| The middle joint of the steel frames constructed by box-column and steel H beam is commonly used in steel frame structures。In order to transfer the bending moment at the end of the beam effectively,the transverse stiffing plates should be provided at the same height position of the column web and the bean flange;However,the stiffing plates would not be provided if the bending moment is small or if the construction mode of the joint does not required。For this kinds of joints,the requirement which should be met by the beam flanges in tension and column flanges in compression and webs have been presented by the current Chinese Steel Structure Design Code , But the specification rigirally comes from the mechanics and analysis of the bean-column joint of H section column ,and can not be used in the design of the box-column because there are intrinsical differences in mechanics modes between the two joints。The purpose of this paper is to analysis the capacity performance of the joints by destructive experiments of the middle joints which connect the box-column and steel H beam of the steel frame and no stiffing plates are provided in the box-column。Two parts research work have been carried out in this paper .①The static destructive experiments of 3 scale size middle joints without stiffing plates of steel frame constructed box-column and steel H beam are completed。In the experiments,the lateral deformation M-△2,3 of column flange panel, or the stiffness of connection joints are measured。Two kinds of destruction modes of beam-column connections are analysis。The stress distribution in plate area of the joints are analyzed。Finally,the conclution based on the synthesis processing analysis of experiment data have been obtained。②Through the finite element analyses of the beam-to-column middle connections, the further studying is going on which analyzes destruction modes of beam-to-column middle connections, the plate distribution stress rule and the rigidity of connections. |
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