交通振动对邻近古建筑的动力影响测试分析

对北京地铁2号线和在建直径线邻近古建筑（明城墙遗址和京奉铁路正阳门老车站旧址）现场测试,评估其在既有地铁交通和路面交通作用下的振动响应,并研究古建筑结构振动响应的传播规律.测试结果表明：1）时域内,古建筑结构在地铁运营下的振动响应是路面交通的10倍左右;交通振动引起古建筑结构的动力响应随水平距离和竖直距离呈规律改变,且古建筑结构以水平方向动力响应为主;2）频域内,地铁交通引起古建筑响应的主要频段是40-90 Hz,路面交通引起古建筑响应的主要频段是10-20 Hz,且路面交通引起的古建筑振动速度在一定范围内出现放大现象.

Tests and analysis of traffic-induced vibration effects on surrounding historic buildings

Through in site testing,the vibration responses induced by the existing Metro Line2 and ground traffic and assessment of two historic buildings（Ⅰ-the Ming Dynasty Wall,Ⅱ-the Old Railway Station）,which are in close proximity to the existing metro lines and the new Diameter line in Beijing,are presented in this paper.Vibration propagation law in historic buildings along the horizontal and vertical direction is also studied.The results indicate that： 1） in the time domain,the dynamic response amplitudes induced by metro operations are 10 times than those induced by ground traffic.The dynamic response in historic structures varies regularly along with the horizontal and vertical distance.The horizontal dynamic response is a major factor in the historic building structure;2） in the frequency domain,the main band of metro-induced dynamic response in historic structure is 40～90 Hz,the main response band of ground-trafficinduced vibration is 10～20 Hz,and the dynamic response of velocity in historic structures induced by ground traffic amplifies at a certain distance away from the traffic.