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首页> 外文期刊>Engineering Structures >An explicit analytical model for seismic performance of an unbonded post- tensioned precast segmental rocking hollow pier
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An explicit analytical model for seismic performance of an unbonded post- tensioned precast segmental rocking hollow pier

机译：无粘结后张预应力节段式摇摆空心墩抗震性能的显式解析模型

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摘要

To avoid iterative calculation, an explicit analytical model was developed for the deformation capacity of an unbonded post-tensioned precast segmental rocking hollow pier and divided into three statuses: decompression status, yield status and large deformation status. The pier was regarded as an equivalent reinforced concrete monolithic pier at the decompression status, and the compression zone height at the base section was computed explicitly to make deformation calculation non-iterative at the other two statuses. A verified fiber model based on the OpenSees platform was proposed. The proposed deformation capacity model was validated with existing cyclic loading tests and the verified fiber model. A parametric study was conducted to determine the effects of the main design parameters on four coefficients of the idealized flag-shaped hysteretic model based on the proposed deformation capacity model. New formulas were proposed to determine the four coefficients through regression analysis. The flag-shaped hysteretic model with the coefficients determined by the proposed formulas was validated with cyclic loading tests and dynamic history analysis based on the fiber model. The results of this research show that the proposed model for deformation capacity may be simplified into two statuses, and it can serve as a tool to provide loading-deformation curves that have good agreement with experiments and the fiber model. The flag-shaped hysteretic model with the proposed coefficients can accurately predict the maximum displacement response and conservatively predict the dissipation energy capacity for the rocking pier under a strong earthquake shock.
机译：为避免迭代计算，针对无粘结后张法预制节段式空心墩的变形能力建立了显式解析模型，并将其分为减压状态，屈服状态和大变形状态三种状态。该墩在减压状态下被视为等效的钢筋混凝土整体墩，并且显式计算了基础部分的受压区高度，以使在其他两种状态下的变形计算成为非迭代的。提出了一种基于OpenSees平台的验证光纤模型。所提出的变形能力模型已通过现有的循环荷载试验和验证的纤维模型进行了验证。基于所提出的变形能力模型，进行了参数研究，以确定主要设计参数对理想旗形滞后模型的四个系数的影响。提出了通过回归分析确定四个系数的新公式。通过循环载荷试验和基于纤维模型的动态历史分析，验证了具有由所提出的公式确定的系数的旗形滞后模型。研究结果表明，所提出的变形能力模型可以简化为两种状态，并且可以作为提供与实验和纤维模型吻合良好的载荷-变形曲线的工具。提出的系数的旗形滞后模型可以准确地预测最大位移响应，并保守地预测在强烈地震冲击下摇摆墩的耗能能力。

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