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Influence of soil-structure interaction on the site-specific seismic demand to masonry towers

机译：土壤 - 结构相互作用对砌体塔的场地特异性地震需求的影响

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摘要

Joint analysis of hazard and fragility is becoming a widespread and unavoidable tool to estimate losses caused by earthquakes. The application of such analysis to buildings on soft soil is improved when the dynamic soil foundation - structure interaction is considered, since both the reference hazard on site and the structural performance are modified by soil compliance. This study investigates and compares the site-specific seismic demand required to squat or slender masonry towers settled on stiff or soft soil. To this aim, 96 non-linear dynamic analyses were performed on 3D models, including soil, foundation and structure and excited by fourteen unsealed records of real earthquakes. Distributions of the equivalent bending rotation of structure and of peak and residual rotations of foundation were calibrated on numerical results and convoluted with the hazard curves of three Italian cities, to compute the mean annual rate of exceeding different values of structural and foundation demand. The resulting curves highlight that soil deformability enhances the bending demand and produces a not negligible permanent tilt in towers.
机译：危险和脆弱性的联合分析正在成为估算地震造成的损失的广泛和不可避免的工具。当考虑动态土壤基础结构相互作用时，改善了这种分析对软土的建筑物，因为土地上的参考危害和结构性能都是通过土壤依从性的修改。本研究调查并比较了蹲下或细长砌体耸立在僵硬或软土壤中的蹲下特异性地震要求。为此目的，在3D模型上进行96个非线性动态分析，包括土壤，基础和结构，并受到真正地震的十四个未密封记录的兴奋。结构和基础的峰值和剩余旋转的分布在数值结果上校准了数值结果，并与三个意大利城市的危险曲线旋转，计算了超过结构和基础需求价值的平均年度率。由此产生的曲线突出显示土壤可变形性增强弯曲需求，并在塔中产生不可忽略的永久倾斜。

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