曲线桥多维多点地震激励半主动控制分析

SEMI-ACTIVE CONTROL OF CURVED BRIDGE UNDER MULTI-COMPONENT AND MULTI-SUPPORT EARTHQUAKE

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 beam bridge is established, and semi-active control devices are applied. The influence of multi-component and multi-support ground motion and earthquake excitation angle on vibration mitigation rate is analyzed. The results indicate that the mitigation rate of semi-active limit Hrovat control algorithm approaches with the active LQR method, and semi-active dampers are effective in reducing the bridge response. However, the rate can be decreased by multi-component and multi-support effect of earthquake, and the effect of excitation angle and multi-support excitation are coupled. It is recommended that in the design of semi-active control system, multi-component and multi-support effect should be taken into account with excitation angle along with the chord axis of the bridge in order to guarantee the control effect. The research provides theoretical basis of curved bridge using semi-active devices.