T-beam is mainly composed of concrete and steel bars, with high-grade concrete, generally above C50. Steel skeleton is composed of shear, tension, compression and stirrup, and generally adopts secondary and above steel bars. At present, T-beam is generally tensioned by prestress, and multi-strand steel wire is used for tensioning, which is composed of high-strength steel wire. There are two kinds of tensioning techniques: pre-tensioning method and post-tensioning method, that is, tensioning before pouring or tensioning after concrete pouring reaches strength. Anchors are arranged at both ends of the beam. The composition is basically these.

Function: It is the most important part of the bridge superstructure, bearing the load of the bridge deck system and vehicles, and transferring the load to the substructure. There are bearings (rubber or steel plate bearings) and cushion stones (high strength reinforced concrete) between the beam and the pier, which play the role of fixing the beam and transmitting the load.