城市交通高架轨道振动衰减的快速预报

Fast Prediction on the Vibration Caused by Urban Elevated Railway

为研究城市交通高架轨道振动衰减规律,建立有限元振动分析模型,计算了不同高架结构参数情况下振动沿高架结构及地面的衰减情况,分析了结构尺寸及材料参数对振动衰减的影响规律,并根据有限元计算结果提出了结构振动传递损失的快速预报公式.为验证公式的有效性,对某高架轨道交通周边的振动情况进行了实测,实测值与预估值变化趋势一致,误差在可接受范围内.结果表明,高架结构尺寸及桩的深度对振动传递损失影响较小;快速预报公式对高架轨道交通振动快速预报及其环境振动的控制有一定的工程指导意义.

A finite element vibration analysis model was established to investigate the attenuation of the vi- bration caused by urban elevated railways. Then the vibration attenuation along the elevated structure and the surrounding ground was calculated in different conditions. The effects of structural dimensions and ma- terial parameters on the attenuation of vibration were analyzed, and a formula for fast prediction of the transmission loss of structural vibration energy was derived according to the results of finite element calcu- lation. In order to validate the formula, vibration measurements were conducted at an elevated railway and its surrounding ground. It is shown that the trend of the measurement results is consistent with the predic- tion results with an acceptable accuracy. A minor effect of structural dimensions and material parameters on the attenuation of vibration is observed. The conclusion is meaningful to the control of environmental vibration and fast prediction of the vibration around the elevated rail and its surroundings.