Steel-UHPC sandwich composite beam

The utility model discloses a steel-UHPC sandwich composite beam which comprises an upper steel plate, bolts, reserved holes, nuts, studs, a lower steel plate, C-shaped channel steel and UHPC, the C-shaped channel steel is connected with the upper steel plate and the lower steel plate through the bolts, and the UHPC is filled between the upper steel plate and the lower steel plate. The upper steel plate, the bolts, the reserved holes, the nuts, the studs, the lower steel plate, the C-shaped channel steel and the UHPC are arranged, separation of three layers of materials in a system can be directly resisted, in addition, the steel framework made of the two steel panels and the C-shaped channel steel can resist pressure generated when the UHPC is poured, and therefore the cost of a mold and an extra supporting frame in the concrete pouring process is saved, and meanwhile the cost is reduced. The UHPC has ultrahigh mechanical property and durability, the bearing performance of the composite beam can be obviously