Abstract
ABSTRACT In steel structures, the greater energy dissipation capacity of a beam-column connection means greater seismic performance. Increasing energy dissipation of the slip of cantilever beam splices is an effective method of improving the energy dissipation capacity of beam-column connections. This paper provides a study of an “upper flange welded-lower flange bolted” (UWLB) beam-column connection with slotted holes. The UWLB connection is a new type of the beam-column connection, whose upper flanges and lower flanges of the splicing area have different splicing methods, the upper flanges welded while the lower flanges bolted. Six finite element models were established to analyze the effects of the different slotted hole dimensions on energy dissipation capacity. The results show that the energy dissipation of the splicing area increases with the increase of slotted hole dimensions, and the connections have greater rotational capacity. The energy dissipation ratio of the splicing area is more than 37.7%, the ratio increases with the increase of the slotted holes dimensions. The UWLB connections with slotted holes achieved 0.06 rad rotation under the cyclic loading. The UWLB connection with slotted holes has greater rotational capacity and higher energy dissipation capacity of the splicing area than the normal UWLB connection.
Highlights
Industrialization is the direction for constructions of residential buildings
Compared with bolted beam-column connections, the hysteretic curves of UWLB beam-column connections with slotted holes are fuller than the bolted beam-column connections
It is easy to see that the energy dissipation ratio of the splicing area of the UWLB connections with slotted holes is more than 37.7%, which indicate that the connections with slotted holes have greater energy dissipation capacity and the connections can effectively dissipate energy by the slip and the deformation of the lower flange splice plate
Summary
Industrialization is the direction for constructions of residential buildings. With the development of the industrialization, steel structures have been widely used in the residential buildings as good kind of prefabricated structures. It was found that the rigid beam-column connections of steel structures have poor deformation capacity, poor ductility and poor seismic performance, so that the connections are prone to suffering brittle damage during earthquakes, causing economic losses and safety threats. For this problem, researchers have analyzed the seismic performance of the beam-column connection and proposed improvement measures. LIU et al carried out cyclic loading tests and finite element analyses on Z-type cantilever beam splices of column-tree connections This connection is the fabricated connection and it can move the plastic hinge away from the beam end. Six finite element models were established by the finite element analysis software ABAQUS in order that the effects of different slotted hole dimensions on the energy dissipation capacity could be analyzed
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