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Experimental test of asymmetrical cable-stayed bridges using MR-damper for vibration control

机译：非对称斜拉桥用MR阻尼器进行振动控制的实验测试

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摘要

In this paper, a semi-active control by MR-damper is researched; its purpose is to effectively control vibration of asymmetrical cable-stayed bridges when earthquake is loaded on the type of bridge. For an experimental study, a model of 10.2 m high and 28 m long asymmetrical cable-stayed bridge structure was built being similar to a real one in size and function. A MR damper was also designed in proper size suitable for the control of the model. The experiment was performed in the way in which three piers were fixed on three shaking tables with 30% of El-centro earthquake wave, and a control device was placed on the lower part of its upper deck for horizontal control. As for control algorithms, Lyapunov and Clipped-optimal control algorithms were applied. The effectiveness of the semi-active control with MR damper for the asymmetrical cable-stayed bridge was measured under five control conditions: Un-control, Passive-off, Passive-on, Lyapunov Control, Clipped-optimal Control. The experiment showed that the semi-active control applying Lyapunov and Clipped-optimal algorithms effectively increased controllability almost in double, and decreased displacement 75% compared with the condition of passive-off. Therefore the semi-active method suggested in this paper is proven effective in controlling asymmetrical cable-stayed bridges.
机译：本文研究了MR阻尼器的半主动控制。其目的是有效地控制非对称斜拉桥在地震作用下的振动。为了进行实验研究，建立了一个高度为10.2 m，长度为28 m的非对称斜拉桥结构的模型，该模型在大小和功能上均类似于真实的桥梁。 MR阻尼器还设计为适合模型控制的适当尺寸。实验是这样进行的：将三个墩固定在三个装有30％El-centro地震波的振动台上，并将控制装置放置在其上甲板的下部以进行水平控制。至于控制算法，应用了Lyapunov和限幅最优控制算法。在以下五个控制条件下测量了带有MR阻尼器的半主动控制对不对称斜拉桥的有效性：非控制，被动关闭，被动开启，Lyapunov控制，最佳剪裁控制。实验表明，与被动关闭相比，采用Lyapunov和Clipped-optimum算法的半主动控制几乎可以成倍地提高可控制性，并减少75％的位移。因此，本文提出的半主动方法被证明可有效地控制非对称斜拉桥。

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