This article presents the three multi-story RCC buildings with varied element sizes, materials grades, and varying both sizes and grades that are analyzed through the nonlinear modal time history method using PGA data of past Elcentro 1940 earthquake through ETABS to conduct the analysis. This study focused on the impact of seismic behavior of multi-story buildings with varied element sizes, materials grades, and both, to evaluate displacement, drift, base shear, overturning moments, etc. The findings reveal that models with varied sizes exhibit the lowest maximum story displacement and drift, indicating enhanced stability and reduced lateral movement during seismic events. In terms of shear forces, the varied-size models demonstrate effective load distribution, resulting in lower values compared to the constant-size models. Additionally, both the varied size and grade models show similar overturning moments, while the constant size model experiences higher values due to increased mass. These results underscore the importance of optimizing element sizes and grades to improve structural performance, reduce material usage, and enhance resilience against seismic forces. Finally, it’s concluded that a model with varied element sizes with constant grades is more suitable for construction practice due to its high strength, cost-effectiveness, and ease of execution.
Non-linear Time History Analysis, Non-linear Modal History Analysis, Regular Building, Displacement, Story Shear, Base Shear, Story Drift, Overturning moments
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