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建立了曲线桥有限元模型,对桥梁施加半主动控制装置进行减震,研究了多维多点地震激励以及地震输入的不同角度对结构减震效果的影响规律。结果表明:采用半主动Hrovat控制算法,可以很好的追踪主动控制效果,有效地控制曲线桥在地震激励下的响应。多维多点地震激励对结构的减震效果影响显著,可以显著降低桥梁的预期减震率。此外,激励角度和多点激励效应是相互耦合的,建议在确定半主动控制系统的参数时,应考虑多维多点地震激励的影响,并在激励角度沿着曲线桥弦向方向输入时进行设计,以保证结构的控震效果。该文的研究为半主动控制用于曲线桥提供了理论依据。
The finite element model of curved bridge is established, and the semi-active control device is applied to the bridge to reduce the vibration. The influences of multi-dimensional and multi-point seismic excitation and seismic input on the damping effect are studied. The results show that the semi-active Hrovat control algorithm can track the active control effectively and control the response of the curved bridge under seismic excitation effectively. Multi-dimensional multi-point seismic excitation has a significant effect on the damping effect of the structure, which can significantly reduce the expected damping rate of the bridge. In addition, the excitation angle and the multi-point excitation effect are coupled with each other. It is suggested that the influence of multi-dimensional multi-point seismic excitation should be considered when determining the parameters of the semi-active control system, and the design should be performed when the excitation angle is input along the chord direction of the curve bridge , To ensure that the structure of the earthquake control effect. The research in this paper provides a theoretical basis for semi-active control of curved bridges.