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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >Variations between foundation-level recordings and free-field earthquake ground motions: numerical study at soft-soil sites
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Variations between foundation-level recordings and free-field earthquake ground motions: numerical study at soft-soil sites

机译：基础级记录与自由场地震地面运动的变化：软土场地数值研究

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It is typically assumed that accelerograms obtained from ground motion recording instruments adequately installed inside a building can be considered as representative of free-field conditions if the structure is less than 2-3 storeys high and does not feature a basement or a massive foundation system. In this work, such an assumption is verified through nonlinear soil-block finite element analyses, considering the induced seismicity Groningen gas field as a case-study and both types of structures. The capability of the numerical model in adequately reproducing nonlinear soil response and capturing interaction between soil and structure is first verified through a number of analyses and cross-checks. Considering soil profiles at the locations of different recording stations in the Groningen field, together with accelerograms from recent events in the region, the results obtained with the numerical model confirm that recordings from instruments located at the base of lightweight structures are not affected by Soil-Structure Interaction (SSI) effects, neither kinematic nor inertial. Heavy structures with a basement, however, do exhibit recordings with variations with respect to the free-field; these are identified and possible corrections to the recordings are analysed. Another set of analyses then demonstrates that soil consolidation prior to the construction of lightweight structures resting on shallow foundations may instead lead to foundation-level recordings that feature high-frequency ground motion amplitudes slightly lower than their free-field counterparts. Additional simplified analyses show the dependency of the recordings on inertial SSI effects due to deformability of the ground supporting the structure.
机译：通常假设从建筑物内充分安装在建筑物内的地面运动记录仪器中获得的加入仪可以被认为是如果结构小于2-3个楼层，并且不具有基础或大量基础系统的基础条件。在这项工作中，通过非线性土壤阻滞有限元分析来验证这种假设，考虑到诱导的地震性格兰顿气田作为案例研究和两种类型的结构。通过许多分析和交叉检查验证了数值模型在充分再现非线性土壤反应和捕获土壤和结构相互作用的能力。考虑到格罗宁根的不同记录站的地点的土壤曲线，与该区域的最近事件一起加上加速局，用数字模型获得的结果证实，来自位于轻质结构基部的仪器的录像不受土壤的影响结构相互作用（SSI）效应，既不是运动也不是惯性。然而，具有地下室的重型结构确实表现出具有相对于自由场的变化的录音;将识别出这些，并分析对录音的可能校正。另一组分析然后证明了在浅层基础上搁置轻质结构之前的土壤固结可以导致基础级记录，其具有比其自由场对应物略低于其略微低的高频接地运动幅度。额外的简化分析显示由于支撑结构的地面可变形性，录制对惯性SSI效应的依赖性。

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