Steel reinforced concrete composite beam and bending resistance design method of steel reinforced concrete composite beam

The invention relates to the technical field of buildings, in particular to a steel reinforced concrete composite beam and a bending resistance design method thereof, the steel reinforced concrete composite beam comprises a prefabricated main body and a pouring main body, and the prefabricated main body comprises a T-shaped steel part, a reinforcement cage part and a prefabricated concrete part; the T-shaped steel part comprises a web plate, a flange and a plurality of connecting parts, and the connecting parts are arranged at the connecting ends, away from the flange, of the web plate; one part of the web and one part of the reinforcement cage are embedded in the prefabricated concrete part; the precast concrete part and the pouring main body are made of ultra-high performance concrete, the pouring main body is connected with the precast concrete part, and the other part of the reinforcement cage, the connecting part and the connecting end of the web are all embedded in the pouring main body. According to th