Fire Resistance Analysis of the Space Nodes for CFSTRC Column-RC Beam
To investigate the fire resistance of CFSTRC column-RC beam space nodes and provide a reference for practical engineering.The ABAQUS software was used to establish temperature and mechanical field models of CFSTRC column-RC beam space nodes under ISO-834 standard fire.On the basis of the results from test and FEA are in good agreement,the working mechanism of the temperature field distribution,failure mode,deformation and internal force distribution of these members'spatial nodes were analyzed.The CFSTRC column-RC beam temperature at the beam-column joint regions is well below the temperature at the non-joint regions due to the protection of the beam-slab.The fire resistance limit of the joint nodes decreases by 41.58%and 43.75%under the same load ratio of beam and column when the beam increases from 2 to 3 and 4.The core concrete filled steel tube with axial force increases from 43.27%room temperature to 52.9%at 180 min under high temperature and axial compression.CFSTRC column-RC beam space nodes have good fire resistance,which can meet engineering requirements.
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