The preliminary prerequisite of a structure is to satisfy serviceability conditions, stiffness and safety. The shape and proportions of the structure effects the distribution of forces. Due to irregularities in the structure it will get deficient stiffness at continuous load path and tension capacity will be re-entrant at corners. Steel bracings are retrofitted to increase the strength of RC frame structure and are good rehabilitation technique. Bracing provide high stiffness due to horizontal shear and is primarily absorbed and resist the lateral forces by developing the internal axial action and relatively small flexural actions. Steel bracings are economical, less self weight, good appearance, less spaced occupied, compared with other retrofitting techniques. Steel bracings are known for its efficient structural system for buildings under high lateral loads. The applications of steel bracings are faster to execute. Seismic study is carried out by considering G+15 unsymmetrical RC structures in zone III with bare frame and compared with X-braced frame, single diagonal braced frame, V-braced frame, K-braced frame bracings and static analysis is carried out using ETABS software. These bracing are used at specific locations and results are obtained for Base Shear, Story Displacement, Story Drift, and Time Periods are compared with bare frame models in seismic zone III.
Keywords : Bare Frame (BF), X – Braced Frame (XBF), Single diagonal Braced Frame (SDBF), V- Braced Frame (VBF), K – Braced Frame (KBF).