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A simplified nonlinear sway-rocking model for evaluation of seismic response of structures on shallow foundations

機(jī)譯：用于評(píng)估淺地基結(jié)構(gòu)地震響應(yīng)的簡(jiǎn)化非線性搖擺算法

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This paper presents a simplified Nonlinear Sway-Rocking model as a preliminary design tool for seismic soil-structure interaction analysis. The proposed model is intended to capture the nonlinear load-displacement response of shallow foundations during strong earthquake events where foundation bearing capacity is fully mobilised. Emphasis is given to heavily-loaded structures resting on a saturated clay half-space. The variation of soil stiffness and strength with depth, referred to as soil non-homogeneity, is considered in the model. Although independent springs are utilised for each of the swaying and rocking motions, coupling between these motions is taken into account by expressing the load-displacement relations as functions of the factor of safety against vertical bearing capacity failure (FSv) and the moment-to-shear ratio (M/H). The simplified model has been calibrated and validated against results from a series of static push-over and dynamic analyses performed using a more rigorous finite-difference numerical model. Despite some limitations of the current implementation, the concept of this model gives engineers more degrees of freedom in defining their own model components, providing a good balance between simplicity, flexibility and accuracy.
機(jī)譯：本文提出了一種簡(jiǎn)化的非線性搖擺搖擺模型，作為地震土-結(jié)構(gòu)相互作用分析的初步設(shè)計(jì)工具。所提出的模型旨在捕獲在充分調(diào)動(dòng)地基承載力的強(qiáng)烈地震事件中淺層地基的非線性荷載-位移響應(yīng)。重點(diǎn)放在飽和粘土半空間上的重載結(jié)構(gòu)。在模型中考慮了土壤剛度和強(qiáng)度隨深度的變化，稱為土壤非均質(zhì)性。盡管搖擺運(yùn)動(dòng)和搖擺運(yùn)動(dòng)均使用獨(dú)立的彈簧，但通過將載荷-位移關(guān)系表示為抵抗垂直承載力失效（FSv）的安全系數(shù)和力矩的函數(shù)，可以考慮這些運(yùn)動(dòng)之間的耦合。剪切比（M / H）。簡(jiǎn)化模型已根據(jù)使用更嚴(yán)格的有限差分?jǐn)?shù)值模型執(zhí)行的一系列靜態(tài)推覆和動(dòng)態(tài)分析的結(jié)果進(jìn)行了校準(zhǔn)和驗(yàn)證。盡管當(dāng)前實(shí)現(xiàn)存在一些限制，但是此模型的概念為工程師定義自己的模型組件提供了更大的自由度，從而在簡(jiǎn)單性，靈活性和準(zhǔn)確性之間實(shí)現(xiàn)了良好的平衡。

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