| While doing seismic design of high rise reinforced concrete buildings, it imposes strictrestrictions on the axial compressive ratio of reinforced concrete column, and causes smallercolumn section. Consequently, it’s forming short or ultra-short columns. However, technologyof split columns is effective in improving concrete short columns in seismic performance.Frame joint design, especially split column frame joint design is very important in the seismicductility of frame structure design.The research object of this paper is the failure mechanism of core area of joints undermonotonic loading. On the basis of the latest domestic and foreign research results of theshort columns and frame nodes, within theoretical analysis and finite element analysis, thispaper studies the stress field and strain field of split column frame joints in its core area, andthe node zone crack development situation.This paper established an analysis model, which includes seven split columns and awhole section column frame joints. By adopting ANSYS finite element analysis andmonotonic loading, the model is divided into three comparison groups and researches thestress field and strain field of split column frame joints in its core area, and the node zonecrack development situation under different circumstances have different length of transitionzone and split form. The study indicates that, setting the transition zone can prohibit the crackdeveloping to the core zone, and the longer the length of the transition zone, the better effectsof the inhibition, and the better the frame joint integrity; The length of the transition zoneextension can improve the joint strength; Split columns with up and down two parts whichhave the same length of transition zone，have the better ductility than other forms of framejoints.The results of the thesis can enrich the theories of the concrete frame joints, and providea reference for the engineering practice of split columns frame joints. |
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