大跨人行桥振动舒适度实测及减振效果调试研究

Research on Vibration Comfort Measurement and Vibration Damping Effect Debugging of Large-span Footbridge

大跨轻柔的人行景观桥在设计阶段对其布置TMD进行减振设计,但由于设计阶段和成桥后的结构特性可能因为某些不确定性的因素,导致减振装置参数与结构实际自振特性存在偏差,导致按照设计阶段的参数生产出的减振装置对结构的减振效果不够显著。本研究对大跨人行景观桥建成后进行人致振动舒适度实测,通过锁死和打开减振装置(TMD),分别测试结构的振动响应,对比减振装置的减振效率,若不能满足结构舒适性设计要求,现场通过调试减振装置,优化参数以达到最优减振效果。结果表明,本研究实现了结构从设计到使用全过程跟踪减振控制,提出了一种更为简单合理且行之有效的大跨人行景观桥振动舒适度实测及减振效果调试方法。

The large-span gentle pedestrian landscape bridge is arranged with TMD for vibration damping design at the design stage,but due to the structural characteristics at the design stage and after the completion of the bridge may be due to certain uncertainties,resulting in the deviation of the damping device parameters from the structure's actual self-oscillating characteristics,which leads to the damping effect of the damping device produced in accordance with the parameters at the design stage is not significant enough to dampen the structure.In this study,the human-caused vibration comfort was measured after the completion of the large-span pedestrian bridge.The vibration response of the structure was tested by locking and opening the vibration-damping device(TMD),and the vibration-damping efficiency of the damping device was compared,and the vibration-damping device was debugged on site to optimise the parameters in order to achieve optimal vibration-damping effect if the design requirements of the structural comfort could not be met.The results show that this study realises the whole process of tracking vibration control from design to use of the structure,and puts forward a simpler,more reasonable and effective method of vibration comfort measurement and vibration damping debugging for large-span pedestrian landscape bridges.