This paper focuses on the theoretical method which could analysis the punching shear strength and deformation capacity. Based on the crack image and load-deformation relationship of laboratory experiments and big data mining of gathered database, the bending-shearing critical crack method (BSCCM) is developed to give the mechanical explanation of punching shear phenomenon in interior slab-column connections without shear reinforcement. According to the tests, the BSCCM assumes that the punching shear force is resisted mainly by the shearing-compression zone of the critical crack section and requires the knowledge of the demand curve and capacity curve of load-deformation relationship of the critical crack, the intersection between the two curves are the punching shear strength and deformation capacity. The capacity curve is defined by layer model of shearing-compression zone based on the biaxial strength theory of concrete. The demand curve is defined by equilibrium of forces in slab sector. The BSCCM also includes flexure-shear crack propagation mechanism, an assumed curvature distribution and the judgment method of critical crack. For engineering practice, two modification factors involving in the size effect and dowel action are also introduced. In the last, an overall process and the global flow chart are demonstrated for illustrating the BSCCM.
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