Research On Dynamic Characteristics Of Steel-Concrete Composite Beams

In recent years,due to the virtues of steel-concrete structures,it has been widely applied in bridge structure,rail transit and building structure in domestic and overseas,and the related technologies is also booming,and achieved favorable economic and social benefits.But due to many factors such as material limit,a lot of problems of composite beams has been shown up,the composite beams with the action of stress and relative sliding principle under the dynamics understanding is not comprehensive enough.So the further research of steel and concrete composite beams is necessary.Based on the composite development situation in domestic and overseas,it can be found that,the static research is thoroughly,but the study of dynamics is relatively weak in domestic and overseas.By the influence of the external conditions of beam has a more complex response,for the safety and comfort of driving of composite structure,Study on the static and dynamic response of the study of composite beams is particularly important.In order to accurately analyze the static and dynamic response of steel-concrete composite beams,based on the contact theory and the basic idea of finite element method,the reasonable unit displacement function of composite beams is the element stiffness equation was derived with the considering of the effect of shear sliding.Combined with the classic theory of dynamics,Provide a method of calculating the natural frequencies and vibration modes of the composite beams without damping with consideration of the shear slip effect on the interface.Through the particular example,the deflection of the simply supported steel-concrete composite beams under the vertical load and the distribution of the shear slip strain difference along the composite beams are analyzed.And compared with the test results.With the stiffness matrix of the above,the composite beam considering shear slip frequency and vibration mode of composite beams was contrasted with the result of full configuration interaction.It is proved that at the calculation of dynamic response,the composite beams should be considered the influence of shear slip.In this paper the static and dynamic response of composite beams are analyzed,and on the basis of static solution,the structure of the natural vibration frequency and vibration mode were analyzed,and the analysis results was contrasted with the finite element simulation analysis results with the software of ANSYS.For practical engineering design provides a reliable theoretical calculation method.