Seismic Behavior of Steel-braced RC Frames in Seismic Zone IV

Steel-braced frames play a crucial role in resisting earthquake loads in multi-storied buildings. To mitigate seismic damage, many existing reinforced concrete (RC) frame structures are retrofitted to enhance their load resistance capabilities. The use of steel bracing systems in structures for strengthening and retrofitting during earthquakes provides a structurally efficient means of resisting seismic loads and improving overall building stability. The bracing system of steel is easy to construct and economical. Its space consumption is less and it can be designed for the desired stiffness and strength. This paper presents research work on the performance of RC frame structure buildings in seismic loading conditions rehabilitated by using concentric steel bracing. These bracings are provided in column peripherals. In this study, analysis for seismic zone IV of a four-storey building is done by referring to IS1893:2016 and using the software STAAD Pro V8i. The research focuses on evaluating the efficiency of various bracing systems implemented in the restoration of four-storey structures. The effect of the steel bracing distribution on the height of the building frame for the seismic resistivity performance is studied. This is to ensure the seismic performance, and the effects created in the building are studied. This effect of building is evaluated by using global and local retrofit methods. From this study, it is found that the system of providing bracings that contributes to the structural stiffness and decreases the maximum inner storey drifts is an X-type of bracing system. This study is useful for analyzing the Eight, Twelve, and Sixteen storey buildings.