MIXED STRUCTURAL BEAM

PROBLEM TO BE SOLVED: To provide a mixed structural beam excellent in execution efficiency and economical efficiency while ensuring regidity, strength, deformed capacity and fire resistance equivalent to a beam having steel framed concrete construction. SOLUTION: A general part 10a occupying the central area of a beam 10 is constructed of prestressed reinforced concrete construction, at the same time, a joint part occupying the end area connected to a column 12 on both sides of the general part 10a is constructed of H-shaped steel materials, it is constituted of the so-called mixed system, and specially, those reinforced concrete construction part and steel framed construction part are monolithically formed. The general part 10a of the beam is so constructed that a beam main bar 14 and a stirrup 16 are buried in a concrete as well as a usual reinforced concrete beam. Specially, PC steel wires 18 are buried into the lower part of a beam depth of the general part 10a by pretension or post tension, and compressive force is introduced to the lower part of the beam depth by the constitution.