Tests and FE analysis for impact behavior of RBS beam-column connections of steel frames

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (11) : 107-114.

WANG Haitao1, ZHANG Suqing1, HUO Jingsi1,2

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Abstract

Two reduced beam section (RBS) welded beam-column connection specimens of steel frames with FEMA standard over-welded hole structure were designed. Impact tests using drop-hammer were conducted to simulate structure’s collapse behavior under impact loading to observe effects of RBS beam-column connection on impact resistance performance of steel frame beam-column connections. The connection specimens’ failure modes and time histories of impact load and deformation were obtained. The dynamic response laws of specimens, connections’ dynamic rotary angle and energy dissipation capacity were analyzed. Test results showed that the failure modes of RBS welded beam-column connection specimens mainly are out-of-plane deformation and web distortional one due to upper flange yield of steel beam plastic hinge section; two specimens have a good rotary capacity to resist impact loading, while their maximum rotary angles far exceed the FEMA350 design limit (=0.077rad); their energy dissipation capacity and ductility are superior to those of the ordinary welded connections. The FE model for RBS welded beam-column connection structure was established using the software ABAQUS. The internal force varying law of specimens during impact loading was analyzed. It was shown that RBS welded beam-column connection design is helpful for the transfer of structural deformation to the catenary effect.

Key words

steel frame beam-column connection / reduced beam section (RBS) / dynamic behavior / ductility / finite element (FE) / internal force analysis

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WANG Haitao1, ZHANG Suqing1, HUO Jingsi1,2 . Tests and FE analysis for impact behavior of RBS beam-column connections of steel frames[J]. Journal of Vibration and Shock, 2018, 37(11): 107-114

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