含电流变体的复合砂浆梁振动特性实验研究

Dynamic performance of cantilever mortar beams with electrorheological fluid filled in a central crack

本文开展了将电流变体智能材料直接埋置在土木工程中常用的砂浆材料中的可行性、具体操作工艺及注意事项的研究。利用电流变体作为驱动元件与基体砂浆材料结合制成智能悬臂梁结构,调节施加在电流变体上的电压,用锤击法测定其在不同电场强度下的自振频率,观察分析频率随电场强度的变化规律。实验结果表明,改变施加在电流变体上的电压确实可以改变复合梁的整体振动特性,尤其是对第一、二阶频率影响比较明显。本文的研究为电流变体在实际工程结构振动控制领域的应用奠定了实验基础。

The paper studies the feasibility and operative technology of the electrorheological (ER) fluid embedded in mortar directly. Moreover, a mortar cantilever with embedded ER fluid was made to investigate the natural vibration frequency through hammering test. The changing rule of frequencies under different electric field intensity was analyzed. The experimental results indicate that the first and second order natural frequencies increase with increasing electric field intensity, however, the third order one is changeless. This research is the experimental basis of the application of ER fluid to the field of vibration control in engineering practice.