广州白云站高架层组合楼盖人致振动及车致振动舒适度研究

Study on vibration serviceability of elevated composite floor of Guangzhou Baiyun Railway Station under pedestrian⁃induced excitation and train⁃induced excitation

广州白云站铁路站房高架候车层采用钢-混凝土组合楼盖结构体系,最大跨度为28.5m。针对其振动舒适度问题,通过数值模拟研究高架层人行激励和承轨层列车激励下结构的动力时程响应。人致振动研究考虑了多种行走激励,对结构施加固定单人步行、移动单人步行、随机多人步行和固定多人步行等工况,分析其振动舒适度。车致振动研究采用一种简化的列车荷载模型模拟列车激励,研究了列车行驶速度、行驶位置以及列车激励同人行激励耦合对高架层楼盖振动响应的影响。数值模拟结果表明:随机多人步行方法和考虑荷载折减的固定多人步行方法较适合模拟实际人群荷载;列车激励对高架层组合楼盖峰值加速度的影响不可忽略,应通过整体分析进行考虑;各人行激励工况以及列车激励同人行激励耦合工况下的结构振动舒适度均满足规范要求。

The steel-concrete composite floor structure system is used in the elevated waiting hall of Guangzhou Baiyun Railway Station building with a maximum span of 285m.Aiming at its vibration serviceability,the dynamic time-history response of the structure under pedestrian excitation at the elevated level and train excitation at the bearing level was investigated by numerical simulation.The pedestrian-induced excitation study considered various walking excitations to analyze the vibration serviceability of the structure imposed by fixed single-person walking,moving single-person walking,random multi-person walking and fixed multi-person walking.The train-induced excitation take a simplified train load model to simulate the train excitation,then the influence of train speed,train position and coupling of train excitation and pedestrian excitation on the vibration response of the structure was investigated.The numerical simulation results show that:the methods of random multi-person walking and fixed multi-person walking with load reduction are suitable for simulating the actual crowd loads;the influence of train excitation on the peak acceleration of the elevated composite floor system cannot be neglected and should be considered through the overall analysis;the vibration serviceability of each pedestrian excitation condition and the coupling condition of train excitation and pedestrian excitation meets standard requirements.