[Purposes] This research is conducted to solve the problems of the low applicable height of ordinary concrete-filled steel tubular special-shaped columns and the easy separation of steel tube and concrete at the internal corner. [Methods] Three concrete-filled square steel tubular columns were welded to form an L-shaped composite special-shaped column. and ultra-high-strength grouting... https://macorners.shop/product-category/blue-bottle-lamp-gift-box/