PRESTRESSED COMPOSITE BEAM CARRIED IN ENTIRE COMPOSITION BY UNIFICATION OF LOWER CASING CONCRETE AND REINFORCEMENT OR STEEL WIRE

摘要

The present invention is to pre-tension the reinforcement or steel wire 30 is placed in the lower casing concrete 20 before the restoration of the steel in the tension state by restoring the steel or steel wire due to the release load of the lower casing concrete 20 due to the release load It does not resist the introduction so as not to affect the compressive force introduced into the concrete, and in the critical state in which the stress of the lower casing concrete 20 changes from compression to tension when the working load is applied, the rebar or steel wire 30 installed in the longitudinal direction is In order to be placed in a state of tensile resistance to achieve a full composite action of the concrete and the reinforcement or steel wire (30). In other words, to minimize the compressive force loss of the prestressed concrete beam during the release process during tensioning the rebar or steel wire (30) to maximize the efficiency of the compressive stress introduced into the concrete, the hypothesis is used after the completion of the prestressed girders The purpose is to obtain effective cross-sectional behavior that induces resistance to tensile forces occurring under load.