TY - JOUR AU - Talaeitaba, Sayed Behzad AU - Nazari, behrang TI - Stiffness Reduction Factor of Flat; Beam-Column and Waffle Slabs under Lateral Load JO - International Journal of Advanced Structural Engineering VL - 12 IS - 2 SP - 671 EP - 687 PY - 2022 DO - 10.1007/ijase.2023.1973609.1064 ER -