The Beam Column Effect Analysis And Experiment Study Of CFRP Simply Supported Box Beam

Carbon fiber reinforced polymer (CFRP) is a new type of material which is high-strength and light-weight. In recent years CFRP has been widely used in the engineering field as its some advantages, just as high corrosion resistance and high fatigue resistance, which traditional materials do not have. CFRP can be used as functional materials or structural materials.A box beam which is made up of CFRP is more light-weight than the one which made up of reinforced concrete and the CFRP box beam is also high corrosion resistance and high fatigue resistance, all these characteristics provide a condition for the development goal of a bridge structure to have a longer span. but as a new type of material, the theory and practice experience and the standardization of construction of CFRP are still all in the process of discovery, so for the CFRP box-beams, this article is only calculate the nonlinear reaction by numerical simulation and experimental study when the CFRP box-beams bear axial force and vertical force at the same time. This article is committed to get a correct, reasonable beam column reaction of the CFRP simply supported box-beams, when the CFRP box-beams bear axial force and vertical force at the same time.To get the beam column reaction of the CFRP box-beams which have different layer angles or different wide span ratio, this article decides using the large finite element software ANSYS and a model experiment to realize the intended purpose. In order to smoothly achieve the intended purpose, at the begin of this article firstly introduced the performance of CFRP and its all kinds of use in the bridge engineering field, then introduced the CFRP box-beam’s domestic and foreign research status in the theory and experiment aspects and also the actual application of CFRP box girders. In the theory of computation, in order to understand the CFRP’S mechanical characteristics and the influence factors, this article introduced the constitutive relation and the strength calculation theory of both the CFRP single ply plate and laminated plate, all these theories are come from composite material mechanics. In this article the CFRP has been seen as orthogonal anisotropic materials for analysis. Because the box beam always has a complex status after stress, so in this article gives an introduction of the box beam’s structural characteristics and its stress response. Box girder is a structure which can effectively resist bending and twisting stress, its mechanical characteristics can be illustrated through applying an eccentric load on the box beam. In order to give a clearly expression, this article will introduce the beam column effect and nonlinear effect.The numerical simulation and model experiment are used to contrast and analysis the box girder’s beam column reaction when the CFRP box-beams bear axial force and vertical force at the same time. Through analyzing the relationship between the deflection and the angle of layer, the deflection and the wide span ratio, this article get a conclusion that the stress of a CFRP box girder increases with the incretion of the CFRP’s angle of layer, and increases with the incretion of the wide span ratio too:At the same time, the deflection of a CFRP box girder also increases with the incretion of the CFRP’s angle of layer and the wide span ratio.