Method for manufacturing a prestressed composite beam (preflex beam)

摘要

In the present invention, a prestressed composite beam (hereinafter, referred to as a " prestressed composite beam ") is formed by placing a concrete on a lower flange of a -Prestressed Composite Beam). The prestressing load more than the design load, which is increased by the additional load, is calculated considering the additional load required to compensate the loss stress of the concrete due to the residual stress of the I-beam. The concrete stress is lost due to the compressive stress loss of the concrete by correcting the compressive stress loss of the concrete corresponding to the tensile stress loss of the I-shaped steel due to the residual stress by introducing the flip stress. It is possible to solve problems such as beam breakage and the like, Thereby simplifying the manufacturing process of the composite beam, thereby shortening the air and reducing the construction cost.