High-strength steel pipe ultra-high performance concrete simply support and continuous trussed beam and construction method thereof

The invention relates to a high-strength steel pipe ultra-high performance concrete simply supported and continuous trussed beam which comprises a high-strength steel pipe trussed beam formed by fixing a pressed chord member, a web member and a pulled chord member, the pressed chord member and the pulled chord member are filled with UHPC with different performances, the pulled chord member is filled with UHPC doped with steel fibers, and the pressed chord member is filled with UHPC doped with coarse aggregates; a novel welding seam arrangement mode is adopted at the chord member butt joint position of the continuous trussed beam. The material strength is higher, the section combination effect is good, and the spanning capacity of the truss girder is higher; the material performance of the chord member is fully exerted; the structure self-weight is small, and effective bearing capacity is large; the damage of welding to concrete in the pipe is small; construction is convenient, the quality is controllable, and