Metal beam system for steel-concrete structures

A metal beam for steel-concrete structures, comprising an elongated plate, a pair of elongated sinusoidal metal wire means each having first and second curved portions on opposite sides thereof, the first curved portions of each wire means being spaced from each other and joined to opposite sides of the elongated plate, the second curved portions of both wire means being joined together to form a triangle having the wire means and the elongated plate as its sides, a pair of elongated bar means on either side of and joined to the second curved portions of each sinusoidal wire means, a metal rod means for supporting the metal beam spaced from each end of the plate and trunk means joining each rod means to the adjacent plate, the bar means terminating at each end in bent portions that are joined to said rod means, a slidable metal member at each end of said plate mounted for movement towards and away from said rod means to compensate for expansion and contraction of said beam, and a loop-shaped means for strengthening the bar means, said loop-shaped means being connected to the bar means at the loop portion and to the trunk means at the end portions thereof.