形状记忆合金阻尼器在减小桥梁拉索振幅方面的应用研究

发布时间：2018-07-01 11:36

本文选题：斜拉索 + 振动控制　；参考：《世界桥梁》2017年02期

【摘要】：为减少因风、雨或交通荷载引起的过大振幅导致桥梁拉索损伤和破坏的危险,进行了应用镍钛(NiTi)形状记忆合金(SMA)阻尼器减小拉索振幅的研究。为定性定量地评定SMA阻尼器减小桥梁拉索振幅的效率,在法国南特的Ifsttar实验室进行拉索足尺模型试验。分有、无阻尼器2种工况,在拉索中部激起强烈振动进行实测。测量结果表明,SMA阻尼器能够有效地减少振动时间和振幅,有阻尼器时,拉索的振动仅在10s后即停止,振幅减小到原来的1/4;无阻尼器时,拉索在120s后仍然振动。同时分析了阻尼器的位置对SMA阻尼器效应的影响,当阻尼器位于最大振幅附近时,即通常在施力点附近时,阻尼效应更好。采用Marc、Mentat程序进行有限元分析,计算结果与实测结果吻合良好。
[Abstract]:In order to reduce the risk of bridge cable damage and damage caused by excessive amplitude caused by wind, rain or traffic load, the application of Niti shape memory alloy (SMA) damper to reduce cable amplitude was studied. In order to evaluate qualitatively and quantitatively the efficiency of SMA damper in reducing the amplitude of bridge cables, a full-scale model test of cables was carried out at the Ifsttar laboratory in Nantes, France. There are two working conditions without dampers, which arouse strong vibration in the middle of the cable to be measured. The measurement results show that the SMA damper can effectively reduce the vibration time and amplitude. In the presence of the damper, the vibration of the cable stops only after 10 seconds, and the amplitude decreases to 1 / 4 of the original amplitude, and the cable still vibrates after 120 seconds without the damper. At the same time, the influence of the damper position on the SMA damper effect is analyzed. When the damper is located near the maximum amplitude, that is, usually near the force point, the damping effect is better. The finite element analysis is carried out by using Marc Mentat program, and the calculated results are in good agreement with the measured results.
【作者单位】：郑州大学土木工程学院;西南交通大学土木工程学院;
【分类号】：U441.3

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