This paper investigates the behaviour of CONCRETE FILLED DOUBLE SKIN TUBULAR (CFDST) Circular stub columns with steel tubes compressed under concentric axial loads. The CFDST member is a new type of composite construction, which consists of two concentric steel tubes with concrete sandwiched between them. Thus, CFDST columns have a series of advantages, such as high strength, high bending stiffness, good seismic and fire performance, and also having favorable construction ability. The finite element analysis of the CFDST circular column is conducted to validate the finite element model with existing experimental data. The results obtained from the finite element investigation are compared with the strength values predicted using existing formulations in the analytical investigation. A good correlation was found between the values obtained from existing formulations in the analytical investigation.

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Due to increasing population the demand for building became a major aspect . This paper reports on a comprehensive review of state of art on the performance of 3D panels for structural applications under general loading. The seismic performance of buildings using 3D panels is well understood that forces acting horizontally on 3D panel buildings, due to earthquake forces, are transferred most effectively by 3D shear walls. A frame-like design of 3D buildings with heavy reinforcement in the joints is not necessary. 3 D sandwich wall panel is modelled in ETABS. In practical cases the wire used in panels are connected by rigid connectors and it offers truss action . the performance of 3D sandwich panel is understood and hence modelled in regular and irregular buildings using ETAB software