POST-EARTHQUAKE PERFORMANCE OF SELF-CENTERING CONCRETE FILLED DOUBLE SKIN STEEL TUBES COLUMNS WITH EXTERNAL OR INTERNAL ED SYSTEM Research Authors Yehia A. Hassanean Mohamed F. M. Fahmy, Mohamed Y. A. Abbas, Kamal A. Assaf Research Date Tue, 16 Nov 2021 - 12:00 Research Department Civil Engineering Department Research Member Mohamed Youssef Ali Abbas Yahia Abdel-Azim Hassanein Mekhemer Kamal Abbas Assaf Abdul Rahman Mohamed Fathy Mohamed Fahmy Research Year 2021