Seismic performance of fully-assembled embedded steel column base with different constructions.

In order to solve the problems of complex construction process and long construction period in traditional embedded steel column base, this paper proposes a fully- assembled embedded steel column base joint. Two different constructions forms of specimens, high-strength bolt connection and anchor bolt connection, were designed and subjected to horizontal low cycle reciprocating loading tests to study the impact of different connection structures on their seismic performance.The numerical simulations of the tset was also carried out by using the software ABAQUS. The result shows that both connection structures of the specimens have safe and reliable connection capabilities and good seismic performance. The hysteresis curves and skeleton curves of the two connection forms basically overlap. Under large interlayer displace angles, the use of high-strength bolt connection joint has effectively delayed the stiffness degradation of the column base joint；Compared to the anchor bolt connection, its maximum ultimate bearing capacity has increased by 6.55%. At the same time, high-strength bolt connections can avoid the welding of the anchor bolt gaskets and the flange plate, to achieve green construction. In addition, the anchoring performance of anchor bolt connection is superior to high-strength bolt connection, which is suitable for cases where a small amount of welding is permitted on site. Therefore, two types of joints can be flexibly selected according to the engineering requirements in the actual design. • This paper innovatively proposes a fully-assembled embedded steel column base joint, which can achieve efficient assembly. • This study proposes two different constructive forms for this joints, both of which have good seismic performance. • Using high-strength bolts for connection has better ductility and allows for green construction. • The anchoring performance of anchor bolt connection is superior to high-strength bolt connection. [ABSTRACT FROM AUTHOR]