The Study On Limit Bearing Capacity Of Composite Beam With Web Openings

Considering the slippage of the steel-concrete interface,this thesis simulates and analyses the deformation and receiving power capability of composite beam under the stage of elasticity;Analysing the effect to composite beam caused by degree of shear connection and the limit bearing capacity of composite beam with web openings under the stage of plasticity.Firstly,the elastic result of the deflection and the limit baering capacity of simply supported composite beam with shear connectors distributed evenly have been carried out when the beam is on the action of load and uniform load.Compared with the results above,the intension got by "conversion section method"without considering the influence of slip effect is larger,the deflection got by "conversion section method"without considering the influence of slip effect is smaller,so it is unsafe for the cacluation of composite beam at the stage of normal use.In this thesis,the deflection and the limit bearing capacity got by the formula considering the influence of slip effect are consistent with the analysis of FEA.Secondly,the paper calculates the steel-concrete composite beams with different degree of shear connection,and considers the effect to the work function of composite beam caused by degree of shear connection from the following three three aspects:the influence to the slip of composite beam caused by degree of shear connection;the influence to the strain distribution of composite beam caused by degree of shear connection;the influence to the deflection and limit bearing capacity of composite beam caused by degree of shear connection.Through the upper anslysis,some valuable conclusions are gained.Finally,through the calculation of numerical simulation by the use of FEA software,this paper compares the numerical results with the theoretical calculation results and verifies that the theoretical calculation is right and applicable,At the same time,three main factors influencing the limit bearing capacity of composite beam with web openings,the size of openings,the position of openings,the shape of openings, are detailed analysed.According to the analysis,this thesis gets that the influences to the limit bearing capacity of composite beam with web openings caused by these factors are non-linear and very regular.