The invention provides a prestressed partially-encased steel T-shaped composite beam. Based on a prestressed prefabricated
assembly technology, the prestressed partially-encased steel T-shaped composite beam is mainly composed of a prestressed prefabricated rectangular composite beam and a cast-in-place concrete
flange plate. The prestressed prefabricated rectangular composite beam comprises
honeycomb profile steel, tie bars, closed stirrups, first in-beam longitudinal bars, second in-beam longitudinal bars, a plurality of prestressed steel strands, prefabricated UHPC (
Ultra High Performance Concrete) and studs, wherein the tie bars are arranged in holes of the
honeycomb profile steel and are perpendicular to a web of the profile steel; the closed stirrups are arranged between flanges of the
honeycomb profile steel; the first in-beam longitudinal bars are arranged at the inner bottoms of the closed stirrups and are parallel to the
beam length direction; the second in-beam longitudinal bars are arranged at the inner tops of the closed stirrups and are parallel to the
beam length direction; the prestressed steel strands are arranged on the upper portions of the lower flanges of the honeycomb profile steel and are parallel to the
beam length direction; the prefabricated UHPC is arranged between the flanges of the honeycomb profile steel in a filling mode; and the studs are arranged at the tops of the upper flanges of the honeycomb profile steel. The cast-in-place concrete
flange plate comprises double-layer bidirectional steel bars and cast-in-place concrete, wherein the double-layer bidirectional steel bars are arranged in a cast-in-place
flange plate body, and the cast-in-place concrete is arranged at the top of the prestressed prefabricated rectangular composite beam in a filling mode. The prestressed partially-encased steel T-shaped composite beam is excellent in stress performance, the
crack resistance and
flexural rigidity of the beam can be obviously improved, on-site construction is convenient and fast, and the construction period is shortened.