摘要
以某空间曲梁景观步行桥为例,介绍人行桥人致激励振动分析方法及减振设计方案。首先阐述了人行荷载产生的机理和简化力学模型,给出了人行桥振动舒适性评价指标;其次利用有限元软件,模拟了该景观步行桥在不同人行荷载工况下的人致振动响应,并根据舒适性评价指标进行人行桥舒适性评估;最后根据评估结果并考虑到实际结构的不确定性以及该桥的重要性,对该桥进行基于调频质量阻尼器(TMD)的减振预案设计。计算结果表明,经过减振设计之后,该桥主梁的加速度峰值大幅下降,将不会出现超过人行舒适性的人致振动。
Taking a spatial curved beam landscape footbridge as an example,this paper introduces the human-induced vibration analysis method and the vibration reduction design scheme of footbridge.This paper firstly sets forth the mechanism of pedestrian load generation and the simplified mechanical model,proposes the vibration comfort evaluation indexes of footbridge,then simulates the human-induced vibration responses of this landscape footbridge under the different pedestrian load conditions by using the finite element software,and evaluates the comfort of this footbridge according to the comfort evaluation indexes.Finally,based on the evaluation results and considering the uncertainty of the actual structure and the importance of the bridge,a vibration reduction scheme based on the tuned mass damper(TMD)is designed for this footbridge.The result shows that the acceleration peak of the main beam of this footbridge is greatly reduced after the vibration reduction design is applied,and no human-induced vibration will occur beyond the comfort of the pedestrian.
作者
蒋长江
梁俊松
Jiang Changjiang;Liang Junsong
出处
《城市道桥与防洪》
2019年第8期76-80,M0011,共6页
Urban Roads Bridges & Flood Control
关键词
步行桥
人致振动
舒适性评估
减振设计
footbridge
human-induced vibration
comfort evaluation
vibration reduction design
作者简介
蒋长江(1987-),男,硕士,工程师,从事桥梁设计和工程总承包工作。
