【摘要】 在人群荷载激励作用下,大跨钢楼盖极易产生影响正常使用的振动。采用两种不同的人群荷载模型,考虑不同人员密度、不同步行频率情况,计算分析了某火车站高架候车大厅大跨度钢结构楼盖在人群步行荷载激励下的振动情况并进行了振动控制。计算结果表明在楼盖指定钢梁跨中安置TMD-粘滞流体阻尼器消能减振装置后,有效地削减了该楼盖的振动响应。采用人群全部同步模型时,所有工况下平均减振率为16.86%,在共振工况下减振率达38%以上;采用步频服从正态分布模型时,不同人群密度条件下减振率在15.50%～15.80%之间,验证了步频服从正态分布模型具有一定的准确性,为实际工程设计提供了理论依据。更多还原

【Abstract】 Large-span steel plates will produce vibration to affect the normal use under crowd load excitation.The vibration condition of large span steel structure floor of a railway station is analyzed under the crowd load.Tuned mass damper(TMD) system and fluid viscous dampers are installed in the middle span of steel beam located.The crowd load considers different person densities,different walking frequencies.Dynamical analysis and results prove that the vibration energy dissipation can effectively reduce the resonance response of the large-span floor structure.The mean ratio of vibration reduction rate comes up to 16.86% of all cases,and the reduction rate of resonance case exceeds 38% with crowd all synchronous model.The reduction rates are 15.50% to 15.80% at different density conditions with walk frequencies normal distribution model.This verifies the correctness of the load simulation method of walk frequency normal distribution model and provide theory basis for practical engineering design.更多还原