Seismic Analysis of Multistorey RC Building by Using Staad.Pro V8i

Abstract - The rapid increase in urban population has led to the vertical expansion of cities, resulting in the construction of high-rise buildings. As the height of buildings increases, their vulnerability to seismic forces also increases. In earthquake-prone regions, the structural stability of multistorey reinforced concrete (RC) buildings becomes a critical aspect of design. Seismic analysis, therefore, plays a pivotal role in ensuring that structures can withstand dynamic loads caused by earthquakes. This study focuses on the seismic analysis of a G+14 storey RC framed building using STAAD Pro V8i, a widely used software tool for structural analysis and design in the field of civil engineering. The primary objective of this research is to analyze and understand the seismic behavior of a 15-storey (G+14) RC building, taking into consideration the dynamic effects of earthquake loading. The structure is assumed to be located in Seismic Zone IV (moderately to highly earthquake-prone), and the analysis is performed according to the seismic design provisions of the Indian Standard IS 1893 (Part 1): 2016 and IS 456:2000 for RC design. The modeling includes dead load, live load, and seismic load cases, with combinations formulated as per IS 875 (Part 1 & 2) and IS 1893 standards. The Response Spectrum Method is employed for the dynamic analysis as it provides more accurate results for taller buildings compared to the equivalent static method. In this study, the building is modeled as a regular frame structure using M30 grade concrete and Fe500 steel. The seismic zone factor, response reduction factor, importance factor, and soil type are all input into the STAAD Pro V8i software to generate and apply dynamic seismic loads. Key response parameters analyzed include storey displacement, storey drift, base shear, and natural time period. The software enables visualization of deformation shapes, bending moments, and shear forces, which are essential for evaluating the structural performance during an earthquake. This research concludes that STAAD Pro V8i is an effective tool for seismic analysis and offers valuable insights into the behavior of high-rise RC buildings under dynamic loading conditions. The analytical results assist engineers in designing structures that are both safe and compliant with current codes. Moreover, the findings emphasize the need for incorporating seismic considerations from the early stages of design, especially in regions with high earthquake risk. Keywords: Seismic analysis, STAAD Pro V8i, G+14 building, multistorey RC frame, response spectrum method, base shear, storey drift, lateral displacement, IS 1893:2016, earthquake loading, reinforced concrete design, structural dynamics, dynamic analysis, Indian seismic code, high-rise buildings.