COMPOSITE STEEL-CONCRETE BEAMS FOR SLABS WITH SPACED COLUMNS

Abstract

The invention relates to a composite steel-concrete beam (1) for a floor with a sparse column grid, whose structure comprises: a steel frame (10) acting as non-removable formwork and having the function of reinforcement, and concrete (20) poured inside and enclosing the steel frame (10). The steel frame (10) is structured comprising: bottom trough steel (11) acting as formwork, load-bearing reinforcement and creating two lower flanges (111) for the beam; web steel (12) is T-shaped with legs welded perpendicularly fixed at the centerline of the bottom face of the bottom trough steel (11), acting as load-bearing and structural longitudinal reinforcement, and creating the upper flange (121) for the beam; several anti-bulging round steels (13) are arranged in a staggered manner to stabilize the bottom trough steel (11) with web steel (12) and are located at both ends of the steel frame (10) to act as tensile reinforcement; and many additional load-bearing round steel bars (14) are arranged in the middle span on the bottom of the bottom trough steel (11) to have the role and function of increasing the bending load capacity of the steel frame (10).

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