US Patent 12123191 Steel plate built-up beam for steel-concrete composite beam

A steel plate built-up beam for a steel-concrete composite beam, which is for the purpose of forming a steel-concrete composite beam by filing the inside thereof with concrete, includes: a pair of web plates spaced apart from each other; a lower flange provided on the lower portions of the web plates so as to connect the lower portions of the pair of web plates; and upper angles provided on the upper portions of the web plates, respectively, such that one leg of the upper angle is coupled to side surfaces of the web plates, and other leg of the upper angle is formed to bend in directions perpendicular to the web plates.