AXIAL CAPACITY OF LIGHTWEIGHT AGGREGATE CONCRETE FILLED CIRCULAR STEEL TUBES COLUMNS SUBJECTED TO ECCENTRIC LOADING
Keywords:Lightweight Aggregate Concrete Filled Steel Tube, Eccentricity Ratio, Thickness to Width Ratio, Length to Width Ratio, Ultimate Bearing Capacity, Composite Construction
This paper presents an experimental study on the behavior of lightweight aggregate concrete-filled steel tubes (LACFT) under eccentric loading. 54 circular specimens with different load eccentricity distances (10, 20 and 35mm); thickness to width ratio (t/D=11.4 and 13.5); and length to width ratio (L/D = 3, 7, and 14) tested to examine the bearing capacity. Significant parameters influencing LACFT column's bearing capacity, failure mechanism and failure mode all studied and analyzed. Comparison between the predicted results by AISC-LRFD and CHN DBJ 13-51-2003 codes showed lower and applicable bearing capacities with slightly overestimated values for L/D≥14 than that measured during the experiments respectively, while the results gained by CHN CECS 28:90 showed a good agreement with the experimental results and slightly overestimated the values for L/D≥ 14 too. This study shows that bearing capacity of LACFT steel columns subjected to eccentric loading is conservative.