Research on punching resistance of reinforced concrete slab column joints after high temperature
In order to improve the anti-punching performance of plate and column joints after fire,finite element software ABAQUS is used to establish a refined finite element model for anti-punching test of plate and column joints after fire,and the accuracy of the model is verified by comparing with the test results.Based on the verified finite element model,the influence of different reinforcement on the shear performance of plate column joints after fire is studied.The results show that:under the same working conditions,the ultimate bearing capacity of the joints with single and double bending shear bars increases by 15.3％and 17.6％,and the failure displacement increases by 39.2％and 21.5％,respectively.The ultimate bearing capacity and failure displacement of the joints with anchors and bolts are increased by 40.8％and 45.6％,respectively,and 143.1％and 152.9％,respectively.At the same time,the failure modes of the specimen with anchor and anchor bolt are changed into flexural failure.
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