Study of the Change in Shear Wall Thickness on High Concrete Structures Under the Influence of Seismic Force

الملخص

Shear walls protect tall buildings from bending or deforming when subjected to horizontal (lateral) forces during high winds, hurricanes, or earthquakes. Shear wall thickness has a significant impact on a building's structural performance. The thicker the thickness, the greater the stiffness and load-bearing capacity, but this can also impact cost, weight, and footprint. Engineers select shear wall thickness based on design requirements, material type, and location. Building codes can provide an indication of the actual performance of an individual concrete element. However, the expected performance of the entire concrete structure cannot be predicted by the code due to the large and variable forces acting on the building. This study compared the structural analysis of a multi-story high-rise building (G+32) under earthquake loads. Five models of the aforementioned high-rise building were studied. The area of each floor was 576 square meters. The first model was a structural building without shear walls, while the second model had constant-thickness central shear walls, the third model had variable-thickness central shear walls, the fourth model had constant-thickness end shear walls, and the fifth model had variable-thickness end shear walls. The analysis and design process were carried out using engineering programs such as ETABS and AUTOCAD, using the American code (UBC97-Uniform Building Code) to determine live and dead loads, as well as earthquake loads. Based on the results of the study obtained from the program, and after comparing the results of the five models under the influence of lateral displacement and floor displacement, it was concluded that the second model, with constant-thickness central shear walls, was the best model compared to the other models in terms of lateral displacement and floor displacement, while the third model, with variable-thickness central shear walls, was the best model compared to the other models in terms of resulting moments.