为了在地震波激励下对大跨桥梁结构建立一套振动控制系统评价体系,比较不同控制策略的控制效果,将艾默生纪念桥(Emerson Memorial Bridge)作为斜拉桥振动控制的Benchmark模型,用以研究地震激励下斜拉桥振动控制所采取的各种控制算法和装置的有效性。系统总结十余年来各国学者在该研究中涉及到的各种传统控制算法以及智能算法,阐述了该桥被动控制、主动控制、半主动控制、混合控制的应用情况,对未来的研究趋势进行展望。以艾默生纪念桥为例,选取新型主动EMD阻尼器作为控制装置,实施基于模糊推理的智能控制。将EMD装置的速度作为模糊控制器输入,制定模糊规则,快速、有效地确定EMD装置输出电压,从而对该桥在线实时控制。数值仿真结果表明:18项控制指标接近于样本控制,尤其对基础处剪力、倾覆力矩以及桥塔处拉索的减振控制效果明显。
In order to establish a set of vibration control assessing system for long-span bridge structures under the excitation of earthquakes and compare the effects of different control measures,the Emerson Memorial Bridge is taken as the benchmark model for vibration control of cablestayed bridge,to study the efficiency of all the control calculation methods and devices for vibration control of cable-stayed bridge under earthquake excitation.Various conventional control calculation methods and intelligent calculation methods associated with the studies conducted by scholars from different countries in the past ten-odd years were systematically summarized.The implementation conditions of the passive control,positive control,semi-passive control and hybrid control were set forth,and proposals were given for the future study.The Emerson Memorial Bridge is cited as an example,a new type of EMD dampers were selected as the control devices to carry out the intelligent control based on fuzzy inference.The speed of the EMD dampers were input as the fuzzy control device,and the fuzzy rules were formulated,the output voltage of EMD dampers were rapidly and efficiently determined,so that the online real-time control of the bridge was realized.The results of the numerical simulation demonstrate that 18 control indexes are close to the sample control and especially have distinct effects on the control of shear force and overturning moment at the foundations and vibration damping control effect of the stay cables at the pylons.