Experimental And Theoretical Research On Double-laminated Composite Beam

The double-laminated composite beam is a structure with two sliding surfaces that connect the material with different mechanical properties at two interface points by using a relatively reasonable combination.Such as: steel fiber reinforced composite beams,the use of carbon fiber reinforced steel-concrete composite beams and other structural forms.Compared with the ordinary steel-concrete composite beams,due to the double layer composite beam has two interfaces.The force state and the deformation state calculation become complex.In order to study the static response of displacement,stress and interface slip under the vertical load of double deck composite beams.Taking the carbon fibersteel-concrete composite beam as an example,the force characteristics and calculation method of the double-layer laminated composite beam are systematically studied by laboratory test and theoretical study.The main content of this paper includes:1.Through the indoor experiment of carbon fiber-steel-concrete composite beam,the displacement and strain of the test beam are obtained,and the distribution law of the strain along the beam length is obtained.2.Based on the finite element method,ANSYS finite element method is used to simulate the composite beam of double layer composite surface,and a reasonable finite element model is provided for the static analysis of double-deck composite beam.3.Based on the elastic theory and structural mechanics,the carbon fiber-concrete-concrete double layer composite face beam is taken as an example,and the shear slip effect of the two interface beams is considered.Static response under load.4.Based on the theory of elasticity and the basic idea of finite element,the calculation method of element stiffness matrix of double layer composite face composite beam with two interfacial slip effects is obtained.5.The feasibility of the theoretical results of the double-layer laminated surface composite beam is verified by comparing the results of ANSYS simulation,theoretical calculation and test results.