Mechanical Behaviors Study On GFRP Tube Filled With Reinforced Concrete Members Under Eccentric Compression

In recent year, Fiber Reinforced Polymer (shorten as FRP), is widely used in the field of civil engineering for its advantages in high strength, high efficiency and corrosion resistance. As a result, the research on FRP is more and more deeply, but one of the most representative composite materials is the component as FRP tube.FRP tubes filled with concrete not only can provide an wonderful alternative for concrete effectively subjected to corrosive environments, but also can raise the bearing capacity for the concrete as a permanent formwork, so FRP tubes filled with reinforced concrete component may adapt to the development of modern structures such as long-span, high rise and heavy-load. At present, the FRP structure is mainly used in the aspect of structure reinforcement and at home, the use of FRP in new projects cases of building structure is even not so much. As a result, in this paper, based on the achievements in FRP tube filled with reinforced concrete and steel reinforced concrete, making the structures together into a new structure named GFRP tube filled with reinforced concrete.The author has used experimental and theoretical methods to study the properties of GFRP tube filled with steel reinforced concrete under eccentric compression. The major contents are the following:During the experimental study on the composite column of GFRP tube filled with reinforced concrete under eccentric compression. Some inclusion which shows the properties and identities can get from the specimen destruction phenomenon and experiment diagram. The influence on different wall thickness of tube, different eccentricity different steer ratio and different cross-section are compared. The experimental results show that the bearing compressive capacity of composite columns increase with the thickness increase of GFRP tube, the steel ratio increase and the cross-section of GFRP tube The bearing compressive capacity of composite columns increase rapidly with the decrease of the eccentricity. Steel ratio and cross-section have a significant influence on increasing the structure ductility.In order to relate the theory to the experiment, this article adopts ultimate balance method to calculate the ultimate bearing capacities of eccentric compression components and the formulas are given closely to the experimental results.Based on uniform theory, the ultimate bearing capacities of eccentric compression column and the formulas are given for short.A nonlinear program is used for studying the properties of eccentric compression column by using fiber model method, and it analyzed the effects of wall thickness, component steel ratio, concrete strength, slenderness into account. And the results are close to the experimental results well.