Research On Compression Bearing Capacity Calculation Method Of FRP-Steel Composite Component

Carbon fiber reinforcement and repair engineering structure is one of the hot research topic in recent years, its application is becoming more and more widely. Of strengthening and repairing concrete structure and masonry structure at present, there has been a systematic study, but in the strengthening and repairing of steel structure is still inadequate. In this paper, the FRP-steel composite component compression bearing capacity were studied of system research.First of all, in this paper, the compressive bearing capacity of FRP-steel composite component were studied, test including 12 paste CFRP of square steel tube specimens and the comparison of 3 not paste specimens. Focuses on the test component, carbon fiber cross section size paste direction (vertical and horizontal paste paste) and strength of CFRP and steel plate configuration than (the product of the CFRP thickness and elastic modulus and the thickness of steel plate and its elastic modulus ratio of the product) of the compression bearing capacity of composite components. Studies have shown that paste CFRP compression bearing capacity of improved component has the obvious effect. With the increase of component section width, to improve the level of capacity; Increase the extent and the strength of CFRP and steel plate configuration than into positive correlation relationship. Longitudinal paste CFRP on compressive bearing capacity of FRP-steel composite component can improve the effect of effect is better than that of horizontal when pasting CFRP.Secondly, based on the FRP-steel composite component force analysis during compression in this paper, a diagram of component is proposed to calculate, brief artifacts can be divided into corner area artifacts and plane area artifacts. Compression bearing capacity of member is composed of three parts, namely the plane area compressive bearing capacity of components, corner area compressive bearing capacity of components and corner area component constraints of planar area component. Through force analysis of simplified diagram, component bearing capacity calculation formula of the load-displacement curve are presented. Through comparing with the test results, verify the effectiveness of bearing capacity calculation formula in a certain range.Finally, this paper established the FRP-steel composite component compression bearing capacity analysis of finite element model, the various factors that may affect the results of finite element numerical simulation are discussed, mainly including contact unit type, material properties, processing, meshing, boundary conditions and loading method, analysis method and so on. Will get the failure mode of the finite element numerical simulation, the ultimate bearing capacity, load-displacement curve respectively with the test of failure modes, ultimate bearing capacity, load- displacement curve is compared, the results show that this paper established finite element model can accurately simulate FRP-steel composite component when compression failure modes, ultimate bearing capacity, load-displacement curve, has a good reliability and applicability. Based on the finite element model to influence the parameters of the CFRP reinforcement effect is analyzed, further verify the compressive bearing capacity of FRP-steel composite component, along with the increase of the ratio of CFRP and steel plate configuration intensity increased; With the increase of component section width, capacity enhancement degree reduced.