Experimental Study on Eccentric Compressive Behavior of Ceramsite Concrete Filled Thin-walled Circular Steel Tube Short Column
When bearing capacity requirements are met,ceramsite concrete filled thin-walled steel tube can further reduce the weight of components and save steel consumption.In order to investigate its eccentric compressive behavior,12 ceramsite concrete filled thin-walled circular steel tube short columns are tested by monotonic static loading,considering ceramsite concrete strength grade,initial eccentricity and steel tube wall thickness as variable parameters.Failure modes,bearing capacity,lateral deflection and steel tube strains are recorded.The test results indicate that all specimens fail in elastic-plastic mode with yielding of thin-walled steel tube and show good ductility;ultimate bearing capacities of specimens decreases with the increase of initial eccentricity.Increasing the thickness of steel tube wall can effectively improve the ductility and ultimate bearing capacity.With the increase of the strength grade of ceramsite concrete,the ultimate bearing capacity increases,but the ductility decreases.The wall thickness of steel tube should match the strength grade of ceramsite concrete.The confinement of thin-walled steel tubes can greatly improve the eccentrical bearing capacity of ceramsite concrete short columns.Based on the test data,the eccentric bearing capacities of the specimens are estimated according to the relevant codes of China,USA and UK.It is found that the calculated bearing capacities of the Chinese code CECS 28:2012 Technical Specification for Concrete-filled Steel Tubular Structures are most closed to the test ones.Thus this code can be recommended to predict the compression-bending capacity of ceramsite concrete filled thin-walled circular steel tube column.
万方数据
维普
