高桩+板桩复合式结构的内力分析方法

对高桩+板桩复合式结构进行内力分析，通过采用SAP2000和PLAXIS有限元分析软件建立不同的计算模型，得出每种模型下高桩和板桩结构的弯矩、轴力、剪力和位移等计算结果，并对结果及其产生差异的原因进行分析。结果表明：仅采用SAP2000的分析模型因高估了土体对板桩结构的支撑作用，其内力计算结果偏小；仅采用PLAXIS2D的分析模型因忽略了高桩结构的变形，其内力计算结果偏大；而采用这两种软件迭代计算的分析模型与PLAXIS 3D模型的计算结果接近，说明该计算模型的结果与实际情况较为吻合。

Internal forces analysis methods of combinatorial structure of sheet piles and tubular piles

Regarding the calculation of combinatorial structure of sheet piles and tubular piles, different analysis methods are compared through finite element analysis software SAP2000 and PLAXIS, the bending moments, axial forces, shear forces and displacements are obtained, these results and the reasons for the differences are analyzed. The results show that the calculation model of SAP2000 will result in a smaller calculated internal force, because it overestimates the soil support to sheet piles. While the PLAXIS 2D will result in a bigger calculated internal force, because it ignores the deformation of tubular piles. The internal force calculation results obtained by using the iterative calculation model of the two software combined are close to the results produced by PLAXIS 3D, which shows that the results of the above method are consistent with the actual situation.