Finite Element Analysis On Mechanical Behavior Of The New Reinforced Concrete Beam

Concrete beam is an important forced component in building. The dissatisfactionof its carrying capacity can directly limit the performance of the entire building. Inrecent years, a lot of researches have been done on the strengthening of reinforcedconcrete beams, such as the carbon fiber reinforcement which has achieved goodeffects and has been widely used. But only through CFRP to strengthen the concretebeam, the effect will be affected by the compressive capacity of the compression zone.In this paper, the tension zone of the carbon fiber reinforced concrete beam, and thecompression zone of the steel reinforced concrete beam are involved to improve thebearing capacity of the beam. This method will make up for the shortcomings causedby the crushing of concrete in the compression zone. Meanwhile, this paper adopts thewaveform anchorage to anchor the carbon fiber, the common anchorage to anchor thesteel bars. In this way the reinforcement effect is better than the paste. In addition,with the help of ANSYS to analyse different forms of the test beams, through thecomparison of the experimental data to study the mechanical properties of reinforcedbeams as well as to consummate the finite element model.The main work of this paper is presented as follows:⑴A conclusion of the theories about reinforced concrete is given after reading alarge number of literatures. And the simulation analysis is realized through thedifferent test beams based on ANSYS.⑵Abundant researches on the finite element model are conducted, reasonablemodel selection of various materials in the reinforced beam and the constitution of thematerial, as well as the properly selection of data are made to ensure the rationality ofthe finite element analysis.⑶Study the flexural performance and the deflection of the reinforced beam, andthe relationship between stress and strain，map out the appropriate icons. Through thecomparison between the analytical values of the finite element simulation and the experimental values to learn the how the layers of CFRP and the thickness of steelplate affect the ultimate bearing capacity of concrete beam. According to this contrastanalysis, the results are found that the ultimate bearing capacity of the concrete beamincreases as with the increase of the layers of CFRP and the thickness of steel plate.⑷Study the influence of the layers of CFRP and the thickness of steel plate onthe halfway point deflection of the reinforced beam and the steel strain. Both theexperimental value and the finite element show that as the increase of the layers ofCFRP and the thickness of steel plate, the halfway point deflection of the reinforcedbeam and the steel strain decrease gradually. Also the experimental values of theflexural rigidity and the strain value under the same loads are less than thecorresponding values obtained by the finite element calculation.⑸Comparatively analysing the appearance order of the fractures in the commonbeam and the reinforced beam, we can get a conclusion that the carbon fiber and steelplate can delay the occurrence of the cracks as well as change the fracture shape.⑹Investigate the impact of the grade of concrete and the steel reinforcement ratioon the ultimate bearing capacity of the reinforced beams.