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- W2789949235 abstract "Concrete-filled tubular (CFT) columns have been commonly used as part of specialmoment-resisting frames in high-rise buildings for decades. Blind-bolts mechanicalsystems are widely adopted for on-site bolting of open beam to tubular columnconnections. The common types of blind bolts are Hollo-Bolt (HB) and its modifiedversion, Extended Hollo Bolt (EHB). However, EHB bolts could not provide sufficientmoment-resistance capacity and exhibited several shortcomings such as bolt slippage,low load transfer mechanism, bolt elongation and column face bending. A new blind boltcalled Double sleeve-TubeBolt was proposed in this research to solve the abovementioned problems. The first part of this research was experimental pull-out tests ofindividual bolt under monotonic loading to obtain the performance of the TubeBolt andEHB bolt. The force-displacement, anchorage and elongation behavior of the bolts weredetermined. The test specimens were varied according to type of bolts, bolt diameter,concrete confinement and column wall thickness. For the second part of this study, sixhalf scale cruciform specimens, connecting an open beam to CFT column with the novelblind bolt connection were tested under cyclic loading to investigate the seismicperformance of the connections. The effects of different parameters on the behavior ofthe connection, such as bolt type, bolt grade and stiffeners at the top and bottom of theendplate were investigated. The failure modes, hysteretic performance, rotation capacity,strength and stiffness degradation, ductility and energy dissipation of the connectionswere analyzed. The pull-out test results indicate that the tensile capacity of the TubeBoltis 2.5 times higher than the existing EHB bolt. In addition, the Tubebolt has better anchorage and the elongation has reduced to 68% compared to the existing EHB bolt.The cyclic test results of the cruciform specimens demonstrate that the new blind boltedconnections exhibit a large hysteretic enclosed area, good ductility, and excellent energydissipation compared to the EHB connection. The TubeBolt has achieved betterperformance compared to the EHB bolt, with 36% and 24% increase in the maximumstrength and initial stiffness, respectively. No column face deformation and concretedamage is observed in the test. The results prove that the proposed TubeBolt connectionsatisfies the seismic provisions and ductility design requirements to be utilized inmoment-resisting frames in seismic zones." @default.
- W2789949235 created "2018-03-29" @default.
- W2789949235 creator A5002137398 @default.
- W2789949235 date "2017-12-01" @default.
- W2789949235 modified "2023-09-26" @default.
- W2789949235 title "Experimental investigations on novel double-sleeve tubebolt moment connection to concrete filled tubular column / Mahdi Zeinizadeh Jeddi" @default.
- W2789949235 hasPublicationYear "2017" @default.
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