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Active control implementation in cable-stayed bridges for quasi-static loading patterns

机译：斜拉桥中准静态载荷模式的主动控制实现

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The following paper deals with active control implementation in cable-stayed bridges. Recent developments in structural active control of cable-stayed bridges are focused on the adaptability to dynamic effects produced by earthquakes or extreme winds (El Ouni et al., 2012; Pakos and Wojcicki, 2014; Domaneschi et al., 2015a,b). Nevertheless, no attention has been paid to the static or quasi-static case. As stated by Housner et al. (1996), Song et al. (2006) or Gilewski and Al Sabouni-Zawadzka (2015), active control could also be useful to diminish fatigue in the day-to-day performance of this type of bridges by decreasing stresses adaptively. Indeed, the following paper shows that excitation periods produced by traffic loads and natural periods of vibration of this type of bridges are sufficiently distant one another so as to conclude that a quasi-static analysis can be performed. Filling this gap, the following paper proposes a structural analysis procedure to include active control systems in the design process of cable stayed bridges, as well as suggestions which ought to be considered in order to include these cases into codes. The results of the paper, studying both non-cumulative and cumulative load cases, show a reduction in unbalanced bending moment referred to the Neutral Moment State of around 25%, depending on the load case. As a result, active control systems compensating quasi-static loading patterns can certainly help engineers optimise the design of these emblematic structures. (C) 2016 Elsevier Ltd. All rights reserved.
机译：以下文章讨论斜拉桥中的主动控制实现。斜拉桥结构主动控制的最新进展集中在对地震或强风产生的动力效应的适应性上（El Ouni等，2012; Pakos和Wojcicki，2014; Domaneschi等，2015a，b）。然而，没有关注静态或准静态情况。如Housner等人所述。 （1996），Song等。 （2006）或Gilewski和Al Sabouni-Zawadzka（2015），主动控制也可以通过自适应降低应力来减轻此类桥梁的日常性能疲劳。的确，以下论文表明，这种类型的桥梁的交通荷载和自然振动周期所产生的激励周期彼此相距足够远，从而得出可以进行准静态分析的结论。为填补这一空白，以下论文提出了一种结构分析程序，在斜拉桥的设计过程中将主动控制系统包括在内，并提出了将这些情况纳入法规的建议。该论文的结果对非累积和累积载荷工况进行了研究，结果表明，根据载荷工况，相对于中性力矩状态的不平衡弯矩减小了约25％。结果，补偿准静态载荷模式的主动控制系统无疑可以帮助工程师优化这些标志性结构的设计。 （C）2016 Elsevier Ltd.保留所有权利。

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