摘要
合肥金大地1912项目跨怀宁路人行桥为(10.8+50.8+9.0)m钢结构桥梁,建立空间有限元模型,对该桥动力特性及共振响应进行分析,结果显示在人正常行走步频下该桥容易产生共振,需设计安装TMD提高人行桥阻尼。对TMD主要设计参数进行优化设计,得到弹簧刚度、阻尼系数等设计参数。参考Matsumoto公式、高密度人群公式设置多种激振工况,对安装TMD后的人行桥进行动力测试,根据实测数据对TMD的弹簧刚度进行调节。TMD安装前、后人行桥的动力响应对比结果表明,设计的TMD参数合理,在发生共振的情况下人行桥的减振率达61.33%,减振效果良好。
The footbridge crossing the Huaining Road, which is part of the Jindadi 1912 pro- ject in Hefei city, is a （10.8＋50.8＋9.0） m steel bridge. The spatial finite element model of the bridge was established to analyze the dynamic property and resonance response of the bridge. The results of the analysis indicate that the bridge is susceptible to resonance under the normal step fre- quency in human walking. Therefore, it is necessary to improve the damping performance of the footbridge via installing tuned mass dampers. By optimizing the main design parameters of the TMDs, the design parameters like spring stiffness and damping ratio were gained. Multiple hu- man induced vibration conditions were created based on the Matsumoto formula and high-density crowd flow formula to test the dynamic property of the footbridge before and after the TMDs were installed. Besides, the spring stiffness of the TMDs was adjusted according to the measured data. The results of the comparison of the dynamic response of the footbridge before and after the TMDs were installed show that the parameters designed for the TMDs are rational, when the resonance occurs, the damping ratio of the footbridge could reach up to 61.33%, the damping effect is good.
出处
《世界桥梁》
北大核心
2013年第6期6-10,共5页
World Bridges
关键词
人行桥
TMD
消能减振
动力响应
设计
检测
footbridge
TMD
energy dissipation and vibration damping
dynamic response
design
inspection
