磁流变阻尼器减振结构振动台试验与动力可靠性分析

发布时间：2018-05-18 21:37

本文选题：随机地震动 + 振动台试验　；参考：《湖南大学学报(自然科学版)》2017年07期

【摘要】：为研究随机激励作用时磁流变阻尼器在结构中的实际减振效果以及对结构动力可靠度的影响,开展了随机地震动作用下磁流变阻尼器减振结构振动台试验,并采用等价极值事件原理和概率密度演化方法,对有控和无控模型结构的动力可靠度分别进行了分析.结构控制振动台试验中,采用基于物理随机地震动模型生成的地震动样本作为台面输入.试验及分析结果表明,磁流变阻尼器能够显著降低模型结构层间位移反应的均值和标准差,同时,大多数楼层的绝对加速度反应亦取得了一定的减振效果;随机地震动作用下,模型结构动力响应的变异性显著,并且不同试验地震动样本作为台面输入时,磁流变阻尼器取得的减振效果不同;采用磁流变阻尼器作为减振装置,能够显著提高模型结构各楼层可靠度以及体系可靠度.
[Abstract]:In order to study the effect of magnetorheological damper (MRD) on structural vibration reduction under random excitation and its influence on structural dynamic reliability, a vibration table test of Mr damper under random ground motion was carried out. Using the equivalent extreme event principle and the probability density evolution method, the dynamic reliability of controlled and uncontrolled model structures is analyzed respectively. In the structural control shaking table test, the ground motion samples based on the physical random ground motion model are used as the table input. The experimental and analytical results show that the magnetorheological damper can significantly reduce the mean value and standard deviation of the displacement response between the layers of the model structure, and at the same time, the absolute acceleration response of most floors can also achieve a certain damping effect under the action of random ground motion. The dynamic response of the model structure is highly variable, and the effect of Mr damper is different when different test ground motion samples are used as table input, and the magnetorheological damper is used as damping device. The reliability of each floor of the model structure and the reliability of the system can be improved significantly.
【作者单位】：华侨大学土木工程学院;
【基金】：国家自然科学基金资助项目(51608212) 福建省自然科学基金资助项目(2015J01211)~~
【分类号】：TU352.1

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