Multi-Axial Shake Table (MAST) and Data Acquisition/Control System

多轴振动台 (MAST) 和数据采集/控制系统

• 批准号: 405998-2011
• 负责人: Kwon, OhSung
• 金额: $ 10.59万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Research Tools and Instruments - Category 1 (<$150,000)
• 财政年份: 2010
• 资助国家: 加拿大
• 起止时间: 2010-01-01 至 2011-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=472362
• 关键词: Multi; Axial; Shake; Table; MAST

During an earthquake event, structural elements are subjected to multi-axial loads due to the multiple components of ground motions and seismic response of a structural system. Furthermore, the dynamic interaction of soil, foundation, and structure system develops additional rotational and translational components in foundation input motion. To fully understand how the multi-axial loads affect the seismic response of structural elements, it is essential to use equipment which can apply the multi-axial loads to a structural specimen. The equipment that will be acquired through the NSERC RTI Program consists of a Multi-Axial Shake Table (MAST) and data acquisition/control system. The requested MAST system can simulate earthquake motions in four Degree of Freedoms (DOFs), and will be expandable to a full six DOFs system in the future. The data acquisition/control system will be an interface between the MAST and an analytical model. With the requested equipment a critical component of a structure can be represented by a physical specimen while the rest of the structure can be numerically modeled. The two components can be fully integrated using hybrid simulation methods. The requested equipment will be used to support the NSERC Discovery Grant entitled 'Investigation on the effects of liquefaction and soil-structure-interaction (SSI) on the seismic response of structures. Within the research program, the requested equipment will be used to develop hybrid simulation methods for SSI systems. In addition, the equipment will be used to support other research projects including: 1) the effects of vertical and horizontal ground motions on the response of isolation bearings; 2) investigation of the effects of multi-axial loading on the collapse mechanism of a structural system; and 3) investigation of the transition from equivalent viscous damping to hysteretic damping through a series of small scale dynamic experiments. The research carried out with the equipment will have a direct impact on the society by providing advanced methods for the seismic simulation of structures and by increasing our current understanding of the seismic response of structures subjected to multi-axial loads.

在地震过程中，由于地震动的多个分量和结构系统的地震反应，结构元件受到多轴载荷。此外，土、基础和结构系统的动力相互作用在基础输入运动中产生附加的旋转和平移分量。为了充分了解多轴荷载如何影响结构构件的地震反应，必须使用能够向结构试件施加多轴荷载的设备。将通过NSERC RTI计划获得的设备包括多轴振动台（MAST）和数据采集/控制系统。所要求的MAST系统可以模拟四个自由度（DOF）的地震运动，并将在未来扩展到一个完整的六自由度系统。数据采集/控制系统将是MAST和分析模型之间的接口。使用所要求的设备，结构的关键部件可以由物理样品表示，而结构的其余部分可以进行数值建模。这两个组件可以完全集成使用混合仿真方法。所要求的设备将用于支持NSERC的发现补助金，题为“调查液化和土壤-结构相互作用（SSI）对结构地震反应的影响”。在研究计划中，所要求的设备将用于开发SSI系统的混合仿真方法。此外，该仪器亦会用于其他研究项目，包括：1）垂直及水平地震动对隔震支座反应的影响; 2）多轴荷载对结构系统倒塌机制的影响;及3）通过一系列小规模动力试验，研究等效粘性阻尼向滞回阻尼的过渡。通过为结构的地震模拟提供先进的方法，并通过增加我们目前对承受多轴载荷的结构的地震响应的理解，使用该设备进行的研究将对社会产生直接影响。