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首页> 外文期刊>Bulletin of earthquake engineering >In situ characterization of nonlinear soil behavior of vertical ground motion using KiK-net data
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In situ characterization of nonlinear soil behavior of vertical ground motion using KiK-net data

机译：kik-net数据的垂直地面运动非线性土壤行为的原位特征

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摘要

Strong vertical ground motion has significant influences on the seismic response of engineered structures. However, the soil nonlinearity of vertical ground motion has received less attention compared with that of horizontal ground motion. In this study, seismic observations from KiK-net were used to investigate the soil nonlinearity of vertical ground motion. A new fitting formula was proposed to estimate the global constrained modulus degradation curve considering the influence of groundwater. The proposed formula was verified by the higher goodness of fit compared with a widely used fitting formula and the consistency with the theoretical solution from a former study. The order of the magnitude of the normal strain linear threshold was approximately 10(-6)which is the same as that of the shear strain. Furthermore, different from the shear modulus, the constrained modulus of the selected stations decreased quickly when normal strain was between 10(-5)and 10(-4), and the reduction speed slowed down when it was above 10(-4). This result was consistent with the theoretical result based on the laboratory test data from a previous study. Using the fitted relationships between the soil strain and peak ground acceleration (PGA), we found the PGA threshold for vertical nonlinearity could be as low as 30 cm/s(2)and was generally higher than that for horizontal nonlinearity. Moreover, the difference in reduction between the shear modulus and constrained modulus after a strong earthquake was investigated which could be related to the change in Poisson's ratio.
机译：强大的垂直地面运动对工程结构的地震反应具有重大影响。然而，与水平地面运动相比，垂直地面运动的土壤非线性较少受到关注。在这项研究中，kik-net的地震观测用于研究垂直地面运动的土壤非线性。考虑到地下水的影响，提出了一种新的配合式来估计全局约束模量降解曲线。与拟合配合相比，拟议的良好良好验证了所提出的公式，与前一项研究的理论溶液的一致性相比。正常应变线性阈值的大小的顺序约为10（-6），其与剪切菌株的速度相同。此外，与剪切模量不同，当正常菌株在10（ - 5）和10（-4）之间时，所选站的受约用模量快速降低，并且当其高于10（-4）时减慢速度减慢。该结果与基于来自先前研究的实验室测试数据的理论结果一致。使用土壤应变和峰接地加速度（PGA）之间的拟合关系，我们发现垂直非线性的PGA阈值可以低至30cm / s（2），并且通常高于水平非线性的高度。此外，研究了强烈地震后剪切模量和约束模量之间的减少差异，这可能与泊松比的变化有关。

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