地铁车站结构振动台试验中传感器位置的优选

Optimization of positions of sensors in shaking table test for subway station structure in soft soil

在对软土地铁车站结构进行振动台模型试验的过程中,对传感器设置位置的优选进行了研究,内容包括按三维问题的分析论证地铁车站结构在横向激振作用下的受力变形特征,据以确定可按平面应变问题进行分析的断面的分布范围及主观测断面的位置;按二维问题的分析论证地铁车站结构在横向激振作用下的变形趋势,据以确定观测断面上传感器设置的优选位置;以及在满足基本信息采集要求的前提下,对可供采用的信息采集通道进行优化分配的方法。成果对试验获得成功起到了保障作用,对同类试验也有参考价值。

The paper describes the study for optimum positions of sensors in the shaking table test for subway station structure in soft soil. The deformation features of subway station structure under the transverse vibration is proved by three-dimensional FEM analysis. On the base of the result, it is determined that includes the scope of section that satisfies the plane strain rules and the position of the main observation section. The deformation tendency of station structure is analyzed by plane strain FEM and the optimum positions of sensors in the observation section is determined. The method is proposed on the premise of satisfying the demand of basic information, which can optimize the distribution of available sampling passages. The achievements guarantee the success of the test and can be referenced by the same type test.