| 摘要 |
A method of post-tensioning a truss of substantially conventional steel construction provided with concrete encasement or cladding of certain chords while the truss is in a fabrication yard or at ground level before erection and installation in which the structural steel truss is first assembled in a fabrication yard with certain of the chords being provided with formwork. Reinforcing steel and steel tendons are placed in the formwork and concrete is poured to encase the chords of the truss while the truss is positioned horizontally or vertically in the fabrication yard or at ground level. The steel tendons are then partially or fully post-tensioned to provide maximum load support capability. The cladded and partially or fully post-tensioned truss is then lifted to an installation point and a load deck placed on the truss with final post tensioning of the truss then being completed. The truss of the present invention can be used in situations where trusses are used to carry heavy loads over long spans such as bridges, stadiums, convention halls and the like and is especially beneficial when spanning a busy highway or waterway since the trusses are assembled, cladded with concrete and partially post-tensioned before being lifted and placed in an installation site.
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