Calculation Method of Ultimate Punching Bearing Capacity of Unbonded Prestressed Concrete Slab

The calculation method of punching shear bearing capacity of unbounded prestressed concrete slab is presented for the reason that traditional methods mainly depend on experiences. The concrete material is assumed as ideal rigid-plastic material. The Quasi-Coulomb Criterion is taken as the strength criterion of concrete, according to plastic limit theory, and the calculation equation of punching shear limit bearing capacity of unbounded prestressed concrete slab is derived through the establishment of virtual work equation. Comparison of the calculation results based on the presented equation with test results proves that the calculation method in this paper can not only reflect and decide various influencing factors of punching shear ultimate bearing capacity of unbonded prestressed slab, and but also the calculated results are more reasonable, accurate.