Study on static test of planar KK-type rectangular hollow section steel joints
Based on the single-layer reticulated shell steel roof of a theme square crescent gallery,a typical joint with the most unfavorable stress were selected,and two KK-type RHS(rectangular hollow section)steel joints,i.e.,the center plate joint and the hub joint were designed.The two full-scale models were conducted static load and tested.The strain and stress distribution law in the joints area of the models were measured and analyzed,and the deformations at the end of the branch tubes were also measured and comparatively analyzed.The results show that:1)Under the design load level,both joints meet the strength deign requirement;and the maximum test loads of the hub joint and the center plate joint are respectively about 2.85 and 3.25 times of the equivalent design load.The two joints have high safety redundancy.2)Under the action of the maximum test load,the root of both nodal branches exhibited varying degrees of yielding in the vicinity of the coherent weld with the center member.The weld of one stiffener in the cylinder of the hub joint is partially cracked.3)Under the action of the same load,the measured stresses and strains of the center plate joint is relatively lower than those of the hub joint,so the bearing strength of the center plate joint is relatively higher.4)According to the measured load-deformation curve,the average displacement of each tube of the hub joint is about 13.3％larger than that of the central plate joint,which indicates that the central plate joint has higher elastic stiffness.
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