论文部分内容阅读
根据试验目的,运用悬挂隔振和滚珠隔振的理论,设计了悬挂式层状多向剪切模型箱装置。该装置是由钢索吊起的多层圆形框架、悬挂支架和底板组成的空间结构体系。通过对这种新的模型箱结构形式的理论分析,论证了所采用的模型箱结构形式和隔振措施能有效的减少模型箱对模型土振动特性的影响,大大削弱了模型箱自身质量引起的惯性作用对模型土动力响应的影响。通过数值模拟和对试验中模型土加速度时程的对比分析以及模型土的振型分析,论证了在水平地震激励作用下,模型土产生层状剪切变形,且各部分模型土的地震响应一致,能有效模拟土体的侧向变形边界条件。该模型箱既消除了现有柔性模型箱在水平地震激励作用下产生的土体拱效应现象,也克服了现有层状剪切模型箱仅能单向输入水平地震激励的不足。
According to the test purpose, the hanging layered multi-directional shear model box device is designed by using the theory of suspension vibration isolation and ball vibration isolation. The device is a multi-layer circular frame lifted by a wire rope, a suspension structure and a floor structure system. Through the theoretical analysis of the structure of this new model box, it is demonstrated that the adopted model box structure and vibration isolation measures can effectively reduce the impact of the model box on the vibration characteristics of the model soil, greatly weakened the quality of the model box itself Influence of Inertia on Dynamic Response of Soil Model. Through numerical analysis and comparative analysis of the model acceleration time history of the model soil and modal analysis of the model soil, it is demonstrated that under the action of horizontal seismic excitation, the model soil produces stratified shear deformation and the seismic response of each model soil is consistent , Which can effectively simulate the lateral deformation boundary conditions of soil. The model box not only eliminates the phenomenon of soil arching produced by the existing flexible model box under horizontal seismic excitation, but also overcomes the shortcomings of the existing layered model box that can only input horizontal seismic excitation unilaterally.