Tests for effects of human body posture on vertical dynamic characteristics of a human-structure interaction system
WANG Zhihao， KOU Chen， LIU Zhaopeng， LI Xiaoke
International Joint Research Lab for Eco-building Materials and Engineering of Henan Province,North China University of Water Resources and Electric Power, Zhengzhou 450045, China
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.
汪志昊，寇琛，刘召朋，李晓克. 人体姿态对人-结构耦合系统竖向动力特性影响试验研究[J]. 振动与冲击, 2019, 38(19): 58-63.
WANG Zhihao， KOU Chen， LIU Zhaopeng， LI Xiaoke. Tests for effects of human body posture on vertical dynamic characteristics of a human-structure interaction system. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(19): 58-63.
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