This standard specifies the terms and definitions, classification and marking, ordering content, technical requirements, test methods, inspection rules, packaging marks and quality certificates of steel trusses for reinforced concrete. This standard applies to steel trusses made of cold-rolled ribbed steel bars and hot-rolled ribbed steel bars by resistance welding. Steel trusses made of other types of steel bars can be used as a reference. This standard applies to industrial and civil buildings, general structures, high-speed railways and other fields.