Creep Analysis of Structures with Variable Statistical Scheme-Unified Approach

Abstract

Variation of statistical scheme of reinforced and prestressed concrete structures is frequent in modern construction techniques. Construction sequences may include application of permanent loads and of prestressing in one or more steps, and connection of different portions of the structure, or introduction of additional restraints, at different ages during or after the construction process. This paper presents a unified approach for its evaluation based on the linear theory of viscoelasticity for aging materials, which is normally adopted for modeling concrete creep, evidencing the important role played by the non-dimensional redistribution function describing the creep induced stress variation. The computational procedure is illustrated and an example of application to a typical structural problem is presented.