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    Blind bolted moment connections to concrete-filled circular hollow section (CFCHS) columns for high seismic regions
    Oktavianus, Yusak ( 2017)
    When used as columns, Concrete-Filled Circular Hollow Sections (CFCHS) offer excellent strength, stiffness, and ductility in addition to an attractive appearance. There is also a construction advantage achieved by the elimination of formwork when compared with the construction of RC columns. In light of the brittle failure of welded beam to column connections experienced in the Northridge and Kobe earthquakes and the inapplicability of ordinary structural bolts when connecting beams to closed column sections, a new blind bolt which can be fixed from the outside of the CHS has been developed. This research employs ONESIDE blind bolts produced by AJAX Fasteners which have been modified to take the advantage of the concrete infill; in particular, single headed anchored blind bolts (HABBs) and double headed anchored blind bolts (DHABBs). However, although there has been considerable previous research, and there is ongoing research on moment connections to square hollow sections using the HABBs and DHABBs, there are no guidelines and clear understanding of the behaviour of moment connections to circular hollow sections using the HABBs and DHABBs. Therefore, this research initially involves both experimental and finite element work on the tensile behaviour of HABBs and DHABBs embedded in CFCHS columns, i.e. single and group behaviour. The possibility of deterioration in the behaviour when cyclic loading is applied is also investigated. Developing a semi-rigid or rigid partial-strength connection suitable for use in moment-resisting frames in regions of high seismicity is the main objective of this part of the research, with a focus on achieving sufficient strength and stiffness of the blind-bolted connection to the column. The strength hierarchy in the connection will be such that the strong and stiff blind bolted connection to the column will be paired with energy dissipating devices between this connection and the beam in a similar manner to the Sliding Hinge Joint developed previously for connections to Universal Column sections in regions of high seismicity. These devices, so-called replaceable buckling restrained fuses (RBRFs), will be automatically activated if an earthquake strikes which is larger than the design based earthquake (DBE) and they will provide sufficient displacement capacity under the maximum considered earthquake (MCE).