Biomechanically Inspired Modeling of Pedestrian-Induced Vertical Self-Excited Forces
Biomechanically Inspired Modeling of Pedestrian-Induced Vertical Self-Excited Forces
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DOI：
10.1061/(asce)be.1943-5592.0000490
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发表时间：
2013-12-01
影响因子：
3.6
通讯作者：
Burn, Jeremy F.
中科院分区：
文献类型：
--
作者：
Bocian, Mateusz;Macdonald, John H. G.;Burn, Jeremy F.
虽然已经提出了许多行人动态载荷模型，但通常忽略了步行者和受激结构之间可能的双向相互作用，特别是对于垂直振动。这个缺点是由于缺乏结构运动中步态适应策略的数据，因此，缺乏一个可靠的基本行人模型，能够捕捉两个动态系统之间的潜在关系。为了解决这一不足，目前的方法，生物力学启发倒立摆行人模型已被应用到人与结构的相互作用问题。该模型的行为进行了研究时，受到垂直运动的支撑结构，特别是，在潜在的自激力，可以产生。已经确定了一种机制，通过该机制可以巧妙地改变行人脚步的定时，从而对结构产生净阻尼效应，而不一定涉及完全同步。已经发现，取决于桥梁振动频率和行人步频之间的比率，步行者可以有效地充当结构运动的正阻尼器或负阻尼器，但预计对于具有分布参数的一组行人，平均而言，他们的动作是增加阻尼和质量。
Although many models of pedestrian dynamic loading have been proposed, possible bidirectional interactions between the walker and the excited structure are generally ignored, particularly for vertical vibrations. This shortcoming has arisen from scarcity of data on gait-adaptation strategies used in the presence of structural motion and, as a consequence, the absence of a credible fundamental pedestrian model capable of capturing the underlying relations between the two dynamic systems. To address this inadequacy of current approaches, a biomechanically inspired inverted-pendulum pedestrian model has been applied to the human-structure interaction problem. The behavior of the model is studied when subjected to vertical motion of the supporting structure, in particular, in relation to potential self-excited forces that can be generated. A mechanism has been identified by which the timing of pedestrian footsteps can be altered subtly, giving a net damping effect on the structure, without necessarily involving full synchronization. It has been found that depending on the ratio between the bridge vibration frequency and pedestrian pacing frequency, walkers can effectively act as positive or negative dampers to the structural motion, but it is expected that for a group of pedestrians with distributed parameters, their action is, on average, to add damping and mass.