孤立的高架桥和桥梁的最佳滑动摩擦系数：比较研究,Structural Control and Health Monitoring

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孤立的高架桥和桥梁的最佳滑动摩擦系数：比较研究
Structural Control and Health Monitoring ( IF 4.6 ) Pub Date : 2021-08-24 , DOI: 10.1002/stc.2838
Paolo Castaldo ₁ , Guglielmo Amendola ₁

Affiliation

这项工作的目的是通过与单个凹面滑动摆隔振器（摩擦摆系统 [FPS]）的地震反应结果进行比较，评估桥墩-桥台-甲板相互作用对桥梁地震反应的影响。不考虑刚性桥台存在的孤立桥梁（即孤立的高架桥）。正确定义了两个不同的多自由度 (mdof) 模型来进行这种比较。在这两种 mdof 模型中，都考虑了五种振动模式来描述钢筋混凝土桥墩的弹性行为，并采用额外的自由度来分析被地震装置隔离的无限刚性桥面板的响应。FPS 隔离器行为通过广泛的速度相关模型进行描述。通过相对于地震烈度的运动方程的无量纲公式，对几个结构特性进行参数分析，以研究与相关响应参数相关的两个 mdof 模型之间的差异。地震输入的不确定性是通过一组具有不同特征的自然记录来考虑的。最后，提供了多元非线性回归关系来估计滑动摩擦系数的最佳值，该值能够最小化桥墩相对于地面的位移，作为考虑或忽略桥台存在的结构特性的函数。对几个结构特性进行了参数分析，以研究与相关响应参数相关的两个 mdof 模型之间的差异。地震输入的不确定性是通过一组具有不同特征的自然记录来考虑的。最后，提供了多元非线性回归关系来估计滑动摩擦系数的最佳值，能够将桥墩相对于地面的位移最小化，作为考虑或忽略桥台存在的结构特性的函数。对几个结构特性进行了参数分析，以研究与相关响应参数相关的两个 mdof 模型之间的差异。地震输入的不确定性是通过一组具有不同特征的自然记录来考虑的。最后，提供了多元非线性回归关系来估计滑动摩擦系数的最佳值，能够将桥墩相对于地面的位移最小化，作为考虑或忽略桥台存在的结构特性的函数。

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Optimal sliding friction coefficients for isolated viaducts and bridges: A comparison study

The aim of this work is to evaluate the influence of the pier–abutment–deck interaction on the seismic response of bridges isolated by single concave sliding pendulum isolators (friction pendulum system [FPS]) through a comparison with the results of the seismic response of isolated bridges without considering the presence of the rigid abutment (i.e., isolated viaducts). Two different multidegree-of-freedom (mdof) models are properly defined to carry out this comparison. In the both mdof models, five vibrational modes are considered to describe the elastic behavior of the reinforced concrete pier, and an additional degree of freedom is adopted to analyze the response of the infinitely rigid deck isolated by the seismic devices. The FPS isolator behavior is described through a widespread velocity-dependent model. By means of a nondimensional formulation of the motion equations with respect to the seismic intensity, a parametric analysis for several structural properties is performed in order to investigate the differences between the two mdof models in relation to the relevant response parameters. The uncertainty in the seismic input is taken into account by means of a set of natural records with different characteristics. Finally, multivariate nonlinear regression relationships are provided to estimate the optimum values of the sliding friction coefficient able to minimize the pier displacements relative to the ground as a function of the structural properties considering or neglecting the presence of the abutment.

更新日期：2021-08-24

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