| As a simple traditional structure,which have simple transmission way and good economical benefits,which can increase the net height of the building while effectively reducing the height of the building,RC slab-column structure has been widely used in the construction of warehouses,hospitals,underground garages and other low-rise buildings.However,Brittle punching shear failure of slab-column connection is easy to occur under vertical load,and the successive failure of connections will lead to the collapse of the whole structure,the problem of punching shear failure limits the popularization of slab-column structure.Therefore,the punching failure mechanism of slab-column connections under vertical load and the calculation of punching shear capacity still need to be further studied.To address these issues,the research carried out hereby incorporated finite element analysis and theoretical analysis.The main research work is as follows:(1)Punching shear behavior of RC slab-column connection and RC slab-column connection with studs under vertical load were simulated in ABAQUS.Based on the feasible finite element analysis and the accurate model,Firstly,the failure mechanism of slab-column connections is analyzed with simulation results,It is considered that the failure of the connection is a kind of cable failure and the existence of studs hinders the development of the crack and affects its development Angle;Secondly,the influence of studs strength,studs diameter,studs number,studs vertical arrangement angle and studs plane arrangement on punching shear performance of slab-column connections were studied.(2)Firstly,A punching shear capacity calculation model of RC slab was built based on the modified compression field theory(MCFT).Considering the effect of reinforcement ratio on punching shear capacity,the formula of punching shear capacity of RC slab was presented;By comparing with the experimental results,the accuracy of the formula is verified.Secondly,Based on calculation methods in this paper and GB50010-2011,combined with the results of FEA and experimental data,two formulate of punching shear capacity and corresponding structure design requirements of RC slab with studs were presented;Both of these methods can provide some reference for the establishment of the method for calculating the punching shear capacity of RC slab with studs in the code of GB50010-2011. |
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