Experimental Research On Behavior Of Flush End-plate Composite Joints Under Positive Moment

The joints are connections of the frame and they can deliver load, so they are the key to the whole frame mechanic behaviour. Semi-rigid end-plate composite joints have advantages, simple conformation, clear loading path, easy to construct and so on. It have better ductility, larger moment resistance and rotational stiffness, so it has a nice foreground used in multiplayer building. Since the information of the semi-rigid composite joints are very limited, study on the factors which effect the mechanic behaviour of joints are rather inadequate, it is the hotspot and the difficulty of the international composite research field at present.Two flush end-plate external joints under positive moment were tested, and one of its column is encased by concrete. The mechanical behaviour under positive moment and the effects of concrete in column flange were synthetically considered.Based on the experience, the effective width of concrete slab, moment capacity and moment-rotation relationship for the semi-rigid end-plate steel-concrete composite joints are analyzed. It can be the basis of engineering practice.The two composite joints was simulated under positive moment by 3-D infinite element software ANASYS in this paper. The interface between column and beam was simulated by TARGE170 and CONTA174. The relative slip between concrete slab and steel beam was simulated by spring element. The calculated results were shown to be in good agreement with the test results.This study is funded by research grant of Jiangsu Committee of Science and Technology(Project No BJ95089) and Jiangsu Construction Bureau(Project No JS200001).