摘要
高架桥行车引起的环境振动与地面行车荷载引起的振动不同在于其引起的振动通过桥墩传给大地,属于点振源问题,而后者是移动振源。通过现场测试,探讨了高架桥车辆荷载引起的环境振动传播规律和衰减特点,分析其与地面交通荷载引起的振动差异。实测数据表明:(1)地面交通荷载随距离的增加,铅垂向加速度幅值衰减很快,距道路中心线30 m外,加速度幅值逐渐趋于平稳,距道路中心线40 m处振动略有放大,后逐渐减小并趋于稳定;(2)地面交通荷载随距离的增加,振动的高频分量迅速衰减,各测点振动的振级也逐渐降低;(3)相对于地面交通荷载引起的振动而言,高架桥行车引起的振动较小。研究成果可为交通荷载作用下沿线周边环境的评价提供依据。
The main difference of environment vibration caused by vehicle running on viaduct and on ground surface is that the vibration induced by the former transmitted to the soil through piers and the vibration source is a point load, while the latter is a moving vibration source. The vibration propagation rules under viaduct vehicle loads and its attenuation characters were discussed in the paper by field measurement and theoretical analysis,and the differences of vibration caused by viaduct vehicle loads and ground traffic loads were also analyzed. The test data and theoretical analysis showed that：（ 1） With the increase of the distance of ground traffic load,vertical acceleration amplitude attenuation quickly,a distance of 30 m outside the center line,the acceleration amplitude gradually leveled off,40 m from line vibration slightly enlarged,after gradually reduced and tends to be stable;（ 2） The high frequency component of vibration attenuation quickly with the increase of the distance of ground traffic load,and each measuring point vibration level also reduce gradually;（ 3）The vibration caused by viaduct is smaller compared to that induced by ground traffic loads. The research results in the paper can provide references for environment vibration evaluation under traffic loads.
出处
《土木工程与管理学报》
北大核心
2015年第1期19-22,共4页
Journal of Civil Engineering and Management
基金
国家自然科学基金(51178365)
关键词
振动
高架桥
现场测试
环境影响
vibration
viaduct
field measurement
environment influence
