Abstract
To improve the punching shear capacity and ductility of slab-column connections, a new type of slab-column connection embedded with a steel skeleton was proposed and studied. An experimental investigation was conducted by testing a total of nine simply supported slab-column connection specimens subjected to vertical loads. The influences of the type of the steel skeleton, reinforcement ratio, steel content and slab thickness on the punching shear behavior of the composite connections were investigated. The test results indicated that the embedded steel skeleton could effectively improve the punching shear capacity of the slab-column connections, and the structural ductility was increased by changing the failure mode from punching shear to bending-punching. In addition, finite element (FE) software was employed to conduct parametric studies. Simulation results showed that the effects of the reinforcement ratio and the length of I-shaped steel on punching shear behavior of the composite slab-column connections were proved to be significant. Based on experimental and numerical studies, an analytical model was developed to predict the punching shear capacity of the proposed composite connections, and the calculated values were well in agreement with the results of tests and simulations.
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