Recently many investigations have been conducted to evaluate and analyze various type of structural system, from which frame tube system is a new edition to the structural system. It is a three dimensional space structure composed of three, four, or possibly more column joined at or near their  edges to form a vertical tube-like structural system capable of resisting lateral forces in any direction by cantilevering from the foundation The efficiency of this system is derived from the great number of rigid joints acting along the periphery, creating a large tube. Exterior tube carries all the lateral loading structurally, the framed-tube is superior to a rigid frame because it places material on the exterior of the building. The entire interior structural system is secondary -designed to carry only gravity loads to the ground level.