Study On Numerical Analysis Method Of Wood-Concrete Composite Structure

The Timber-concrete composite beam uses shear connectors to promote the work together of the wooden beams and concrete slabs.The concrete slabs are mainly subjected to pressure,and the wooden beams are mainly subjected to tension,making full use of the characteristics of the two materials.The Timber-concrete composite beam is more environmentally friendly than the reinforced concrete beam;compared with the pure wooden beam,its rigidity and strength are improved,so the Timber-concrete composite beam has broad application prospects.In this paper,the numerical analysis of Timber-concrete composite beams is carried out by various numerical calculation methods.Based on the basic idea of finite element method,the node's freedom and displacement modes of Wood-Concrete composite beams are combined,and wood beams,concrete slabs and connectors are considered as a whole to form Wood-Concrete composite beam elements.The main work of this paper is as follows:Firstly,based on the energy method and the direct stiffness method,the finite element formula of the Timber-concrete composite beam is established,and the Timber-concrete composite beam element is obtained.Secondly,based on the finite element formula of Timber-concrete composite beam,the Fortran language is used to compile Computer program,the finite element program calculation method is proposed,and the Timber-concrete composite beam is numerically calculated.The results of comparison with test beams and examples show that:the calculation results of this method are basically consistent with the results of the tests and the examples,indicating that this method can accurately simulate the mechanical characteristics of Timber-concrete composite beam.Thirdly,through the secondary development function of ABAQUS,the user subroutine is compiled for the Timber-concrete composite beam unit,and the user unit of the Timber-concrete composite beam is obtained.The numerical calculation of the Timber-concrete composite beam is carried out by using the user unit.Comparing with the test beam and the examples,the result shows that the user unit of the Timber-concrete composite beam established in this paper is very accurate and the error is small.In the last,the three-dimensional refined finite element model of the Timber-concrete composite beam was established by ABAQUS conventional modeling method.The Timber-concrete composite beam was numerically calculated.The result shows that its result is slightly larger than the test results,but the laws are basically the same.Finally,the limit state of the Timber-concrete composite beam is studied.A three-dimensional refined finite element model of Wood-Concrete composite beams is established by using ABAQUS conventional modeling method.The results are compared with those of test beams.The numerical calculation of Wood-Concrete composite beams is carried out.