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首页> 外文期刊>International journal of structural stability and dynamics >Accurate Dynamic Responses Analysis of Orthotropic Steel Decks Using a Novel Multiscale Time-Varying Boundary Approximation Method
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Accurate Dynamic Responses Analysis of Orthotropic Steel Decks Using a Novel Multiscale Time-Varying Boundary Approximation Method

机译：新型多尺度时变边界近似法的正交钢甲板的准确动态响应分析

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摘要

An accurate evaluation of the dynamic responses on critical components of orthotropic bridge decks is of significance for identifying structural damage and predicting the fatigue life of long-span cable-stayed bridges. However, the traditional finite element (FE) methods are computationally cost-prohibitive for this application. In response, a new multiscale time-varying analysis method based on the dynamic balance equations and FE strategies is proposed and derived theoretically in this paper. Unlike most existing methods, the dynamic responses of this re fined model is easily solved through repeated iterations, using the dynamic responses of a large-scale model as the boundary conditions. To validate the effectiveness of the method, a simply supported steel plate beam was used in a field test that demonstrated good correlation between the analytical dynamic responses and the experimental ones. To further validate this method, a case study involving a whole segment model of the Pingtan Bridge orthotropic bridge deck was established and the complex junction area between the plate and longitudinal ribs was modeled using two refinement processes. For comparison, a sufficiently refined model was also developed using ANSYS software based on the traditional FE methods. This study attempted to provide a new high-efficiency analysis framework for accurate analysis of local vibration problems. Under relatively small and easily manageable calculation conditions at each cross-scale processing level, the proposed method meets not only the requirements of global design for actual engineering applications, but also supports further in depth analysis.
机译：准确评估正交桥甲板的关键部件的动态响应对于识别结构损伤以及预测长跨度缆绳座桥的疲劳寿命具有重要意义。然而，传统的有限元（FE）方法是计算性成本对本申请的成本禁止。作为响应，在本文中理论上提出并从理论上提出了一种基于动态余额方程和FE策略的新型多尺度时变分析方法。与大多数现有方法不同，使用大规模模型作为边界条件的动态响应，通过重复的迭代来容易解决此重新罚款模型的动态响应。为了验证该方法的有效性，在实地测试中使用了简单的钢板光束，该田间测试显示了分析动态响应与实验性的良好相关性。为了进一步验证该方法，建立了涉及平坦桥正交桥甲板的整个段模型的案例研究，并使用两个细化过程建模板和纵向肋之间的复合结区域。为了比较，还使用基于传统FE方法的ANSYS软件开发了充分精细的模型。本研究试图提供一种新的高效分析框架，以准确分析局部振动问题。在每个横级处理级别的相对较小且易于管理的计算条件下，该方法不仅满足了全局设计对实际工程应用的要求，而且还满足了对实际工程应用的要求，而且还在深度分析中进一步支持。

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