SHEAR STRENGTH OF CONVENTIONAL AND PROPOSED BEARING CONNECTION BETWEEN STEEL ROOF AND RC FRAME OF GYMNASIA

Abstract

Numerous damages of steel roof bearing connection of RC gymnasia have been reported at recent major earthquakes. One of major failure modes is concrete break-out failure due to a lack of edge distance between anchor bolts and concrete surface. To increase the shear strength of the connection, it is proposed that an anchor bolt is arranged at the center of the RC element, and stiffened by welding steel plates. A series of static tests has been conducted and results show that the ultimate strength of conventional connections is determined by concrete break-out strength while those of proposed connection is increased.