人行桥人行激励振动及设计方法

对人行桥人行激励竖向振动的国内外现有规范和标准进行了比较研究 ,并探讨了针对侧向人行激振的振动使用性设计方法 .建议人行桥梁设计时应首先采用频率调整法 ,使结构自振频率尽量不落在敏感频率范围内 .不能达到频率要求时 ,再进一步采用动力响应法分析 .在参考国外规范的基础上 ,建议确定竖向和侧向人行激振荷载的计算公式 .该公式考虑了高阶分量的影响 ,还对人行桥振动舒适度标准进行了比较 ,认为参用英国规范的标准较为合理 .

Human Walking Induced Footbridge Vibration and Its Serviceability Design

The paper compared the design codes for vertical vibration serviceability of footbridge induced by human walking,and also investigated the lateral vibration of footbridge.As a design method,frequency tuning approach (FTA) was suggested to be used first to avoid critical frequency ranges.If it could not be satisfied,the vibration serviceability should be evaluated by a dynamic response analysis approach (DRAA).Based on the discussions on design codes of oversea,the formulas determining the pedestrian forces in vertical and lateral directions for DRAA were proposed,in which the second harmonic of the load was taken into account.Moreover acceptability limits of response acceleration for vibration serviceability was discussed and the criterion of acceptability given by U K code (BSI1978) was shown as a suitable one.