ |
| 关键词： | Modeling brace fracture; Postbuckling seismic performance; Special concentrically braced frames; Column splices; Non linear dynamic analysis; Seismic demands |
| 摘要： | Braces made of square hollow structural sections (HSSs) in special concentrically braced frames (SCBFs) are likely to fracture under expected demand levels. This study, therefore, examines the additional seismic demands on column splices induced due to brace fracture. First, the study introduces the brace fracture models that were utilized for predicting fractures of square HSSs. Second, the selected 5-story and 13-story SCBFs with two different splice locations permitted in the seismic design practice were assessed under an ensemble of ground excitations by introducing different fracture prediction models. Third, the splice demands in terms of axial force, bending moment, and their combined effects were discussed with and without considering brace fracture. The study finds that brace fracture has a negligible impact on tensile force demands on column splices. In return, flexural demands, and the combined tensile force and flexural demands, are shown to be strongly influenced by brace fracture. It is also shown that the splices in SCBFs are vulnerable to undergo inelastic deformations when a brace fracture occurs, which is against the intended design objective. |
| 出版日期： | 2020 |
| 出版年： | 2020 |
| 期刊名称： | Journal of Structural Engineering |
| 卷： | Vol.146 |
| 期： | No.08 |
| 页码： | 04020152 |
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