Some relevant aspects of footbridge vibrations
Some relevant aspects of footbridge vibrations
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人行天桥振动的一些相关方面
DOI：
10.2298/fuace0204281s
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
Novak Spasojevic
中科院分区：
文献类型：
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作者：
Ana Spasojević;Djordje Djordjevic;M. Spasojevic;Novak Spasojevic
考虑到当代结构材料的抵抗力越来越强，具有更高的强度重量比，以及人行桥的活荷载较低的事实，仅基于静态分析的设计，考虑到极限状态要求，导致人行道和自行车道使用的细长桥梁结构。因此，刚度和质量降低，面对活泼，易于激发的结构，具有较小的自然频率。行人对人行桥的激励可能会使在桥上行走或站立的人感到不快，但通常不会对结构本身造成破坏。最近关于细长人行桥动力特性的经验特别表明，振动正常使用极限状态是任何结构设计中非常重要的要求。我们提出了一个通用的算法分析测试的结构动力参数，计算挠度，从而速度和加速度的上部结构在人为激励下，预测欧洲规范，英国和加拿大的标准在使用中，因为没有南斯拉夫的代码处理的问题。评价体系为混凝土简支梁体系中的人行桥。所提出的模型是用来显示对应的结果，得到的算法，与使用简化的方法所建议的实践守则，因为后者只存在于某些结构系统的结果。
Considering the contemporary structural inaterials that are becoming more resistant, having higher strength to weight ratio, and the fact that live load of footbridges is low, the design based on static analysis only, respecting ultimate limit states requirements, leads to slender bridge structures for pedestrian and cycle track use. As a consequence, stiffness and masses decrease, facing lively, easy to excite structures, with smaller natural frequencies. The excitation of a footbridge by a pedestrian passing over it can be unpleasant for a person walking or standing on the bridge, but usually not destructive for the structure itself. Recent experiences regarding dynamic behavior of slender footbridges have especially shown that vibration serviceability limit states are very important requirements in any structural design. We are presenting a general algorithm for analytical testing of dynamic parameters of structures, calculation of deflection, thus speed and acceleration of superstructure under human-induced excitation, as predicted by Eurocode, British and Canadian standards in use, since no Yugoslav code deals with the problem. The evaluated system is a footbridge in a system of a simply supported concrete girder. The presented model is used to show correspondence of results, obtained by the algorithm, with the results obtained using the simplified methods suggested by the Codes of Practice, since the latter exists only for certain structural systems.