Experimental Study On The Shear Behavior Of Concrete Filled Double Stainless Steel Tube

The offshore platform have great significance to the development of our national economy,which is an important form of marine engineering.In order to improve the anti-disaster capability of the offshore platform,a composite structure of concrete filled double stainless steel tube was proposed,which changed four steel jackets.In order to ensure the stiffness of the four jackets,the shear resistance and its influencing factors should be studied.This paper is divided into three parts to conduct the research: first,study the configuration of high strength self-compacting concrete and its influencing factors;second,study the properties of stainless steel and ordinary steel,the standard specimen and non-standard specimen,and study the relationship between them;third,study the shear behavior of concrete filled double stainless steel tube.Study the main influencing factors of the high strength self-compacting concrete and self-compacting mortar,the influence of water binder ratio,mineral fines content and mixing method on the strength of self-compacting concrete is mainly studied.Also study the influence of water binder ratio,fine aggregate and strength grade of cement on the strength of self-compacting mortar,and determined the optimum mix proportion of the high strength self-compacting mortar.Study the properties of steel,cause of processing the standard specimen is much expensive than processing the non-standard specimen,so by the research of standard specimen and non-standard specimen,to study the relationship between standard specimen and non-standard specimen,thereby reducing the cost.Moreover the effect of different stretching speed on the mechanical properties of steel was studied with tensile rate.In order to study the rocking column structure of the offshore platform with rocking column,5 specimens including 1 solid specimens and 4 concrete specimens each with different strength were made for shearing tests at three points.The shearing capacity,failure mode and load displacement curve of concrete filled double stainless steel tube were studied and compared with ABAQUS finite element analysis software.