振动台试验三维层状剪切模型箱的设计及性能测试

发布时间：2018-08-02 21:28

【摘要】：在研究地震荷载作用下土-结构动力相互作用的问题和验证方法时,振动台试验被认为是一种有效的工具。试验时应使用合适的模型土箱,试验模型箱的边界效应成为直接影响模型试验结果准确性的重要因素。设计制作了一个由19层圆形环组成的三维层状剪切模型箱,高度为1 800 mm,内径为4 500 mm,层间铝合金框架采用三向运动支撑件连接。开展了模型箱振动台试验,通过埋设在土体中不同深度和位置的加速度计获取的地震反应来研究箱体的边界效应。试验时振动台面输入用于核电工程设计AP1000谱三维地震动。比较了不同深度各测点的加速度时程和反应谱值,计算得到从箱体中心到边缘测点的土体反应的峰值加速度的相对误差值,采用谱比法计算得到加速度反应谱相对误差值。试验及分析结果表明,设计的三维层状剪切模型箱在3个方向上都具有良好的真实场地无限边界条件的模拟效果,解决了现有层状剪切模型箱仅能单向或双向输入水平地震激励的不足。
[Abstract]:The shaking table test is considered to be an effective tool in the study of the dynamic interaction of soil and structure under seismic loads. A suitable model soil box should be used in the test. The boundary effect of the test model box is an important factor that directly affects the accuracy of the model test results. A 19 layer circle is designed and made. A three-dimensional layered shear model box consisting of a shape ring with a height of 1800 mm and an inner diameter of 4500 mm. The interlayer aluminum alloy frame is connected by a three direction motion support. A shaking table test of a model box is carried out. The seismic back stress obtained by an accelerometer embedded in different depths and positions in the soil is carried out to study the boundary effect of the box. The surface input is used for the three-dimensional ground motion of the AP1000 spectrum of nuclear power engineering. The acceleration time history and the response spectrum of each point at different depths are compared. The relative error value of the peak acceleration of the soil reaction from the center of the box to the edge point is calculated. The relative error value of the acceleration response spectrum is calculated by the spectral ratio method. The test and analysis results are obtained. It shows that the designed three-dimensional layered shear model box has a good simulation effect on the infinite boundary conditions of the real site in 3 directions, which solves the deficiency of the existing layered shear model box only one way or two direction input horizontal seismic excitation.
【作者单位】：北京工业大学建筑工程学院;中国地震局地球物理研究所;
【基金】：国家自然科学基金项目(No.51408255,No.51421005) 国家科技重大专项(No.2013ZX06002001)~~
【分类号】：TU411.8

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