| Several types of rigid beam-column connections used in high seismic region will be recommended by presently revised "Technical specification for steel structure of tall buildings" (JGJ99), one of which is beam-through type box-column connected to H-shaped beam with side-plate reinforced beam flanges. The aim of experiment in this paper is to provide the reference dara for revising the Specification.The details and design formula of side plates were provided based on the suggestion of "Recommendation for Design of Connections in Steel Structures" published in November 2001 in Japan. Then the design procedure and practical design formula were given in terms of relative Chinese codes. On the basis of above suggestions, 4 one-half scale T-shape specimens were designed, among which the influences of ratios of width-to-thickness and height-to-thickness of beam flanges were considered, together with different reinforced types. After that, experiment was carried out with cyclic loading, the phenomena of test were described, and the test results were analyzed.The test results revealed that the connections of this type had a good performance on the strength and rigidity, but not very well on plastic deformation, except SMF-4 was fractured quickly after maximum bearing capacity reached due to poor quality of butt welds, the plastic rotation of the other three specimens was justly reached or approached the demand of Special Moment Frame by AISC seismic specification. This was due to the heat effect of welding to connect the side plates and the beam flanges, which caused brittle tear of beam flanges in the heat effect zone outside of reinforced part. To satisfied the demand of plastic deformation, this defect must be overcame if this type of reinforced connection if it was used in the zone of high seismic fortification intensity.At the end of the paper, suggestions on design and construction were proposed accordingthe test results, which might direct the revising of specification and practical design. |
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