Analysis Methods of Irregular High-Rise Buildings Subjected to Seismic Loads

Background Seismic analysis of structures is required for the design of high-rise building as these are hazards that threat the built environment and human life. However, it was observed that most of the high-rise structures show irregularities in form of mass, stiffness, strength, plan, etc. The irregularities occur due to the architectural designs, non-orthogonal placement of columns, irregular placement of mass in structure, etc. The researchers observed that the irregular structures could not be analysed using the regular methods as given in the design codes as the codes consider the regular structures. Methods Therefore, different methods were developed for analysis of seismic irregularities. The methods for analysing irregular structures under the seismic loads are static methods such as equivalent lateral force method and pushover analysis, and dynamic methods such as Response Spectrum Analysis and Time History Method. Results From the study, it was observed that the non-linear time history analysis, increment dynamic analysis, considers several intensity of ground vibrations to perform nonlinear analysis. Therefore, the method performs well against the other analytical techniques as all the scaled ground motions are recorded to predict the damage due to earthquake. Conclusion Though the method requires high precision, due to high ground vibration sensitivity, and is costly, it shows high accuracy and efficiency.