A Dynamics Modeling And Calculation For Bonding Carbon Fiber Beam

Because of disrepair or natural causes, resulting in many houses、bridges that areChina’s previous building houses、bridges, etc can not be used, so the study of their repairand reinforcement is significant. Beams strengthened by carbon fiber sheet, that is paste alayer of carbon fiber cloth in the underside of the beam by the adhesive material to forman overall structure, when the beam of this structure subjects to the loads, the carbon fiberand the beam work and force together, to achieve the strengthening effect. When thebuilding structure due to a variety of reasons, the injury occurs, such as the beamunderside of cracks, etc, because the tensile properties of CFRP is good, so thedevelopment of the cracks in the beam could be well inhibited by pasting a carbon fibersheet in the underside of the beam, thus achieve the purpose of reinforcement to thestructure. The beam which is an important component in the building structure, thereforethe static and dynamic characteristics of the beam has important value.At present, there were many ways to study the beam vibration control, as well asrepair and reinforcement. Recent years there has been a new approach, that bondingcarbon fiber sheet under the beam, so that the whole structure force and working together.Currently, study of this structure is finite element method or the experimental method, butthe results of the finite element method accuracy is affected by the cell division, and theexperimental method is affected by factors of the experimental conditions, the operatinglevel of the experimenter, so results are difficult to reach the required accuracy. Therefore,a high-precision semi-analytical method is proposed.The paper first introduces the basic principles of the precise integration method,elaborate the specific use of the precise integration method, paved the way for the behindcontent of the, they are modeling and calculation of the straight beams、curved beamswith the carbon fiber sheet at the underside, as well as the strength analysis of the curvedbeam with bonding carbon fiber at the underside.Soon after, in this paper, mechanical models were respectively established of straightbeams, curved beams with bonding carbon fiber in the following, using MATLABsoftware to program and calculate, Obtaining their natural frequencies and loss factor inthe case of free vibration, and compare the calculation results with the finite elementmethod results, the data has a good agreement, so fully proved the correctness of themodel which are established in the paper. Also established the model and calculated ofstraight beams with part bonding carbon fiber sheet in the following, which provided acertain theoretical reference values to the structure optimal design.Last, in the paper, the model that the strength of the curved beam with bonding carbonfiber sheet.in the following were established and calculated. And compared the calculatedresults to the finite element method, by comparison, can prove the correctness andaccuracy of the model, Thus provided an important theoretical reference to theengineering that use carbon fiber sheet to reinforce structure.