列车振动对铁路沿线结构物影响的动力分析

在魏善庄－安定道口处进行了测量试验，沿钢轨布置了６个测点，测得１８趟列车振动时产生的１０８条加速度波形，并进行了数据处理和分析，对每条加速度－时间历程曲线的均值进行了统计，通过最小二乘法拟合出加速度均值随距离衰减的相关函数，并在距钢轨１０ｍ处模拟了三个不同跨度的网架，分别进行了静力、自振频率和振型以及动力响应的计算，并把动力计算与静力计算进行了比较，得出动力响应与结构跨度之间的关系．

Dynamic Analysis of the Influence of Train Railway Vibration on the Building Along Railways

The practical tests were carried out at An Ding cross of Weishan Village. We fixed up 6 pickup points along the rail. One hundred and eighteen acceleration waves were picked up under the condition of different train speeds, and the data were handled and analyzed. By the statistic to average values of each acceleration time curve, its die away curve function with distance was drawn up according to the least square method. As examples three trusses with different spans at the pick up point of 10 m from the rail,were chosen to calculate their static forces self vibration frequency, vibration shape and dynamic response. With the comparison between static results and dynamic ones, a relationship connected with dynamic response and different structural spans was gained.