Behaviour of Recycled Aggregate Concrete-Filled Steel Tubular Columns under Long-Term Sustained Loads

Recycled aggregate concrete-filled steel tube (RACFST) causes the recycled aggregate concrete (RAC) to be in a state of protection with the outer steel tube and thus the RAC is hardly affected by harmful environmental factors (e.g. wind, rain, moist). However, shrinkage and creep are the phenomena commonly associated with concrete-related structures, so studies on the behaviour of RACFST columns under long-term sustained loads are essential for the design of structures which include RACFST members. This study is an attempt to predict the time-dependent behaviour of RACFST columns by using the age-adjusted effective modulus method. The concrete shrinkage and creep in RACFST columns were studied experimentally, and the static bearing capacity of the tested specimens was also investigated. A theoretical model to account for the effects of concrete shrinkage and creep on RACFST columns under long-term sustained loading is developed, and comparisons of the results predicted using this model show good agreement with the test results. Formulae for the calculation of the bearing capacity of RACFST columns under long-term sustained loads are suggested.

[1]  Lin-Hai Han,et al.  Hydration heat and shrinkage of HSS columns filled with self-consolidating concrete , 2005 .

[2]  Lin-Hai Han,et al.  Experimental Performance of Recycled Aggregate Concrete-Filled Circular Steel Tubular Columns Subjected to Cyclic Flexural Loadings , 2009 .

[3]  Lin-Hai Han,et al.  Compressive and flexural behaviour of recycled aggregate concrete filled steel tubes (RACFST) under short-term loadings , 2006 .

[4]  P. Serna,et al.  Creep and shrinkage of recycled aggregate concrete , 2009 .

[5]  J. M. Gómez-Soberón.  Porosity of recycled concrete with substitution of recycled concrete aggregate: An experimental study , 2002 .

[6]  Chuanzeng Zhang,et al.  Mechanical Properties of Recycled Aggregate Concrete Under Uniaxial Loading , 2005 .

[7]  Konstantin Kovler.  Drying creep of concrete in terms of the age-adjusted effective modulus method , 1997 .

[8]  Brian Uy,et al.  STATIC LONG-TERM EFFECTS IN SHORT CONCRETE-FILLED STEEL BOX COLUMNS UNDER SUSTAINED LOADING , 2001 .

[9]  D. Chan,et al.  Influence of steam curing on hardened properties of recycled aggregate concrete , 2006 .

[10]  Andrzej Ajdukiewicz,et al.  Influence of recycled aggregates on mechanical properties of HS/HPC , 2002 .

[11]  A. Katz.  Properties of concrete made with recycled aggregate from partially hydrated old concrete , 2003 .

[12]  Lin-Hai Han,et al.  Effects of Sustained Load on Concrete-Filled Hollow Structural Steel Columns , 2004 .

[13]  Xin Wu,et al.  Concrete Shrinkage and Creep in Recycled Aggregate Concrete-Filled Steel Tubes , 2008 .

[14]  Y. Yang,et al.  Recycled aggregate concrete filled steel SHS beam-columns subjected to cyclic loading , 2009 .

[15]  Lin-Hai Han,et al.  Experimental behaviour of recycled aggregate concrete filled steel tubular columns , 2006 .

[16]  T. Hansen.  Recycling of Demolished Concrete and Masonry , 1992 .

[17]  I. Topcu,et al.  Properties of concretes produced with waste concrete aggregate , 2004 .

[18]  S Nagataki,et al.  Recycling of Demolished Concrete , 2001, "SP-200: Fifth CANMET/ACI Conference on Recent Advances in Concrete Technology-Proceeding, Fifth International Conference".

[19]  C. Poon,et al.  Influence of moisture states of natural and recycled aggregates on the slump and compressive strength of concrete , 2004 .

[20]  Lin-Hai Han,et al.  Analysis of thin-walled steel RHS columns filled with concrete under long-term sustained loads , 2003 .

[21]  Zdenek P. Bazant,et al.  Prediction of Concrete Creep Effects Using Age-Adjusted Effective Modulus Method , 1972 .

[22]  Vivian W. Y Tam,et al.  Comparing the implementation of concrete recycling in the Australian and Japanese construction industries , 2009 .