Analysis of multistoried braced steel space frame subjected to gravity and seismic loading.

Steel structures are generally more flexible than other types of structure and lower in weight. Earthquake loads\ud are random in nature. It is difficult to predict them exactly. The action applied to a structure by an earthquake is\ud a ground movement with horizontal and vertical components. The horizontal movement is the most specific\ud feature of earthquake action because of its strength and because structures are generally better designed to resist\ud gravity than horizontal forces. These forces produce large stresses, strains, deformation and displacement\ud particularly in tall structures. To keep displacement within limit generally bracing is provided in steel structure. .\ud Bracings are generally used to increase lateral-stiffness, lateral- strength as well as lateral stability of the frame.\ud Variations in the column stiffness can influence the mode of failure and lateral stiffness of the bracing. In this\ud study steel frame is modeled and analyzed three Parts viz., (i) Model without Steel bracing (bare frame), (ii)\ud Model completely with fully braced steel frame („Cross‟ bracing), (iii) Model completely with fully braced steel\ud frame („Single diagonal‟ bracing)