Abstract
A novel shop-welded joint for H-beam to concrete-filled steel tubular column with field-bolted flange splicing used in prefabricated steel structure is proposed. Four full-scale specimens were tested under cyclic loads, and the effects of bolt diameter, beam flange cover plate, widened beam flange at the end, and the flange thickness on the seismic performance of joints were studied by experiments and numerical simulation. The seismic performance of the shop-welded joint is compared to that of traditional welded joints. According to the results, the beam flange thickened by welding cover plate and widened by welding plate at the beam end can improve the yield resistance, ultimate resistance, stiffness, ductility, and energy dissipation capacity of the joint, while the bolt diameter and the flange thickness did not make significant influences. The shop-welded joints could be regarded as rigid. Adding cover plate, widening beam flange, or increasing column base flange thickness can effectively reduce the beam end stress and avoid brittle failure of welds under rare earthquakes. Simplified formulas for the yield and ultimate loads of the shop-welded joint were proposed.
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