水平地震作用下考虑轴向力作用的桩间动力相互作用因子

Dynamic interaction factor under lateral seismic excitationconsidering the effect of axial load

在N.Markris和G.Gazetas工作的基础上,考虑水平地震作用下桩受轴向力作用,利用梁的动力微分方程,求解桩间动力相互作用因子的简化计算方法。通过分析表明,在轴向力作用较大的情况下,动力相互作用因子的影响较为明显。在对所得结果与前人工作结果比较的基础上,提出考虑轴向力作用时的影响因素,包括桩土之间的弹性模量之比、无量纲频率及桩距等。算例表明,这一方法具有更可靠的计算精度。

Based on the dynamic differential equation of beam, the dynamic interaction factor under lateral seismic excitation considering the effect of axial load is analyzed in this paper. It is found from the analysis under special situation that the large axial load had obvious effect on dynamic interaction factor of group pile. The affected elements are analyzed in comparison with previous result, which mainly are dimensionless frequency, the elastic modulus ratio of pile to soil, and the distance between two piles etc. The numerical results showed that the method is more rigorous to be used to calculate the dynamic interaction factor.