Abstract IABSE Task Group 3.1 has the mandate to define reference results for the validation of methodologies and programs used to study both stability and buffeting responses of long-span bridges. To this end, the working group set up a benchmark procedure consisting of several steps with increasing complexity to define reference results useful for this validation. The simplest step (1.1a) was presented in Part 1. In this paper (Part 2), the contributions and reference results of the second sub-step (1.1c) are discussed. It consists of the simulation of the aeroelastic response of a three-degree-of-freedom bridge deck section forced by turbulent wind, using experimental aerodynamic coefficients measured in a wind tunnel. The increase in complexity, compared to the previous step, involves the experimental definition of unsteady force coefficients that are defined in a limited range of reduced velocities, and inclusion of the lateral motion and horizontal turbulent wind velocity components. Comparison of the different outputs, obtained by Task Group 3.1 participants with the same input data, is presented, revealing differences that are not always negligible. Moreover, the increase in complexity of the test case results in larger spreads of the results compared to the fully analytical case, analysed in Part 1.

中文翻译：

---

IABSE 任务组 3.1 基准测试结果。第 2 部分：基于实验空气动力学的三自由度桥面截面数值分析

摘要 IABSE 任务组 3.1 的任务是定义用于研究大跨度桥梁稳定性和抖振响应的方法和程序验证的参考结果。为此，工作组建立了一个基准程序，由几个复杂的步骤组成，以定义对验证有用的参考结果。第 1 部分介绍了最简单的步骤 (1.1a)。在本文（第 2 部分）中，讨论了第二个子步骤 (1.1c) 的贡献和参考结果。它包括使用在风洞中测量的实验空气动力学系数模拟由湍流风推动的三自由度桥面板截面的气动弹性响应。复杂性的增加，与上一步相比，涉及非定常力系数的实验定义，这些系数在有限的降低速度范围内定义，并包括横向运动和水平湍流风速分量。呈现了任务组 3.1 参与者使用相同输入数据获得的不同输出的比较，揭示了并非总是可以忽略的差异。此外，与第 1 部分中分析的完全分析案例相比，测试案例复杂性的增加导致结果的更大范围。