【摘要】 采用有限单元法分析了斜拉桥的非线性参数振动问题,验证了在一定的频率范围内斜拉索与桥面板会发生参数共振;提出了应用形状记忆合金(SMA)对斜拉桥的参数振动实施半主动控制,并数值模拟了其控制效果,结果表明,斜拉桥参数振动的SMA半主动控制,不仅能大幅度地降低斜拉索和桥面板的振动,而且能有效地抑制斜拉桥参数共振的发生。更多还原

【Abstract】 The nonlinear parametric vibration analysis of cable-stayed bridges is conducted using finite element method. The parametric resonances between the stay cable and the bridge deck that may occur in a certain frequency domain are identified. The semi-active control using Shape Memory Alloys (SMA) on the parametric vibrations of cable-stayed bridges is performed and the control effect for a cable-stayed bridge is numerically simulated. Results show that, after employing the SMA semi-active control, not only the parametric vibrations of the stay cable and the bridge deck can be significantly reduced, but also the parametric resonances of the cable-stayed bridge can be effectively suppressed.更多还原