摘要
为明确静态人体与轻柔结构之间的竖向相互作用规律,以自主设计制作的简支人行桥模型(基频3.67 Hz、净跨11.80 m)为试验平台,测试了单人人体静立、下蹲与静坐三种姿态及等重质量块对人-结构耦合系统竖向动力特性的影响规律,并结合典型文献试验结果进行了对比与归纳总结。试验结果表明:人体静立、静坐姿态均会降低结构一阶竖向振动频率,而人体下蹲姿态将提高结构一阶竖向振动频率,其中人体静坐姿态对结构一阶竖向振动频率影响程度最大;三种人体姿态均能提高结构一阶竖向模态阻尼比,其中人体静坐姿态提升效应最为显著;采用等重质量块模拟人体,与人体不同姿态对结构振动频率的影响程度基本相当,但无法有效地模拟结构模态阻尼比的变化。综合比较两种结果可知:导致不同文献中人体姿态对结构竖向振动频率与模态阻尼比的影响结果存在离散性的最主要因素为人-结构质量比,其次为人-结构频率比。
To clarify vertical interaction between a static human body and a light and flexible structure,a simply supported footbridge model with the vertical fundamental natural frequency of 3.67 Hz and a span of 11.80 m was designed and manufactured as a test platform to measure effect laws of a standing occupant,a squatting one,a sitting one and corresponding equal weight mass blocks on vertical dynamic characteristics of a human-structure interaction system.The test results were compared with those published in literature.Test results showed that a standing occupant or a sitting one can reduce the first order vertical natural frequency of the system,while a squatting occupant can increase this frequency,and occupant sitting posture has the largest effect on this frequency;three occupant postures all can increase the first order modal damping ratio of the system,occupant sitting posture has the most significant increase effect;corresponding equal weight mass blocks are used to simulate human bodies with three postures,they have almost the same effects on the first order vertical natural frequency of the system,however,they can’t effectively simulate changes of the system’s modal damping ratio.Based on test results here and data published in literature,it was shown that there are two main factors to cause the discreteness of different results in which the most important factor is the ratio of human mass to structure one,and the second one is the ratio of human natural frequency to structure one.
作者
汪志昊
寇琛
刘召朋
李晓克
WANG Zhihao;KOU Chen;LIU Zhaopeng;LI Xiaoke(International Joint Lab for Eco-building Materials and Engineering of Henan Province,North China University of Water Resources and Electric Power,Zhengzhou 450045,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2019年第19期58-63,共6页
Journal of Vibration and Shock
基金
国家自然科学基金项目(51878274)
河南省高等学校青年骨干教师资助计划(2015GGJS-104)
关键词
人-结构竖向相互作用
动力特性
人体姿态
振动频率
模态阻尼比
vertical human-structure interaction
dynamic characteristics
human body posture
vibration frequency
modal damping ratio
