Gaute-Alonso Alvaro, Garcia-Sanchez David, Ramos-Gutierrez Óscar Ramón
Grupo de Instrumentación y Análisis Dinámico de Estructuras (GiaDe), University of Cantabria, Santander, Spain.
TECNALIA Basque Research and Technology Alliance (BRTA), Derio, Spain.
Sci Rep. 2022 Jul 21;12(1):12500. doi: 10.1038/s41598-022-16606-4.
A correct modal analysis of girder bridge decks requires a correct characterisation of the deformation of their cross-section, governed by the longitudinal bending of the girders and the transverse bending of the slab. This paper presents a novel method that allows the modal analysis of girder bridge decks by applying a matrix formulation that reduces the structural problem to one degree of freedom for each girder: the deflection at the centre of the beam span. A parametric study is presented that analyses the structural response of 64 girder bridge decks. The study compares the dynamic structural response obtained by the proposed method with that obtained by traditional grillage calculation methods. The method is experimentally contrasted by a dynamic load test of a full-scale girder bridge. As a result of the analysis, the proposed method reflects adequate convergence with the experimental dynamic structural response. The use of the proposed novel analysis method contributes to the intelligent modelling process for the analysis of the dynamic behaviour of bridges opening the way to easily feed a Digital Twin accelerating the demands of the Decision Support System in real time.
对梁式桥面板进行正确的模态分析，需要正确描述其横截面的变形情况，这种变形由梁的纵向弯曲和桥面板的横向弯曲共同控制。本文提出了一种新颖的方法，该方法通过应用矩阵公式，将梁式桥面板的模态分析简化为每个梁的一个自由度问题：梁跨中心处的挠度。本文进行了一项参数研究，分析了64个梁式桥面板的结构响应。该研究将所提方法得到的动态结构响应与传统梁格计算方法得到的结果进行了比较。通过一座全尺寸梁式桥的动态荷载试验，对该方法进行了实验对比。分析结果表明，所提方法与实验动态结构响应具有良好的收敛性。所提新颖分析方法的应用有助于桥梁动态行为分析的智能建模过程，为轻松构建数字孪生模型开辟了道路，可实时加速决策支持系统的需求。
