Modélisation 1D-3Compossional de la response sismique d'une colonne de sol multicouche à comportement non linéaire
Modélisation 1D-3Composantes de la réponse sismique d'une colonne de sol multicouche à comportement non linéaire
摘要：
考虑到土壤的3D非线性本构行为，我们提出了一种单向三分量（1D-3C）方法来模拟三分量（3C）地震的单向（1D）传播，用于水平多层土壤的地震响应分析。Masing-Prandtl-Iwan型的弹塑性循环本构行为，仅使用剪切模量衰减曲线进行土壤表征，在有限元方案中实现。土壤剖面的地震响应与入射波的偏振态、介质的弹性和动力特性以及土层间的地震阻抗差异有关。模拟3C信号会引起多轴应力相互作用，降低土壤强度，增加非线性效应。在2011年东北地震期间，东北地区（日本）的土壤剖面受到露头或井下记录的地震信号的影响。每个土壤剖面的非线性地震响应，表示在加速度，滞后回线和应力和应变剖面与深度，比较在两种情况下的叠加三个单分量传播效应（1D-1C）和1D-3C。
英文摘要：
We propose a one-directional three-component (1D-3C) approach to model the unidirectional (1D) propagation of a three component (3C) earthquake for seismic response analyses of horizontal multilayer soils, considering a 3D nonlinear constitutive behaviour for soils. An elasto-plastic cyclic constitutive behaviour of the Masing-Prandtl-Iwan type, using just the shear modulus decay curve for soil characterization, is implemented in a finite element scheme. Seismic response of soil profiles appears dependent on incident wave polarization, elastic and dynamic properties of medium and seismic impedance contrast between soil layers. Propagating a 3C signal induces a multiaxial stress interaction decreasing soil strength and increasing nonlinear effects. Soil profiles in the Tohoku area (Japan) are loaded by seismic signals recorded at outcrops or downhole, during the 2011 Tohoku earthquake. The nonlinear seismic response of each soil profile, represented in terms of acceleration, hysteresis loops and stress and strain profiles with depth, is compared in both cases of superposition of three one-component propagation effects (1D-1C) and 1D-3C.
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