结构损伤对结构侧向振动影响的试验研究

Experimental Study of Side Direction Dynamic Response Affected by Structural Damage

结构的损伤改变结构的动力特性及动力响应。为保障结构的安全运营需深入了解结构的动力响应情况。用试验的方法研究了结构损伤与结构动力响应的关系。针对三维框架结构,用结构中立柱上的不同深度裂缝模拟结构损伤。测试了正弦扫频激励时结构损伤对结构振动的影响。试验结果表明结构正向振动的最大响应值随着结构损伤的增大而减小。结构侧向振动有相反的规律,其最大振动响应值随着结构损伤的增大而增大。在结构损伤程度较大时,损伤对结构侧向振动的影响远远大于对正向振动的影响。

Damage in a structure alters its dynamic characteristics and vibration response. Maintaining safety and integrity of the structures due to the catastrophic failure of undetected damage structures requires a better understanding of structural dynamic response. In this study, the relationship between structural damage and dynamic response is investigated. As a demonstration, the experiment of a three-- dimensional steel frame structure with different damage is validated. The structural damage in the frame structure is simulated by saw--cutting a crack with the different depths across the whole width in the pillar of the structure. The sweep--sine resonance test is applied to study the relationship between structural damage and dynamic response. The experimental results indicate that structural resonance response of exciting direction decreases when structural damage increases, but structural resonance response of side direction increases. Effect on structural resonance response of side direction by structural damage is greeter than that of structural resonance response of exciting direction.