Time-dependent behaviour of expansive concrete-filled steel tubular columns
- 30 October 2010
- journal article
- research article
- Published by Elsevier BV in Journal of Constructional Steel Research
- Vol. 67 (3), 471-483
- https://doi.org/10.1016/j.jcsr.2010.09.007
Abstract
Expansive concrete-filled steel tubes (ECFST) are commonly used in modern building and bridge applications. Despite their popularity, limited attention has been devoted to investigate the time-dependent behaviour of such elements. This paper intends to provide new experimental data for the benchmarking of numerical models. Particular attention is devoted to ECFST elements first loaded at quite early concrete ages, e.g. 5 days after concrete casting, to reflect the construction site practice. Eleven ECFST short columns were subjected to different levels of sustained axial loads applied at different concrete ages. Seven columns were then tested to failure to evaluate the long-term effects on their ultimate capacity. The accuracy of four currently available concrete models, EC2, MC90, AFREM and B3, in predicting the long-term response of ECFST elements was investigated based on the related experimental results. Investigation shows that the assumption of linear creep can apply to ECFST elements with initial concrete compressive stresses up to approximately 80% of the concrete strength, rather than the normally accepted upper limit of 40%–50%. During the service life, confinement does not affect the performance of ECFST elements. Model EC2 is adequate to predict the time-dependent response of ECFST elements.Keywords
This publication has 9 references indexed in Scilit:
- Creep and shrinkage in concrete-filled steel tubesPublished by Informa UK Limited ,2021
- Long-term behaviour of square concrete-filled steel tubular columns under axial service loadsMagazine of Concrete Research, 2007
- Long-term behaviour under axial service loads of circular columns made from concrete filled steel tubesMagazine of Concrete Research, 2005
- Effects of Sustained Load on Concrete-Filled Hollow Structural Steel ColumnsJournal of Structural Engineering, 2004
- Analysis of thin-walled steel RHS columns filled with concrete under long-term sustained loadsThin-Walled Structures, 2003
- An experimental study on creep of concrete filled steel pipesJournal of Constructional Steel Research, 2001
- Influence of loading history upon the compressive properties of concreteMagazine of Concrete Research, 1980
- A study of the relationships between time, strength, deformation and fracture of plain concreteMagazine of Concrete Research, 1972
- A stress and time dependent strength law for concreteCement and Concrete Research, 1972