Load models for flexible pedestrian bridges

Pedelta Canada有兴趣与滑铁卢大学的研究人员合作，为碳纤维和铝等轻质材料建造的人行天桥开发更好的荷载模型。该项目将评估适用于人行天桥的现有荷载模型，特别是加拿大桥梁规范中针对单个行人荷载的标准，并开发一个修改后的模型，以更好地预测实验观察结果。目前，该标准是基于谐波稳态条件，这会产生过于保守的结果，为桥梁的行人激励频率的非共振范围。作为本项目的一部分，将为这种情况编制更适当的负荷系数。此外，公路规范中的动力放大曲线仅适用于阻尼比小于1%的情况。在需要减振器的情况下，这些曲线需要扩展到更高的范围（例如，3-5%）。这些曲线将作为本项目的一部分生成和提供。该项目的主要交付成果是一个软件设计辅助工具，该工具将使Pedelta Canada能够更好地预测轻型人行天桥对单个行人荷载和行人群体的响应。

Pedelta Canada is interested in collaborating with researchers at Waterloo in developing better load models for pedestrian bridges constructed out of light-weight materials such as carbon fibre and aluminum. This project will evaluate existing load models applicable to pedestrian bridges, especially the Canadian Bridge Code criteria for individual pedestrian loads, and develop a modified model to better predict experimental observations. Currently, the criterion is based on harmonic steady-state condition, which produces overly conservative results for bridges in the non-resonant range of pedestrian excitation frequencies. More appropriate load factors for such cases will be produced as a part of this project. Furthermore, dynamic amplification curves in the highway code are available only for damping ratios less than 1%. In cases where vibration absorbers are required, these curves need to be extended to higher ranges (e.g., 3-5%). Such curves will be generated and provided as a part of this project. The main deliverable in this project is a software design aid tool that will allow Pedelta Canada to better predict the response of lightweight pedestrian bridges to individual pedestrian loads and groups of pedestrians.