地铁运行引起的南京鼓楼振动测试与分析

Vibration test and analysis of Nanjing Drum Tower caused by metro operation

为评估南京地铁4号线运行对鼓楼的影响,在地铁开通前和运行后的不同环境下采用振动测试的方法对鼓楼结构振动进行了现场实测。基于实测数据对比,分析了地铁运行对鼓楼的影响,在此基础上结合古建筑安全控制标准对鼓楼的安全性进行了评估;通过1/3倍频程谱分析,研究了引起鼓楼振动的主要频段。结果表明:地铁运行通过时,各结构测点振动量都有所增大,其中碑楼和石碑的振动量增大显著,且鼓楼结构振动具有明显的方向性,部分结构的水平方向振动速率已超出限值;鼓楼结构振动是由路面交通和地铁交通振动共同作用引起的,地铁交通振动影响占主要方面。

In order to evaluate the impact of the operation of Nanjing Metro Line 4 on the Drum Tower,the vibration of the Drum Tower was tested in different environments before and after metro operation. Based on the test data,the impact of metro operation on the Drum Tower was analyzed. Based on this,the safety of the Drum Tower was analyzed by combining the ancient building safety control standard. The main frequency band of the vibration of the Drum Tower was studied by 1 /3 octave spectrum analysis. The results indicate that the vibration responses of the measuring points all increase during metro operation,the vibration increment of timber structure and the Stone Stele is obviously,and the vibration direction of the Drum Tower is obvious. The horizontal vibration velocity of the partial structure has exceeded the limit after metro operation. The vibration of the Drum Tower is caused by grand-induced-traffic and metro-induced vibration,and the metro-induced vibration is the main aspect.