Patent ID: 6915615
Filing Date: 2005-07-12
Classification: E01D

Abstract:
1. A prestressed composite truss girder having a truss structure whereon a slab concrete is composed comprises: a lower-chord member composed of prestressed concrete wherein prestress is introduced to resist against tensile stress and to reduce the displacement generated by external loads and having perpendicular and horizontal cross-section of certain shape and certain length; web member wherein vertical members and diagonal members composed of a steel beam to resist against the shear stress applied on the composite girder are connected alternately with the upper face of said lower-chord member; and upper-chord member composed of a steel plate connected with said web member along the longitudinal direction of said lower-chord member to resist against the compressive force generated before said concrete slab is composed, wherein said lower-chord member comprises a plurality of wire-type strands or tendons placed inside the lower-chord member in the longitudinal direction to introduce the prestress to a certain distribution along the lower-chord member.