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Vision-based estimation of vertical dynamic loading induced by jumping and bobbing crowds on civil structures

机译：基于视觉的土木结构人群跳跃和弹跳引起的垂直动态载荷估算

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摘要

People's motion on civil structures induces dynamic loading that may lead to excessive vibrations. The complete characterization of this force distribution over a wide area due to a large number of people is still an unsolved issue. This work presents a measuring technique for the vertical load estimation in case of jumping and bobbing crowd, based on the evaluation of the vertical inertia of the human body. Laboratory experiments verify the proposed model on a single volunteer through standard inertial sensors and then extend it introducing the non-contact measuring technique. The method validation is carried out in a real environment: a stand of the C. Meazza stadium in Milan, dynamically characterized in terms of frequency response function. The load induced by groups of jumping people is estimated with the proposed method and the resulting structure accelerations are computed: the comparison between measured and estimated vibrations shows a very high correspondence in both time domain and main spectral components and, above all, the performances do not get worse as the number of volunteer increases.
机译：人们在土木结构上的运动会引起动态载荷，从而可能导致过度振动。由于人口众多，这种力分布在大范围内的完整表征仍然是一个未解决的问题。这项工作基于对人体垂直惯性的评估，提出了一种用于在人群跳跃和弹跳情况下进行垂直载荷估算的测量技术。实验室实验通过标准惯性传感器在单个志愿者上验证了提出的模型，然后将其引入非接触式测量技术进行了扩展。方法验证是在真实环境中进行的：位于米兰C. Meazza体育场的看台，根据频率响应功能进行动态表征。用所提出的方法估计了一群跳跃人所引起的载荷，并计算了所产生的结构加速度：实测振动与估计振动之间的比较显示出时域和主要频谱分量之间的对应关系非常高，最重要的是，性能随着志愿者人数的增加，情况不会恶化。

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