某人行架空栈桥侧向舒适度及其控制措施

Lateral Comfort Level and Control Measures of Pedestrian Overhead Trestle

对比分析了独柱墩连续刚构人行架空栈桥不同墩高、不同桥墩直径条件下桥梁结构的应力、挠度、竖向频率和侧向频率,结果表明:结构应力、挠度和竖向频率较容易满足规范限值要求,对于国内相关规范未作规定的侧向频率和侧向舒适度限值是这类桥梁设计的控制因素。在桥面上行人交通荷载繁忙的不利状况下,为保证结构轻柔,采用较小的桥墩直径,设置侧向调谐质量阻尼器(TMD),在桥梁侧向频率无法避开行人横桥向步行频率的情况下,能保证结构的侧向舒适度要求。

The stress,deflection,vertical frequency and lateral frequency of the single-pier continuous rigid-frame pedestrian overhead trestle under the different pier heights and different pier diameter are compared and analyzed.The analysis results show that the stress,deflection and lateral frequency of the structure are easy to meet the limiting values of standard.The lateral frequency and lateral comfort level limits not specified in the relevant domestic specifications are the control factors in the design of this kind of bridge.Under the unfavorable condition of heavy pedestrian traffic load on the bridge deck,in order to ensure the gentle structure,a smaller pier diameter is adopted,and the lateral tuning mass damper(TMD)is set.In the case that the lateral frequency of the bridge cannot avoid the pedestrian transverse bridge walking frequency,the lateral comfort requirements of the structure can be guaranteed.