Study On Axial Compression Performance Of Self-compacting Concrete Filled Steel Tubular With Considering The Closed Effect

Concrete filled steel tubes which have high strength and high plastic, high durability, economical and practical advantages can apply in a large number of arch bridges, super high-rise and high-rise buildings. Self-compacting concrete filled steel tube is composed of self-compacting concrete and steel tube with excellent construction performance. The application prospects is enormous in some countries which lack human resources. Many domestic and foreign experts make a lot of researches on the mechanical properties and design of concrete filled steel tube structure, but the research work relating with self-compacting concrete filled steel tube structure is still in the initial stage which need to be improved. This paper studies the closed role of steel pipe to bring in the closed-effect coefficient in self-compacting concrete filled steel tube in order to improve the formula of axial bearing capacity. then compareing the calculated value with the trial value, one can verify the rationality of closed effect. Finally, the above test were analyzed by using ANSYS. The main contents are as follows:(1) One can obtain different types of specimens’ axial compression bearing capacity by4different types of specimens in order to draw different types of specimens’strength. Then useing them in different specifications, one can calculate4different axial compression bearing capacity of CFST in order to compare with the trial value. One can get the closed-effect coefficient which can improve the formula of axial bearing capacity of self-compacting concrete filled steel tube by comparing of cylinderical concrete strength with closed and cylinderical concrete strength.(2) One Calculate the bearing capacity concrete filled steel tubular which classify having the yield point and not the yield point by two theories and apply closed-effect coefficient which is suggested in order to gain axial compression bearing capacity which is improved. It is reasonable to verify the axial compression bearing capacity which is considering the closed effect by comparing the improved value and the unimproved value. (3) The use of ANSYS analyses self-compacting concrete filled steel tube model which have yield point or not yield point and obtain2kinds of the stress-strain curves of self-compacting concrete filled steel tube. at last, one make it compare to the stress-strain curves which is tested by the experiment.