KR920012687A - Method of manufacturing prestressed composite beam - Google Patents

Abstract

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Description

Method of manufacturing prestressed composite beam

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1 (a) to (a) is a manufacturing process diagram of the prestressed composite beam according to the first embodiment of the present invention, Figure 2 (a) to (d) is a bending moment and a design maximum bending moment according to the embodiment of the present invention 3 is a stress-strain diagram at the central portion of the I-shaped steel according to the first embodiment of the present invention, and (b) is a stress-strain diagram at the central portion of the I-shaped steel according to the second embodiment of the present invention.

Claims (7)

In the method of manufacturing a prestressed composite beam in which a concrete is placed on the lower flange portion in a state in which the pre-fraction load is loaded on the I-shaped steel 1 camber upward and cured, and then the prestress is removed by removing the load. Internal residual stress is removed by loading the pre-fraction loads P ₁ , P ₂ , and P ₃ at each point of 0.2 L, 0.3 L and 0.4 to 0.5 L, respectively, from the supporting ends along the longitudinal direction of the I-shaped steel (1). After the elastic return to the predetermined range with permanent deformation according to this, the concrete (3) in the lower flange (2) with the pre-flection loads P ₄ , P ₅ , P ₆ at the same time to each loading point And curing), and then applying the prestress by removing the loads P _4, P ₅ and P ₆ . The prestress according to claim ₁ , wherein the prefraction loads P ₁ , P ₂ , and P ₃ are sequentially loaded from the outside at the respective loading points (0.2L, 0.3L, 0.4 to 0.5L). Method of manufacturing a composite beam. The method of claim ₂ , wherein the prefraction loads P ₁ , P ₂ , and P ₃ are 10 to 20% of the design maximum bending moment values at the respective loading points (0.2L, 0.3L, 0.4 to 0.5L). A method for producing a prestressed composite beam, characterized by loading so as to have a large bending moment value. The prestressed composite beam according to claim ₁ , wherein the prefraction loads P ₁ , P ₂ , and P ₃ are simultaneously loaded at the respective loading points (0.2L, 0.3L, 0.4 to 0.5L). Manufacturing method. The method according to claim 4, wherein the prefraction load P ₃ is between 10 and 20% of the design maximum shear force value between the center point (0.5L) of the I-shaped steel 1 and the loading point of the prefraction load P ₂ . A method of manufacturing a prestressed composite beam, characterized in that it is loaded so as to obtain a shear value that is large enough and a bending moment value that is about 10 to 20% larger than the designed maximum bending moment value is obtained. The method of claim 4, wherein between the free fraction of the load P ₂ of the hapha and the free fraction load P _1, i.e., P ₁ + P is the material point of the shear force value corresponding to a load of ₂ 0.2L~0.3L A prestressed composite beam characterized in that it is loaded so as to be 10 to 20% larger than the design maximum shear force value and a bending moment that is about 10 to 20% larger than the design maximum bending moment at the loading point (0.3L) is obtained. Manufacturing method. The shear force value according to claim 4, wherein the shear force value according to the sum of the prefraction load P ₁ and the prefraction loads P ₂ and P ₃ , that is, the load of P ₁ + P ₂ + P ₃ is 0.2L. ) To be 10-20% greater than the design maximum shear force value between the and the support point, and to obtain a bending moment that is 10-20% larger than the design maximum bending moment at the loading point (0.2L). A method of manufacturing a prestressed composite beam, characterized in that. ※ Note: The disclosure is based on the initial application.