Research On Continuous Anti-collapse Propertiesof SRC Column-steel Beam Mixed Frame Structure

In recent years,due to the partial destruction of the building structure, resulting in the collapse of a continuous structure, causing serious loss of life and property. Structure progressive collapse has become a threat to public safety is a very important issue, has been more and more researchers’ attention, so the study of the structure of progressive collapse performance has become a hot issue.With Hybrid frame of SRC column-steel beam used framework, and for high-level and multi-bucket structure complex structure system, but the research on its ability to resist progressive collapse in accident condition is still rare.In this paper, experimental studies are now some anti-progressive collapse at home and abroad as well as the outcome of the collapse of a design specification were reviewed,and summed up the anti-collapse building design and analysis methods, and gives the analytical methods used in this study. ABAQUS using finite element analysis software to establish a typical 8-story SRC column- steel beam hybrid frame, choose a reasonable constitutive model and failure criteria, were analyzed using the pushdown pumping column method. After the failure of the internal column and corner column,study the collapse mechanism of structures and the adjacent member internal forces. After the failure of the internal column, a small range of deformation, flexural capacity of the beam provided by the anti-progressive collapse, the beam mechanism stage; In the large deformation range, the ability to collapse by providing continuous tension capacity through node frame beams, namely catenary mechanism stage; When corner column destroyed only provide anti-progressive collapse mechanism through the beam, More likely to cause structural progressive collapse.Finally, through the influence of SRC column- steel beam frame progressive collapse analysis of factors, we know different steel ratio SRC columns, steel girder sectional dimension of the impact of structural progressive collapse. Based on the analysis results, we propose practical measures to optimize the progressive collapse prevention.