Abstract
This paper presents the results of an experimental investigation and Finite element analysis of concrete-filled double skin tubes (CFDST) using hot rolled square hollow sections having cross-section of 100 mm for outer tube and 30 mm for inner tube. The annulus between the two steel hollow sections is filled with M-25 grade of concrete. The picture frame testing procedure has been adopted for the analytical and experimental investigations. Two opposite members were provided as CFDST members, while as other two members were provided as normal reinforced cement concrete (RCC) members with equivalent amount of steel as used in CFDST members. The finite element analysis of the frame has been done using Simula Abaqus finite element package. The results were compared with the frames without the CFDST members, i.e. the CFDST members replaced with normal RCC members, which were also experimentally as well as analytically. It was found that the performance of CFDST frame is better than that the conventional RCC member frame. The load-carrying capacity of the frame with CFDST members is above 30% more with lesser deflection in horizontal as well as in vertical direction.
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