INFLUENCE OF PREFORMED HOLES ON FLEXURAL DEFLECTION CALCULATION METHODS OF PRECAST PRESTRESSED CONCRETE RIBBED PANELS FOR COMPOSITE SLABS

Mechanical behaviors in construction phase of PPCRP (Precast prestressed concrete ribbed panels) relate to distributions of preformed holes in the rib. For the convenience of industrialized production and site operation, the specification design is discussed. The general formulas of flexural deflections are deduced, taking into account the distributions of preformed holes in the rib and equivalent rigidity formulas for PPCRP, which are easy to program with MATLAB. The contrast analysis among the inverted camber and remaining camber under dead weight and deflection in construction stage with 5 different distributions of preformed holes is conducted, and the result shows that preformed hole distributions have an obvious effect on the deflections, which decreases with the increase of length of PPCRP. It is suggested that inverted camber can take the average of the deflection calculated by a solid rib model and a through-holes rib model, and the remaining camber under dead weight and deflection in the construction stage can be calculated by the through-holes rib model.