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某40m跨室内钢结构人行桥采用张弦结构,在使用荷载下结构的1阶竖向自振频率为1.78Hz,不满足我国《城市人行天桥与人行地道技术规范》中不小于3.0Hz的要求;在高密度人群荷载下桥的最大竖向加速度为2.23m/s2,根据EN03(2007)中关于行人舒适度的定义,属于“CL3级,不舒适”范围。针对以上问题,本文设计采取悬挂调制质量阻尼器(TMD)方式对人行桥进行减振设计与舒适度控制,取得了明显效果。
A 40m-span indoor steel structure footbridge adopts a string structure. The first-order vertical natural frequency of the structure under the service load is 1.78Hz, which does not meet the requirements of not less than 3.0Hz in China’s Urban Footbridge and Pedestrian Airstrips ; The maximum vertical acceleration of the bridge under high-density crowd loading is 2.23 m / s2, which falls within the category “CL3, uncomfortable” according to the definition of pedestrian comfort in EN03 (2007). In view of the above problems, this paper designed to adopt suspension modulation mass damper (TMD) on the footbridge damping design and comfort control, and achieved significant results.