The effect of the regular distribution of stiffness of vertical elements on the structure’s resistance to earthquakes From the effects of the earthquake February 6, 2023. J.W.P.U [Internet]. 2025 May 15 [cited 2025 Oct. 29];1(3):30-46. Available from: https://wpu.edu.sy/wpuj/index.php/wpuh/article/view/49