Analyse de la performance sismique des bâtiments à structures mixtes dans les zones de forte sismicité.

Abstract

This study fills a crucial research gap by examining the optimal placement of shear walls, the ideal shear wall-floor area ratio, and their relationship with building height using non linear static and dynamic analyses. The study employs performance-based seismic design principles, offering a comprehensive approach to seismic analysis and mitigation. Key results include capacity curves, inter-story drift, and performance levels from both non-linear static and dynamic analyses. The findings highlight that increasing the shear wall ratio enhances structural rigidity and reliability in terms of inter-story drift, crucial for achieving the desired performance levels. For instance, a 1.0% shear wall ratio is necessary for a 7-story building, while a 1.5% ratio is essential for a 14-story structure. However, exceeding these ratios can lead to excessive performance levels, proving uneconomical as structural elements operate close to the elastic range. Furthermore, the study shows that concentrating shear walls in the middle of the structure yields superior performance compared to peripheral distributions. Shear walls that completely infill the frame and form compound shapes (e.g., Box, U, and L) enhance reliability, while incomplete shear walls reduce stiffness, leading to the deterioration of short beams. This confirms the reliability of both non-linear static and dynamic analyses, providing valuable insights for optimizing building designs for improved seismic performance.