Time Series Modelling of High Performance Concrete Column Shortening due to Creep and Shrinkage

摘要

This paper presents the results of a research project conducted at RMIT University, Melbourne, Australia, to investigate the column shortening and its impact on floor plates in tall buildings. The study is based on creep and shrinkage time series behaviour models widely sighted for high-performance high-strength concrete, combined with recommended provisions and design guidelines given in ACI 318 (2002), AS 3600 (2001) and CEB-FIP (1990). In this study a Column Shortening Assessment Tool (CSAT), is developed incorporating modified design standards to obtain time series behaviour of vertical load bearing members in tall buildings, including the re-bounce effect due to the steel reinforcement. Parametric evaluation and sensitivity analysis are presented to identify key influencing factors of column shortening. The residual stresses induced within floor plate due to column shortening on the floor systems are also studied using FEA analysis.