多变空间连续桁架人行景观桥振动控制研究

Research on Vibration Control of Pedestrian Landscape Bridge with Variable Spatial Continuous Truss

为实现建筑造型,对人行桥采用了复杂的空间桁架结构。该结构在各向的刚度较小,自振频率与人行敏感频率接近可能诱发结构出现过大振动,故采取阻尼器振动控制措施。以海口市龙昆南路上一座具有“飞鱼”形态的人行景观桥为例,介绍了对原始结构的动力特性分析、阻尼器布置方案设计、结构减震效果分析、阻尼器参数及适应性分析,并经过理论研究和实际应用,桥梁减震效果达到预定目标。

To realize the architectural modeling,the complex spatial truss structure is adopted in the construction of pedestrian bridge.The stiffness in all directions of the structure is smaller.Its natural frequency is close to the pedestrian sensitivity frequency,which may induce provoke the large vibration of the structure.Therefore,the damper vibration controls measures are taken.Taking a"flying-fish-shaped"pedestrian landscape bridge on South Longkun Road in Haikou as an example,the analysis on the dynamic characteristics of the original structures,the design of damper layout scheme,the analysis on the damping effect of structure,and the analysis on parameters and adaptation of damper are introduced.By theoretical research and practical applications,the damping effects of bridge reach the target.