Design and Construction of a Very Lively Bridge
Design and Construction of a Very Lively Bridge
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DOI：
10.1007/978-1-4614-6555-3_41
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
S. Z̆ivanović;R. P. Johnson;H. Dang;J. Dobrić
中科院分区：
文献类型：
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作者：
S. Z̆ivanović;R. P. Johnson;H. Dang;J. Dobrić
近年来，越来越多的轻型结构被报道在行人诱导的动力荷载作用下表现出显著的竖向振动。人们认为，行人通过改变他们的行走方式和改变振动系统的动态特性来与活跃的结构相互作用。由于现有的振动舒适性准则没有考虑这些人-结构相互作用的影响，它们不能准确地预测结构的动力响应。目前对行人-结构相互作用的基本了解是有限的，因为大多数报道都是定性的。为了提高人们对人与活体结构相互作用的认识和建立模型，需要一种可以由人类行走激发的专门建造的实验装置。在英国华威大学结构实验室有限的空间内设计一座相对较重和低频的人行天桥的挑战，通过采用传统的钢-混凝土组合结构体系来解决。给出了在“沃里克大桥”上收集的前六个月结构寿命的实验数据，以描述其静态和动态行为。动力试验表明，该桥的基本自振频率为2.4 Hz，相应的阻尼比为0.5%，并有机会根据需要调整动力特性，成功地满足了关键设计标准。
In recent years, an increasing number of light structures has been reported to exhibit substantial vertical vibrations when exposed to pedestrian-induced dynamic loading. It is believed that pedestrians interact with lively structures by altering their walking style and changing the dynamic properties of the vibrating system. As the existing vibration serviceability guidelines do not address these pedestrian-structure interaction effects, they cannot predict the structural dynamic response accurately. Fundamental understanding of the pedestrian-structure interaction is currently limited since most reported observations are of qualitative nature. To improve understanding and develop models of human interaction with lively structures, a purpose-built experimental facility that can be excited by human walking is required.This paper describes design and construction of a 19.9 m long, low-frequency and lightly damped experimental bridge for studying pedestrian-structure interaction. The challenge to design a relatively heavy and low-frequency footbridge in the limited space of the Structures Laboratory at the University of Warwick, UK, was met by adopting a traditional steel-concrete composite structural system. The experimental data collected on the "Warwick Bridge" during first six-months of structural life are presented to characterise both its static and dynamic behaviour. Dynamic testing of the bridge revealed that, with an achieved fundamental natural frequency of 2.4 Hz, the corresponding damping ratio of 0.5%, and an opportunity to tune the dynamic properties as required, the key design criteria were successfully met.