%0 Journal Article %A Talaeitaba, Sayed Behzad, Nazari, behrang %T Stiffness Reduction Factor of Flat; Beam-Column and Waffle Slabs under Lateral Load %J International Journal of Advanced Structural Engineering %V 12 %N 2 %P 671-687 %D 2022 %R 10.1007/ijase.2023.1973609.1064 %U https://sanad.iau.ir/fa/Article/1040245