Seismic resistance assessment of reinforced concrete high-rise buildings using the linear response spectrum method

Introduction. This study investigates the seismic performance of high-rise buildings using the linear response spectrum method (LRSM). Six buildings of different heights with a frame–shear wall structural system are considered. Natural frequencies and vibration mode shapes were determined, along with contour plots of internal forces and displacements and maps of required reinforcement. The variation of the stress-strain state of the main load-bearing elements depending on the number of storeys and support conditions was analyzed. The limiting number of storeys for the considered structural system under seismic action with an intensity of 9 according to the MSK-64 scale was determined. The influence of increasing building height and foundation stiffness on the dynamic characteristics of the structures was also evaluated.

Materials and methods. The study considers six monolithic reinforced concrete buildings of different heights with a frame–shear wall structural system and different support conditions. The structural analysis was carried out using the linear response spectrum method. The calculations were performed in accordance with current seismic design codes for buildings constructed in seismic regions.

Results. The results made it possible to obtain a quantitative assessment of the applicability of the frame–shear wall structural system for buildings within the considered height range. The influence of the number of storeys and foundation stiffness on the distribution of internal forces, lateral displacements, and the required reinforcement of vertical load-bearing elements was identified.

Conclusions. The obtained results may be used to develop recommendations for selecting structural systems, determining rational cross-sections of vertical load-bearing members, and assessing the permissible height of buildings constructed in seismic regions.

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