摘要
轻质人行桥与桥上的静态人体、行人之间均会产生明显的竖向耦合作用。为进一步明确人-桥竖向耦合振动效应,基于室内简支钢结构-玻璃轻型人行桥模型试验平台,分别开展了静立单人-桥、行走单人-桥以及静立单人-行走单人-桥竖向耦合振动效应试验研究。试验结果表明:静立人体作用导致人行桥竖向自振频率降低,而行人使得人行桥竖向自振频率增大;行人步频对人-桥耦合系统的竖向自振频率影响较小,但行人步频及其谐波分量与耦合系统竖向自振频率的接近程度对人行桥加速度响应频谱卓越频率影响较大;当人行桥上同时存在静立人体和行人时,静立人体作为人行桥振动的实际感知者,其驻留位置处人行桥的竖向加速度明显小于自身实际加速度。研究成果可为人-桥竖向相互作用以及人行桥振动舒适度评估提供参考。
There is an obvious vertical coupling between a light foot bridge and a static human body or a pedestrian on it.Here,to further clarify human-bridge vertically coupled vibration effects,based on the indoor model test platform of simply supported steel structure-glass light foot bridge,vertically coupled vibration effects of single standing person-bridge,single pedestrian-bridge and single standing person-single pedestrian-bridge were studied with tests,respectively.The test results showed that vertical natural vibration frequencies of a foot bridge decrease due to the action of standing human body,while a pedestrian can increase those frequencies;pedestrian step frequency has a smaller influence on vertical natural frequencies of the human-bridge coupled system,but the proximity of pedestrian step frequency and its harmonic components to vertical natural frequencies of the human-bridge coupled system has a larger influence on predominant frequencies in the acceleration response spectrum of the human-bridge coupled system;when there are both a standing human body and a pedestrian on a foot bridge,the standing person is taken as the actual perceiver of bridge vibration,the bridge vertical vibration acceleration at his stay position is obviously smaller than his own actual acceleration;the study results can provide a reference for human-bridge vertical interaction and evaluating vibration comfort of foot bridges.
作者
温金龙
汪志昊
寇琛
霍洪媛
WEN Jinlong;WANG Zhihao;KOU Chen;HUO Hongyuan(School of Civil Engineering and Communication,North China University of Water Resources and Electric Power,Zhengzhou 450045,China;The First Company of China Eighth Engineering Division Ltd.,Jinan 250100,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2022年第9期26-31,50,共7页
Journal of Vibration and Shock
基金
国家自然科学基金(51878274)
河南省高等学校青年骨干教师资助计划(2015GGJS-104)。
关键词
人-桥竖向相互作用
静立人体
行人
动力特性
振动舒适度
human-bridge vertical interaction
standing human body
pedestrian
dynamic characteristics
vibration comfort
