强震作用下渡槽TLD 效应模型试验研究

通过对矩形截面渡槽的单跨模型进行动力试验研究,探讨了渡槽在刚性地基强震条件下的调谐液体阻尼器(TLD)效应；通过调节槽内水位,研究了水体横向减震作用与深宽比的关系。试验结果表明,水体的晃动及水波破碎对渡槽的横向动力响应起到了 TLD 减震作用。渡槽内水位增加会改变结构的动力特性,使渡槽结构自振频率下降。在强震作用下,TLD 横向减震效果随水位变化发生波动,当槽内水体晃动频率与渡槽结构自振频率接近时,减震作用最为显著。

Model test of TLD effect on aqueduct structure subjected to strong vibration

Based on tests of a rectangular one-span simply supported aqueduct, the tuned liquid damper (TLD)effect on the aqueduct under the condition of a rigid foundation subjected to strong vibration was analyzed. Therelationship between the transverse damping effect and the ratio of depth to width were studied by adjusting thewater level. The test results demonstrated that water sloshing and wave breaking had a TLD effect on the aqueductstructure; the increase of the water level in the aqueduct changed the dynamic properties of the structure, causingthe self-vibration frequency of the structure to decrease; during strong vibration, the TLD effect fluctuated with thechange of water level; and the most significant TLD effect occurred when the water sloshing frequency was close tothe self-vibration frequency of the structure.