The Oretical Research And Nonlinear Finite Element Simulation Abaqus Of Rectangular Concrete Columns Applied With Cfrp Sheets Under Secondary Load

In recent years the rise of carbon fiber reinforced concrete reinforcement technology, has got more and more attention by virtue of its good performance. Carbon fiber has a high strength, corrosion resistance, light weight, wide application, easy construction. Now there are some problems in the respect of carbon fiber reinforced concrete columns either at home or abroad: ①Most of the studies are focused on the general of RC columns, few studies are for the prestressed CFRP;②The concrete columns reinforced by CFRP are mostly on circular cross-section, but the concrete columns in actual project mostly are rectangular section;③In actual project the reinforced concrete columns are mostly carried load,the load is almost impossible to completely uninstall and then make CFRP, so the system always presence secondary load. In addition, researches about concrete structures reinforced by CFRP are more for concrete beams, plates, and therefore it is very necessary to make expand research to concrete columns reinforced by prestressed CFRP.For questions raised above, the main contents are as follows :1)Consider various factors deduce lateral restraint stress formula about the rectangular concrete columns reinforced by prestressed carbon fiber on the basis of general mechanical model of the concrete cylinder.2)Deduce compressive strength formula of concrete columns reinforced by prestressed carbon fiber on the basis of general theory about concrete columns reinforced by CFRP, and consider the secondary load case.3)Deduce the compressive strength formula under axial compression of RC columns reinforced by prestressed carbon fiber on the basis of compressive strength formula of plain concrete columns reinforced by prestressed carbon fiber.4)Based on the theoretical model derived above, analyze the influence of various factors on the lateral restraint stress, compressive strength, ultimate compressive strain and other mechanical model, and deduce a series of conclusions.5)Using ABAQUS finite element software to simulate factors of the concrete columns reinforced by prestressed carbon fiber, analyze the influence of various factors on the bearing capacity of concrete columns; make simulation of the entire stress process of rectangular concrete columns strengthened with CFRP sheets. KEY WORDS:Prestressed CFRPABAQUSReinforcementSecondary load...