Andrisman Satria, Chaira, Yunita Arafah. STRUCTURAL ANALYSIS OF SPACE EXPANSION OF CONCRETE BUILDING WITH RETROFITTING STEEL PORTAL. IJSET [Internet]. 2024 Jun. 30 [cited 2026 Apr. 26];3(7):1475-80. Available from: https://www.ijset.org/index.php/ijset/article/view/532