Topics in Dynamics of Civil Structures, Volume 4 - Proceedings of the 31st IMAC, A Conference on Structural Dynamics, 2013
Topics in Dynamics of Civil Structures, Volume 4 - Proceedings of the 31st IMAC, A Conference on Structural Dynamics, 2013
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土木结构动力学主题，第 4 卷 - 第 31 届 IMAC 会议记录，结构动力学会议，2013 年
DOI：
10.1007/978-1-4614-6555-3_38
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Istrate M
中科院分区：
文献类型：
--
作者：
Istrate M
这项工作探讨了刚性路面上行走与由厚度为 10 或 20 毫米的 EVA75 泡沫制成的特定类型柔性路面之间的差异。目的是分析人体不同部位运动轨迹如何受到此类路面刚性的影响。该研究方向的最终目的是评估柔性路面对人类测试对象在活跃的人行桥和地板的振动甲板上行走时的振动感知的影响。实验在英国华威大学的结构实验室进行。使用六个红外摄像机对 20 m 长的走道的一部分进行监控。三名配备反光身体标记的测试对象被要求在混凝土制成的走道上行走。名义上，随后在人行道上进行了相同的实验，首先覆盖一层 10 毫米厚的泡沫（醋酸乙烯酯 EVA75），然后覆盖两层厚度为 20 毫米的泡沫。研究了泡沫的机械性能及其对垂直地面反作用力 (GRFz) 的影响（取决于层数）。使用 Vicon 动作捕捉系统追踪附着在人体解剖标志上的反射标记的轨迹。比较在三个支撑表面上行走时所选标记的平均运动幅度。虽然 GRFz 中的第一个峰值随着泡沫厚度的增加而减小，但所有分析标记的位移和加速度的大小都会增加。研究结果表明，人类在不同灵活性的表面上行走可以通过身体各部分的加速度以及力通过骨骼系统在身体中传播的方式来表征。
This work explores the differences between walking locomotion on rigid pavement and a particular type of flexible pavements made of EVA75 foam having thickness of either 10 or 20 mm. The aim is to analyse how human movements, in terms of trajectories of different body parts, are influenced by rigidity of such pavements. This research line is ultimately directed towards evaluation of the influence of flexible pavement on the vibration perception by human test subjects walking over vibrating decks of lively footbridges and floors.The experiments were carried out in the Structures Laboratory at the University of Warwick, UK. A part of a 20 m long walkway was monitored using six infrared cameras. Three test subjects, instrumented with reflective body markers were asked to walk over the walkway made of concrete. Nominally the same experiments were then conducted on the walkway covered with one 10 mm thick layer of foam (ethyl vinyl acetate EVA75) first, and then with two layers of foam having thickness of 20 mm. Mechanical properties of the foam and its influence on the vertical ground reaction forces (GRFz) depending on the number of layers are studied. The trajectories of the reflective markers attached to the human anatomical landmarks are traced using the Vicon motion capture system. Averaged amplitudes of movement for chosen markers are compared for walking over the three supporting surfaces. While the first peak in the GRFz decreases when increasing thickness of the foam the magnitudes of displacements and accelerations of all analysed markers increase. The findings reveal that human walking on surfaces of different flexibility can be characterised by acceleration of body segments as well as by the way the forces propagate through the body via skeletal system.