Chen Shi-Shuenn, Kao Chi-Jou, Shi Jun-Yang
Department of Civil and Construction Engineering, National Taiwan University of Science and Technology, Taipei, 106, Taiwan.
Department of Civil and Environmental Engineering, National University of Kaohsiung, Kaohsiung, 811, Taiwan.
Sci Rep. 2023 Nov 6;13(1):19163. doi: 10.1038/s41598-023-46046-7.
Torsional vibration, considering soil-structure interaction, is essential to the dynamic response of most irregular structures. A systematic method is developed to seek the optimal simplified model among multiple model candidates for uniform soil on rigid base regarding dynamic soil-foundation interactions. A generic model is identified by the proposed method to simulate the cylindrical foundation resting on or embedded in the soil stratum under torsional vibrations. Various soil-foundation parameters, mainly including embedment depth, layer depth, and mass ratios, are considered in the simplified analysis. The frequency-magnification curves and resonant responses of the foundation using the generic model agree well with theoretical solutions. The resultant resonant magnification factors against mass ratios clearly illustrate the impacts of the whipping effect resulting from the soil-foundation interactions. The generic model performs better and adopts fewer parameters than the existing model to simulate the soil-foundation interactions. In addition, dimensionless parametric charts are presented to estimate foundation responses for engineering applications quickly. The proposed charts also significantly overcome the limitations of the Wolf and Paronesso model. The generic model shows efficiency and accuracy in simulating the soil stratum. This research could contribute to the foundation vibration analysis for torsional responses.
考虑土-结构相互作用的扭转振动对于大多数不规则结构的动力响应至关重要。针对刚性基础上均匀土体的动力土-基础相互作用，开发了一种系统方法，用于在多个候选模型中寻找最优简化模型。通过该方法识别出一个通用模型，用于模拟扭转振动下置于土层上或埋入土层中的圆柱基础。简化分析中考虑了各种土-基础参数，主要包括埋深、层深和质量比。使用通用模型得到的基础频率放大曲线和共振响应与理论解吻合良好。针对质量比的共振放大系数清楚地说明了土-基础相互作用引起的鞭梢效应的影响。与现有模型相比，通用模型在模拟土-基础相互作用时表现更好且采用的参数更少。此外，还给出了无量纲参数图表，以便快速估计工程应用中的基础响应。所提出的图表也显著克服了Wolf和Paronesso模型的局限性。通用模型在模拟土层方面显示出效率和准确性。这项研究有助于基础扭转响应的振动分析。
