Techno Press


Steel and Composite Structures   Volume 26, Number 1, January10 2018, pages 79-87
DOI: http://dx.doi.org/10.12989/scs.2018.26.1.079
 
Analysis on natural vibration characteristics of steel-concrete composite truss beam
Lizhong Jiang, Yulin Feng, Wangbao Zhou (Corr. Author), Binbin He

 
Abstract     [Full Text]
    In order to study the natural vibration characteristics of steel-concrete composite truss beam (SCCTB), the influence of multiple factors such as interface slip, shear deformation and moment of inertia are considered. Afterwards, based on the Hamilton principle the vibration control differential equation and natural boundary conditions of SCCTB are deduced. By solving SCCTB differential equations of vibration control, an analytical calculation method is proposed for analyzing the natural vibration characteristics of SCCTB. The natural frequencies of SCCTBs with different degrees of shear connection and effective lengths are calculated by using the analytical method, and the results are compared against those obtained from ANSYS finite element numerical calculation method. The results show that the analytical method considering the influence factors such as interface slip, shear deformation and moment of inertia are in good agreement with those obtained from ANSYS finite element numerical calculation method. This evidences the correctness of the analytical method and show that the method proposed exhibits improvement over the previously developed theories for the natural vibration characteristics of SCCTB. Finally, based on the analytical method, the influence factors of SCCTB natural vibration characteristics are analyzed. The results indicate that the influence of interface slip stiffness on SCCTB\'s natural frequency is more than 10% and therefore cannot be neglected. Moreover, shear deformation has an effect of more than 35% on SCCTB\'s natural frequency and the effect cannot be ignored either in this case too.
 
Key Words
    steel-concrete composite truss; natural vibration characteristics; shear deformation; interface slip; degree of shear connection; analytical solution
 
Address
Lizhong Jiang, Yulin Feng, Wangbao Zhou: 1School of Civil Engineering, Central South University, Changsha, 410075, China
Binbin He: 3State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, CAS, Lanzhou, 730000, China
 

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