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A Treatment for Truncated Boundary in a Half-Space with 2-D Rayleigh Wave BEM
Taeho Ju,Younho Cho,Haidang Phan,Jan D. Achenbach 한국비파괴검사학회 2011 한국비파괴검사학회지 Vol.31 No.6
Analysis of two-dimensional Rayleigh wave scattering pattern by a surface defect is studied through modified boundary element method. BEM proposed in this paper has special treatment at each end of boundary which should have the Rayleigh wave go away without any generation of virtual reflections. It is shown that treatment for truncated boundary which is used to model two-dimensional Rayleigh waves" behavior in an elastic half-space is successfully implemented. To check numerical results" accuracy, time domain IFFT signal of the displacements is presented. Improvement on getting rid of unwanted influence of truncated boundary induced by 2-D Rayleigh waves on a flat surface of an elastic half-infinite medium is shown. As a final goal, the numerical results of Rayleigh wave scattering trend are plotted and they are compared with theoretical curves to prove its accuracy.
Duy Kien Dao,김인태,Haidang Phan 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.79 No.1
The shear connector is the most important part of a composite beam and promotes a composite action between a steel beam and concrete slab. This paper presents the experiment results of three large-scale composite beams with a newly puzzle shaped crestbond rib shear connector. The behavior of this shear connector was investigated and the results were correlated with those obtained from the push-out-test specimens. Four-point-bending load testing was carried out on steelconcrete composite beam models to consider the effects of the concrete strength, number of transverse rebars in the crestbond and the width of the concrete slab. The results of large scale experimental test include of: the deflection, ultimate load, strains of the concrete, steel beam and Perfobond connectors; the relative slip between the steel beam and the concrete slab at the end of the beams; and the relative failure mechanism. The results showed that the general behavior of a steel-concrete composite beam using Perfobond shear connectors was similar to that of a steel-concrete composite beam using conventional shear connectors such as head stud shear connector. The newly puzzle shaped crestbond shear connectors showed satisfactory performance and could be considered for application in composite structures.
A Treatment for Truncated Boundary in a Half-Space with 2-D Rayleigh Wave BEM
Ju, Tae-Ho,Cho, Youn-Ho,Phan, Haidang,Achenbach, Jan D. The Korean Society for Nondestructive Testing 2011 한국비파괴검사학회지 Vol.31 No.6
Analysis of two-dimensional Rayleigh wave scattering pattern by a surface defect is studied through modified boundary element method. BEM proposed in this paper has special treatment at each end of boundary which should have the Rayleigh wave go away without any generation of virtual reflections. It is shown that treatment for truncated boundary which is used to model two-dimensional Rayleigh waves' behavior in an elastic half-space is successfully implemented. To check numerical results' accuracy, time domain IFFT signal of the displacements is presented. Improvement on getting rid of unwanted influence of truncated boundary induced by 2-D Rayleigh waves on a flat surface of an elastic half-infinite medium is shown. As a final goal, the numerical results of Rayleigh wave scattering trend are plotted and they are compared with theoretical curves to prove its accuracy.