【摘要】 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。更多还原

【Abstract】 Based on the target of the test and the theory of vibration isolation,a suspension multidirectional laminar shear model box is developed.This box is a spatial structure system composed of circular frames suspended through steel cables,suspension bracket and motherboard.Theoretical analysis is carried out.The results show that the methodologies of vibration isolation and the structural forms can reduce the effect of the model box on the model soil and the inertia effect caused by the mass of the box itself.The simulated results,the comparison and analysis of the acceleration and the vibration modes of the model soil indicate that the shear deformation is developed in the model soil under horizontal earthquake action and the effect of the box on model soil can be ignored.The suspension multidirectional laminar shear box is very successful in simulating the soil boundary.The arching effect of the model soil can be eliminated.The disadvantage of the existing laminar shear box that earthquake wave only can be input in a single direction can be conquered.更多还原