列车随机激励下铁路站房结构振动响应分析

列车激励模拟是铁路站房结构振动响应分析首先要解决的问题,目前站房结构振动响应分析中列车激励时程多采用简单列车模型或典型频率谐载组合进行模拟.根据车辆随机振动理论,考虑完整的轨道不平顺谱和轮对间轨道输入相关性,模拟得到基于二系悬挂10自由度列车模型的列车随机激励时程,通过与现有实测数据及模拟时程对比,验证了所得激励时程时频域内的合理性.进行列车随机激励下天津西站大跨度站房结构振动响应分析,研究结构各层振动响应的频谱特性及RMS评价,结果表明：候车厅层振动卓越频率位于人体对竖向振动的最敏感频率范围内,应注意其对人体舒适度的影响.

Vibration Response Analysis of Station Structures Under Train Random Excitations

Simulation of train random excitation is the first and essential step in vibration response analysis of station structures. But currently, simple train moving model and load superposition of several typical frequencies are nor-mally adopted in the simulation. In this paper, a ten-degree secondary suspension train model considering intact track irregularities and correlation among the external inputs on wheels was established, and the effectiveness of the train model was verified in both time and frequency domains by comparing with several other measured data and stochastic models. The vibration responses of Tianjin West Station under train random excitations were analyzed, and the spec- trum characteristics and RMS evaluation of structural layers were summarized. The results indicate that the predomi- nant frequency of the waiting hall is at the most sensitive frequency band of human body during vertical vibration, so human comfort should be considered.