Study on static performance of welded hollow spherical and Z-shaped bolted joint with H-beams
A novel welded hollow spherical and Z-shaped bolted joint with H-beams(novel bolted joint)is proposed,which is suitable for the upper reticulated shell connection of fully assembled long-span suspen-dome structure system.The chord of the joint is made of hot-rolled H-beams with easy bolting,rapid assembly,low manufacturing energy consumption,and may realize the the standardization of parts and components to the system.In order to study the static performance of novel bolted joints,finite element analysis of the joints was carried out under axial compression,axial tension,bending moment and compression-bending loading conditions.The failure mode,bearing capacity,stiffness and ductility of the joints under different load conditions were studied.The failure mode and static performance of novel bolted joint and welded hollow spherical welded joint with H-beams(welded joint)were compared.The research shows that the ultimate failure modes of novel bolted joint and welded joint are local buckling and yielding of H-beam chords under axial compression and compression-bending loading conditions.Under axial tensile load,the ultimate failure modes of novel bolted joint and welded joint were full-section yield of H-beam chord.Under bending moment load,the ultimate failure modes of novel bolted joint and welded joint were local buckling of H-beam chords.Novel bolted joint may realize that the plastic hinges far away from the welds and connection region,which meets design requirement of"strong connection and weak member".
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