Experimental Study On Mechanics Capability Of Concrete-filled Square Thin-walled Steel Tube Short Columns

The thin-walled steel tubes Which are adopted in the conerete-filled steel tube engineering are able to economize steel materials and lower the cost of the engineering.But the capacity of concrete-filled thin-walled steel tubular colunlns of which the d/t(b/t) ratio is relatively large is less than the sum of capaeity of the two materials, beeause the tubular will buckle partly before the action is equal to the ultimate capacity. In order to use widely concrete-filled thin-walled steel tubular in the actual engineering, we must take reasonable measures to avoid or put off the buckling of part of the tube.To better solve the thin-walled concrete filled steel tubular short columns local buckling and stability problem in order to improve the overall deformation of the specimen,setting long and short strengthen Rachel reinforced and anchored in the specimen interior,at the same time the static loading test has been performed. Based on the distributed jointing, strengthen Rachel support the armor plate, put off the buckling of part of the tube. And also the Rachel anchored in the concerte strengthen the adhibit of concerte and the wall of steel tube, during the loading process, two materials can exert their capability adequately and enhance the structure or component s performance.Based on the test results, analysis of the effective reinforcement to strengthen the role of Rachel, quantitative indicators are given ductility analysis of steel tube wall thickness, Rachel way, concrete strength on the deformation properties of steel. The results showed that the influence of the bearing capacity were steel pipe wall thickness, concrete strength and the strengthening of reinforced Rachel, for the ductility of the order of the strength of concrete, strengthen Rachel reinforced, the thickness of the wall. Configuration of long and short strengthen Rachel reinforced significantly improve the deformation properties of specimens, and take common specimen's average ductility coefficient of 2.30 as a benchmark, configured with short bar specimen Rachel average ductility coefficient of 2.85, increased by 24%; configuration long steel specimen Rachel average ductility coefficient of 3.34, increased by 45%.Configuration to strengthen Rachel steel, the substantial increase in the deformation properties of the specimen to enhance the safety of the structure to use. The results of this paper can provide an important proof for the furither research and analysis in the abstract on the concrete-filled thin-walled steel tubular colunlns.