Cyclic behaviour of individual double headed anchored blind bolts within CFST

Abstract

When bolted connections are preferred and concrete-filled steel tubes are chosen as the columns, blind bolts can be used instead of ordinary structural bolts to eliminate the need for access to the inside of the tube to tighten the nut. In order to achieve a stiff and strong connection, a modification of the blind bolt has previously been made by extending the bolt shank into the concrete and inserting another nut at the end of the bolt shank, the so-called headed anchored blind bolt (HABB). A further advance has been instigated here to achieve the maximum possible pull-out stiffness of this type of blind bolted connection by installing an additional head at the middle of the bolt shank anch..