| In order to accurately analyze the frequency and vibration mode of steel-concrete composite beams considering shear slip effect,the dynamic characteristics of steel-concrete composite beams are studied based on the dynamic response test.On the basis of the test,the simulation analysis of steel-concrete composite beams is carried out based on ANSYS software.Based on the basic idea of classical dynamics and bond slip theory,the steel-concrete composite beams are proposed Based on the energy method,the free vibration equation of composite beams considering shear slip effect is derived,and the natural frequency and mode shape are obtained.The influence of shear slip effect at the interface of steel-concrete composite beams on the dynamic characteristics of composite beams is explored.The results show that:1)The test beam model of Steel-High performance concrete composite beam is designed and manufactured,and its dynamic response is tested.The test results are analyzed and sorted out to get the frequency and vibration mode of the test beam,which provides an important test basis for the theoretical research of steel-concrete composite beam considering the shear slip effect.2)The simulation model of steel-concrete composite beam is established by ANSYS finite element software,and the modal analysis of the model is carried out.The frequency and vibration mode of the simulation model of composite beam are obtained through analysis.The simulation results are compared with the test results,and the results show that the data of the two models are in good agreement,which shows that the ANSYS model reflects the real dynamic characteristics of the test beam,and verifies that The accuracy of ANSYS model given in this paper.3)The free vibration equation of steel-concrete composite beam considering shear slip effect is derived,and the natural frequency and mode shape are obtained.The frequency and mode shape obtained from the theoretical value are compared with the measured results and ANSYS simulation results.The analysis shows that the three results are in good agreement,which provides a new idea for the theoretical calculation of steel-concrete composite beams.4)By changing the shear slip stiffness,the theoretical frequency obtained from the theoretical formula is compared with that obtained from the two cases of complete interaction and no interaction.The analysis results show that the three cases are quite different,which shows the necessity of considering the shear slip effect. |
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