人行玻璃悬索桥静动力性能测试分析

Static and Dynamic Performance Test and Analysis of Glass Suspension Footbridge

鉴于人行玻璃悬索桥静动力性能研究不够充分、缺少行业标准的现状,以某景区玻璃悬索桥为工程实例,采用理论计算和现场测试相结合的方法进行桥梁静动力性能分析。静力性能方面测试了主梁的挠度和索塔塔顶纵向位移;动力性能方面测试了桥跨结构的自振频率、振型及振动加速度。分析结果表明:桥跨结构刚度偏弱,其承载力不能满足规范和设计要求,建议对该桥进行加固处理或降低荷载标准使用。人群荷载下,桥梁结构振动明显,舒适度评价结果整体较差,建议增设专门的抗风缆及风拉索,提高桥梁结构整体刚度。

In view of the insufficient research on the static and dynamic performance of glass suspension footbridge and the lack of industry standards,this paper takes a glass suspension footbridge in a scenic spot as an engineering example,and adoptes the method of combining theoretical calculation and field test to analyze the static and dynamic performance of the bridge.In terms of static performance,the deflection of the main beam and the longitudinal displacement of the top of the cable tower were tested.In terms of dynamic performance,the natural frequency,vibration mode and vibration acceleration of the bridge span structure were tested.The analysis results show that the stiffness of the bridge is weak,and its bearing capacity can not satisfy the code and design requirements.It is suggested to strengthen the bridge or reduce the load standard.Under crowd load,the vibration of the bridge structure is obvious,and the comfortable degree evaluation results are poor.It is recommended to add special wind resistant cables and wind stay cables to improve the overall stiffness of the bridge structure.