竖向行人-结构相互作用中的行人MD及SMD模型参数识别

发布时间：2018-02-05 05:26

本文关键词： 人结相互作用振动舒适度质量块-阻尼器模型弹簧-质量块-阻尼器模型　出处：《振动工程学报》2016年05期 　论文类型：期刊论文

【摘要】：大跨轻柔结构易出现行人荷载下的振动舒适度问题,行人与结构的相互作用是准确预测人致结构振动的关键难题之一。通过一低频人行桥的小组行人试验,研究了两种竖向人-结相互作用模型的参数及其适用性问题。首先由试验获得空桥和有行人时的系统频响函数。随后,将行人的质量-阻尼器(Mass-Damper,MD)模型和本文建议的弹簧-质量-阻尼器(Spring-Mass-Damper,SMD)模型,分别与结构耦合并推导耦合系统的频响函数理论表达式,再拟合实测值识别MD和SMD模型的参数。结果表明:试验条件下行人对结构质量贡献约为体重的40%,阻尼贡献为1400kg/s。行人SMD模型的自振频率约为1.9Hz,阻尼比约30%。行人SMD模型参数尚无其他文献报道,与不同姿态静止人体的SMD参数的对比说明了结果的合理性。最后,利用数值模拟解释了MD模型的局限性,建议采用SMD模型模拟竖向行人-结构相互作用。
[Abstract]:The problem of vibration comfort under pedestrian load is easy to occur in long-span soft structures. The interaction between pedestrians and structures is one of the key problems in predicting the vibration of human-induced structures accurately. A group pedestrian test of a low-frequency footbridge is carried out. In this paper, the parameters and applicability of two vertical human-junction interaction models are studied. First, the frequency response function of the empty bridge and the system with pedestrian is obtained. The mass-damper (Mass-Dampern MDM) model of pedestrians and the Spring-Mass-Damperpern SMD model proposed in this paper are presented. The theoretical expressions of the frequency response function of the coupled system are derived respectively by coupling with the structure. The parameters of MD and SMD models are identified by fitting the measured values. The results show that the pedestrian contribution to the structure mass is about 40% of the body weight under the experimental conditions. The damping contribution is 1 400 kg / s. The natural vibration frequency of pedestrian SMD model is about 1.9 Hz and the damping ratio is about 30. The parameters of pedestrian SMD model have not been reported in other literatures. The comparison with the SMD parameters of stationary human body with different attitude shows the rationality of the results. Finally, the limitation of MD model is explained by numerical simulation. SMD model is proposed to simulate vertical pedestrian-structure interaction.
【作者单位】：同济大学土木工程防灾国家重点实验室;中国海诚工程科技股份有限公司;
【基金】：国家自然科学基金资助项目(51478346)
【分类号】：TU317
【正文快照】： 引言对于固有频率接近人体步行频率的大跨度楼盖、人行桥或人行连廊等,人群的正常走动可能导致较大幅度的结构振动。过大的结构振动会使使用者感到不适,从而影响结构的使用性能。伦敦的千禧桥就因过大的横向振动在使用的第一天被迫封闭,直到两年后安装阻尼器解决振动问题后才

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