大跨径拱桥被动减震控制的仿真分析

Seismic simulation of passive energy dissipation arch bridge

本文采用现代控制理论对设有耗能减震装置的拱桥结构进行被动减震控制仿真分析,给出了大跨度拱桥在多点激励下的运动微分方程,将拱桥简化成平面杆系模型,给出减震结构的状态方程,然后基于SIMULINK环境下对设有粘滞阻尼器的拱桥减震结构进行动态仿真分析,并考虑了行波效应对减震效果的影响。该方法较之传统的分析方法更简便、有效,分析结果表明设置了耗能器的拱桥结构地震反应有明显的降低。

In this paper, the passive energy dissipation arch bridge is analyzed in terms of modem control theory. The dynamic differential equation of long-span arch bridge subjected to multi-support seismic excitation is presented and the arch bridge is simplified as an two-dimensional bar-system model, and then the state equation of passive control structure is derived. According to the equation , seismic simulation of arch bridge with viscous dampers is carried out through the SIMULINK toolbox in MATLAB and traveling wave effects on the responses of structure are considered. The method is more simple and efficient than the conventional methods, and the results demonstrate that the responses of arch bridge are decreased with the addition of energy dissipation system.