Simplified elastic design method using equivalent span ratio for two-way concrete composite slabs with precast ribbed panels

Abstract

This paper analyzes the existing problems in the practical engineering design, resulting from the mechanical properties of two-way composite concrete slabs with precast ribbed panels (CSPRPs). Due to the influence of the structurally orthotropic characteristic, the calculation formulas for the deflection and bending moments of a CSPRP with three supported edges and one clamped edge under a uniformly distributed load are solved using the load superposition method and the orthotropic plate theory. The CSPRP is calculated as an equivalent isotropic cast-in-place two-way slab using the transformation of function, and the application of the equivalent span ratio. The simplified elastic design method is presented for a CSPRP with three supported edges and one clamped edge under a uniformly distributed load. The elasticity coefficients of the CSPRP with the equivalent span ratio, ranging from 0.5 to 1.0 and stiffness ratios of 0.5 and 2 are obtained using the programming calculation. The linear interpolation method is applied using the equivalent span ratio of an isotropic cast-in-place two-way slab, and one example of a CSPRP with three supported edges and one clamped edge is given to verify. The results show that the simplified elastic design method is accurate and feasible.