Evaluation of drilled flange connections with combined arrangements of holes and notches
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Evaluation of drilled flange connections with combined arrangements of holes and notches Peyman Shadman Heidari1 · Armin Aziminejad1 · A. S. Moghadam2 · Mohammad Ali Jafari3 Received: 6 February 2020 / Accepted: 30 July 2020 © Springer Nature B.V. 2020
Abstract The reduced beam section (RBS) connections are used to improve the seismic behavior of rigid connections. The brittle failure and lateral-torsional buckling are the drawbacks of these connections. Drilled flange connections (DFC) are one of the novel configurations of RBS connections. This form of the reduction in beam section can reduce the probability of local buckling, however, the tearing of the beam flange between the drilled holes are the drawbacks of these connections. By implementation proper arrangements of holes and notches, more uniform strain distribution may be made in welds and drilled flanges. The experimental studies were conducted on a welded unreinforced flange (WUF) connection and suggested a sample of drilled flange connection with combined circular holes and notches (CDFC). The results of experimental studies were used to validate the analytical models. To evaluate the seismic performance of different arrangements of the flange drilling, various analytical models were prepared and their behavioral indexes were compared. Results of the analytical studies revealed that by applying the proper drilling pattern, the potential brittle failure, and local buckling of the drilled zone of DFC connections would be reduced. Among the studied arrangements (i.e., WUF, RBS, DFCs with inclined, parallel and combined notches and holes drilling patterns), CDFC with combined notches and holes drilling patterns performed better than the other connections, and Remarkable reductions of damage indexes were observed in connection. By implementing this pattern, the equivalent plastic strain would be reduced up to 71.1% in groove welds comparing to the conventional RBS connections. Keywords Reduced beam section connections · Drilled flange connections · Drilling configuration of the beam flange · Combined circular holes and notches (CDFC) · Inclined drilling configuration · Parallel drilling configuration
* Armin Aziminejad [email protected] Extended author information available on the last page of the article
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Bulletin of Earthquake Engineering
1 Introduction Several moments resisting steel frames suffered damage during the Northridge earthquake of 1994. Many researchers believe that the brittle behavior of welds was the main reason for such damages (Youssef et al. 1995). Following the Northridge, earthquake researches were conducted on connections of moment-resisting steel frames. They studied the locations of failure and fracture modes of the welded connections (Popov et al. 1998). After the Northridge earthquake, a project started among the research institute called the SAC steel projects, focused to recognize and solve the issues and drawbacks of steel momentresisting connections (FEMA-267 1999; Venture 1997). It w
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