Andrisman Satria, Chaira and Yunita Arafah 2024. STRUCTURAL ANALYSIS OF SPACE EXPANSION OF CONCRETE BUILDING WITH RETROFITTING STEEL PORTAL. International Journal of Social Science, Educational, Economics, Agriculture Research and Technology (IJSET). 3, 7 (Jun. 2024), 1475–1480. DOI:https://doi.org/10.54443/ijset.v3i7.532.