Effect of Bracing Structural System on the Seismic Response of High-Rise Reinforced Concrete Building for Strengthening with Soft Storey

Bracing is primarily exposed in structures subjected to wind and seismic loads effect—the objective of using bracing is to exhibit resistance to both compressive and tensile forces exerted by the bracing element. Moreover, the braces system indicates high efficiency in resisting horizontal loads. A braced frame enhances the system’s efficiency and provides lateral stiffness to the structure. In order to mitigate the effects of lateral loads and attain sufficient rigidity, structural engineers employed moment-resistant frames and cross-braces. Bracings are constructed to endure seismic loads and increase the ductility that edifices necessitate when exposed to such loads. Adding retrofitting elements to the structure creates a proficient system capable of achieving more significant elevations. The present investigation incorporates seismic parameters such as the effects of soft storeys and uses various bracing types throughout the vertical installation of the structure. It is imperative to ascertain the prerequisites for soft storeys and their requirements on the design. This study investigates a parametric analysis of bare frame systems to the effects of different bracing instalments in buildings with soft storeys. A 10-storey reinforced concrete structure with a regular shape plan was modelled for construction in Zone V. The structural analysis of the building incorporates the implementation of braces and the assessment of soft storey conditions at the ground level. The models offer diverse configurations of X- and V-type bracing systems in both the central and corner configuration throughout the vertical extent of the building. The study analysed structural models using ETABS 18.0.2 finite-element software in accordance with the Indian Standard 1893 (Part 1): 2016 code. The analysis includes the computation of parameters such as maximum storey displacement, drift, story stiffness, base shear value, and time period. The investigation is carried out using name-ly Linear dynamic (Response spectrum Method) and Non-linear static (Pushover analysis method). In conclusion, the provision of bracing systems for strengthening buildings with soft floors will positively impact the performance of buildings.