Influence of Concrete Creep on Durability and Reliability Characteristics of Prestressed Composite Slabs

摘要

This theoretical and experimental study relates to the details of a unified design and tests procedure for analytical prediction of various durability, reliability and quality structural characteristics of steel-concrete composite slabs, prestressed in both directions. This analytical procedure is aimed at predicting the quality, stiffness, strength, reliability and durability at the planning phase, the nonlinear creep behaviour of these said composite members. This present ongoing study is so actual, as it is recognized that little information is available on the time dependent factors like the matrix (concrete) creep, shrinkage and loss of stress, in relation to bi-directional prestressing of reinforced steelconcrete composite slabs, with high yield tendons, subjected to long-term service loads. Deformation laws of thin isotropic concrete matrix membranes in a uniform stress state have been applied to solve the composite slab’s problems.