Abstract
This paper proposes a new type of spliced joint, named flange bolted-welded hybrid joint, which is designed to splice I-shape beam to facilitate the construction of industrialized buildings. The flange, welded with the bottom beam flange as well as the web close to bottom flange, are jointed by high strength bolts. Stiffening plate is welded at top of the flange while downhand welding and high strength friction grip bolts are used for the top beam flange and the beam web, respectively. The connection reduces the construction period and costs. In this paper, monotonic and reversed cyclic loading tests were conducted on three full-scale specimens of this innovative joint to investigate its load-bearing capacity, energy-dissipating capacity and failure modes. The results indicate that the joint has high load-bearing capacity and great ductility. The failure mode is due to the slippage of flange bolts as well as the gap development between the two flange plates. The experimental studies enabled improvement of the design of the connection to be used in moment-resisting steel frame structures.
Highlights
Beam-to-beam and beam-to-column connections have been found to have a great influence on structural behavior
A reduced beam section is proposed to create a weak point in the beam element, which modifies the ductility of the connection but may be vulnerable to stress concentration at the beam web and decreases moment capacity significantly [2,3,4,5]
The observed failure modes of ultimate load are illustrated in Fig. (7a)
Summary
Beam-to-beam and beam-to-column connections have been found to have a great influence on structural behavior. A new type of connection, named flange bolted-welded connection, is designed in aiming at accelerating construction speed, improving joint behavior and satisfying construction of industrialized buildings. The beam splice types have field-bolted connection and web-bolted flange-welded connection. Brittle fracture was observed in the shop welding connections Based on these defects, the proposed joint, named flange bolted-welded joint, aims to enhance the seismic behavior as well as convenient installation. The flange bolted-welded splice connection, as an improvement on column-tree connection, didn't fail owing to welding fracture because of its reasonable force transfer mechanism. These bolts were tightened to 125kN and 355kN pretention force respectively following the specification GB50017 [17]
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