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Experimental investigation of composite joints with concrete-filled steel tubular column under column removal scenario
Highlights CFST composite joints were experimentally investigated under column removal scenario. RC slab restrained local buckling of stiffening ring plate and top flange of steel beam. RC slabs improved the resistance of composite joints by arch mechanism. Lower flange of steel beam fractured at both sides at the end of loading. Premature failure of lower flange of steel beam weakened the catenary mechanism.
Abstract This paper conducted an experimental investigation on the performance of composite joints with concrete filled steel tubular (CFST) column under column removal scenario. Four specimens with or without reinforced concrete (RC) slab were prepared. The failure mode, vertical resistance and section strain of the joints were analyzed in terms of deformation process, load-displacement curves and strain-displacement curves of the specimens. Finally, the axial force, arch mechanism, interaction between RC slab and steel beam, and vertical resistance distribution of the specimens are discussed. The experimental results show that the lower flanges of steel beams of both the composite joints with or without RC slab fractured at both sides successively at the later loading stage. The local buckling occurred at the top outside stiffening ring plate of the composite joint without RC slab at the early loading stage. For the composite joints with RC slab, longitudinal cracks along the beam span were observed in the slabs. The concrete close to the joint area at mid-span was crushed. Moreover, the resistance mechanism of the composite joint with and without RC slab under column removal scenario can be divided into the flexural mechanism stage, mixed mechanism stage, catenary mechanism stage and failure stage. The RC slab contributes to the development of arch mechanism that improves the resistance of joints. In addition, the premature failures of steel beam flange and the interaction between RC slab and steel beam would weaken the catenary meschanism.
Experimental investigation of composite joints with concrete-filled steel tubular column under column removal scenario
Highlights CFST composite joints were experimentally investigated under column removal scenario. RC slab restrained local buckling of stiffening ring plate and top flange of steel beam. RC slabs improved the resistance of composite joints by arch mechanism. Lower flange of steel beam fractured at both sides at the end of loading. Premature failure of lower flange of steel beam weakened the catenary mechanism.
Abstract This paper conducted an experimental investigation on the performance of composite joints with concrete filled steel tubular (CFST) column under column removal scenario. Four specimens with or without reinforced concrete (RC) slab were prepared. The failure mode, vertical resistance and section strain of the joints were analyzed in terms of deformation process, load-displacement curves and strain-displacement curves of the specimens. Finally, the axial force, arch mechanism, interaction between RC slab and steel beam, and vertical resistance distribution of the specimens are discussed. The experimental results show that the lower flanges of steel beams of both the composite joints with or without RC slab fractured at both sides successively at the later loading stage. The local buckling occurred at the top outside stiffening ring plate of the composite joint without RC slab at the early loading stage. For the composite joints with RC slab, longitudinal cracks along the beam span were observed in the slabs. The concrete close to the joint area at mid-span was crushed. Moreover, the resistance mechanism of the composite joint with and without RC slab under column removal scenario can be divided into the flexural mechanism stage, mixed mechanism stage, catenary mechanism stage and failure stage. The RC slab contributes to the development of arch mechanism that improves the resistance of joints. In addition, the premature failures of steel beam flange and the interaction between RC slab and steel beam would weaken the catenary meschanism.
Experimental investigation of composite joints with concrete-filled steel tubular column under column removal scenario
Wang, Wen-Da (author) / Zheng, Long (author) / Li, Hua-Wei (author)
Engineering Structures ; 219
2020-06-08
Article (Journal)
Electronic Resource
English
| British Library Conference Proceedings | 2008