摘要
根据高架桥桥墩基础的特点,由准三维的轴对称有限元方法得到桥墩基础的阻抗函数,结合桥墩上的实测数据反演得到基础的荷载输入函数。提出以环形填充沟为隔振的措施,其参数综合考虑了土体中波传播的特性和高架桥交通荷载的频率分布特点,并用卓越频率的瑞利波波长和波速进行无量纲化分析。通过比较发现填充沟的厚度,深度以及填充材料相对周围土体的阻抗比都对隔振效果有较大影响。研究结果表明,环形填充沟能够对公路高架桥交通引起的环境振动取到良好的隔振效果。
An innovative approach is developed to derive the load functions at supports of a highway viaduct and a measure of annular in-filled trench is proposed to mitigate the ground vibrations. The pier of the viaduct is assumed to move as a rigid body due to its relatively high rigidity and the light motions caused by traffic. The impedance functions at the pier footing obtained through a quasi-3-dimensional FEM procedure enable the inverse derivation of load functions from the measurement records. Parametric study is carried out on the in-filled trench by taking into account the wave propagation characteristics in the soil and the frequency features of the traffic loads. The results show that the thickness, depth and the impedance ratio of the infilling material to soil influence the isolation effect. Satisfactory reduction can be achieved by the well-designed infilled trench.
出处
《振动工程学报》
EI
CSCD
北大核心
2008年第3期241-247,共7页
Journal of Vibration Engineering
基金
中国博士后科学基金资助项目(20070410184)
上海市博士后科研资助计划项目(07R214145)
关键词
公路高架桥
环境振动
隔振
填充沟
准三维有限元法
highway viaduct
environmental vibration, vibration isolation
in-filled trench
quasi-3D FEM
