王怀忠. 轴向冲击作用下空心钢管混凝土桩应力波解析解[J]. 工程力学, 2017, 34(4): 101-107. DOI: 10.6052/j.issn.1000-4750.2015.09.0793
引用本文: 王怀忠. 轴向冲击作用下空心钢管混凝土桩应力波解析解[J]. 工程力学, 2017, 34(4): 101-107. DOI: 10.6052/j.issn.1000-4750.2015.09.0793
WANG Huai-zhong. ANALYTICAL SOLUTION FOR STRESS WAVES OF HOLLOW CONCRETE FILLED STEEL TUBULAR PILES SUBJECTED TO AXIAL IMPACT[J]. Engineering Mechanics, 2017, 34(4): 101-107. DOI: 10.6052/j.issn.1000-4750.2015.09.0793
Citation: WANG Huai-zhong. ANALYTICAL SOLUTION FOR STRESS WAVES OF HOLLOW CONCRETE FILLED STEEL TUBULAR PILES SUBJECTED TO AXIAL IMPACT[J]. Engineering Mechanics, 2017, 34(4): 101-107. DOI: 10.6052/j.issn.1000-4750.2015.09.0793

轴向冲击作用下空心钢管混凝土桩应力波解析解

ANALYTICAL SOLUTION FOR STRESS WAVES OF HOLLOW CONCRETE FILLED STEEL TUBULAR PILES SUBJECTED TO AXIAL IMPACT

  • 摘要: 建立轴向冲击作用下空心厚壁圆柱壳的三维轴对称弹性动力学平衡方程,研究钢管与混凝土界面协调运动边界条件,其中波速相等的边界条件确定混凝土圆筒和钢管的波动分别适用于贝赛尔函数和修正贝赛尔函数表示,而质点位移相等和剪切应力相等的边界条件确定波动方程特征值的关系,得出空心钢管混凝土桩的波速和界面上的相互作用剪切应力的解析解,解析解与有限元结果相比较很接近。用解析解计算得出的常用空心钢管混凝土桩相互作用的剪切应力最大值远小于由试验所得出的钢管与混凝土之间的黏结强度值。

     

    Abstract: The dynamic equilibrium equation of a thick wall hollow cylindrical shell subjected to axial impact is presented within the framework of the theory of three-dimensional axisymmetric elastodynamics. With the boundary conditions on the interfaces, the equal wave speed condition determines that the Bessel function and modified Bessel function are suitable for describing the wave of concrete tube and steel tube, respectively, whereas the equal particle displacement and equal shear stress conditions determine the relationship of the eigenvalues. Analytical solutions of wave speed and stresses of hollow concrete filled steel tubular (CFST) piles are obtained, which are close to those of FEM results. The analysis results show that the maximum interaction shear stresses of generally used hollow CFST piles are much less than the bond strength of concrete tube and steel tube obtained by the experiments.

     

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