Time series modelling of high performance concrete column shortening due to creep and shrinkage

摘要

The work presented in this paper is the first stage of a research project undertaken at RMIT University, Australia. The project investigates the time series modelling of high performance concrete column shortening in tall buildings, due to elastic, creep and shrinkage, and their impact on the residual stresses induced within the floor systems. The first stage of the program, on which this paper is based on, is a parametric evaluation of the current time series modelling techniques and their net impact on the relative shortening of columns. This paper presents the results of a parametric study which analyses a typical column of a 30, 60 and 90 story building with concrete strengths of 60 and 80MPa. Second stage involves the development of an analytical and decision support tool to be used in the industry. The proposed software tool is capable of estimating relative shortening of the columns, moment re-distribution and the resulting residual stresses within the floor system using Australian, ACI and CEB-FIP standards.