In this study, the co-operation of steel and concrete in composite columns is considered. Using numerical modeling to study the behavior of these sections, a new type of sections, namely Concrete Filled Double-Skin steel Tubular (CFDST) columns, is introduced. The parameters and techniques that influence the numerical simulation that bring this modeling closer to...

A convenient family member of composite columns is concrete filled double skin tube (CFDST); it contains two tubes concentric steel and also shell that there between them. The superior or equal potential offering characteristics CFDST are more than counterparts classical (CFST). purposes the present study to provide experimental investigation results into prestressed load-carrying capacity colu...

Structural engineers have assessed the possibility of replacing part natural aggregates with rubber particles in concrete recent years to obtain sustainable structural members. It has been confirmed that use can enhance ductility and energy absorption capacity concrete. By contrast, compressive rubberized (RuC) is usually lower than normal (NC). Confining RuC steel tubes be considered as an app...

In this paper an experimental program on concrete-filled steel tubular columns subjected to eccentric loads is presented. The have different cross-sectional configurations, including single (CFST) and dual (CFDST). response of all the was studied physical state specimens after tests checked. level utilisation achieved by each type column in relation its resistance analysed together with influen...

This paper describes the experimental and numerical study on axial compressive behaviour of circular-in-circular concrete-filled double-skin steel tube (CFDST) stub columns with large void ratio. Nine specimens various ratio (Rv), diameter-to-thickness outer (Do/to) strength concrete (fcu) were tested under compression. The failure patterns, load versus displacement (strain) relationship, ultim...

The concrete-filled double steel tube (CFDST) has been more and widely used in infrastructure due to its greater moment of inertia compared the ordinary (CFST). With increase collision accidents occurring recent years, research on CFDST under impact needs attention. To study dynamic responses columns lateral impact, finite element package ABAQUS was simulate force mid-span deflection column cou...

Concrete filled double-skin steel tubular (CFDST) column comprises two inner and outer tubes with infill concrete between tubes. CFDST columns are used in many structural systems such as offshore structures high rise buildings. The aim of this research is to examine the performance composite frames composed beam under influence lateral loading. were modeled analyzed utilizing ANSYS finite eleme...

An experimental and numerical study into the behaviour of concrete-filled double skin tubular (CFDST) stub columns is presented. A total eight axial compression tests were carried out, four utilising conventional concrete with recycled aggregate concrete. The circular in cross-section each comprised an austenitic stainless steel outer tube a carbon inner tube, varying dimensions. Accordingly, h...