锚杆对溢流面板坝流激振动特性影响的研究
发布时间：2018-10-20 11:28
【摘要】：针对设锚杆的溢流面板坝泄槽流激振动性能复杂的特征,基于ABAQUS软件建立拟三维仿真模型,通过MATLAB自编程序实现脉动压强时域激励荷载的构造,采用时域分析法对不同泄流条件下设锚杆的系统模态和流激振动性能进行研究。结果表明:在水流流激振动作用下,锚杆对溢流面板坝泄槽动力稳定性的影响主要体现于泄槽中不同的流速条件,当泄槽最大流速大于40 m/s时,设锚杆使系统基频降低速率明显变缓,使泄槽底板接缝处发生较大变形和关键部位产生过大拉应力的流速明显增大,提高了其结构在水流流激振动作用下的动力稳定性。
[Abstract]:In view of the complex characteristics of flow induced vibration of overflow concrete face rockfill dam with anchors, a pseudo-3D simulation model is established based on ABAQUS software, and the time-domain excitation load of pulsating pressure is constructed by MATLAB program. Time domain analysis method is used to study the system modal and fluid-induced vibration performance of anchors under different discharge conditions. The results show that under the action of flow induced vibration, the effect of anchor rod on the dynamic stability of overflow slab dam is mainly reflected in the different flow velocity conditions, when the maximum flow velocity is more than 40 m / s. The reduction rate of the basic frequency of the system is obviously slowed down by the anchor rod, which causes the large deformation at the joint of the bottom plate of the drain slot and the increase of the velocity of the excessive tensile stress at the key position, which improves the dynamic stability of the structure under the action of the fluid-induced vibration of the water flow.
【作者单位】： 新疆农业大学水利与土木工程学院;河海大学岩土工程研究所;
【分类号】：TV652.1
本文编号：2283026
[Abstract]:In view of the complex characteristics of flow induced vibration of overflow concrete face rockfill dam with anchors, a pseudo-3D simulation model is established based on ABAQUS software, and the time-domain excitation load of pulsating pressure is constructed by MATLAB program. Time domain analysis method is used to study the system modal and fluid-induced vibration performance of anchors under different discharge conditions. The results show that under the action of flow induced vibration, the effect of anchor rod on the dynamic stability of overflow slab dam is mainly reflected in the different flow velocity conditions, when the maximum flow velocity is more than 40 m / s. The reduction rate of the basic frequency of the system is obviously slowed down by the anchor rod, which causes the large deformation at the joint of the bottom plate of the drain slot and the increase of the velocity of the excessive tensile stress at the key position, which improves the dynamic stability of the structure under the action of the fluid-induced vibration of the water flow.
【作者单位】： 新疆农业大学水利与土木工程学院;河海大学岩土工程研究所;
【分类号】：TV652.1
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