Development of Shaking Table Techniques Using Segmentation Concept toward More Generalized Dynamic Loading Test

动荷载试验对推进地震工程具有重要意义。由于成本高，动态加载系统通常在尺寸上受到限制。然而，随着用于减轻地震灾害的各种阻尼装置的发展，对动载荷试验的需求也在增加。本研究开发了增加振动台功率的方法，即位移、速度和频率能力，通过增加连接到振动台的额外部分。线性滚子滑块与压载物组合形成位移增强段，两个弹簧质量系统连续碰撞形成频率增强段。为了保证在线段上的准确响应，开发了各种控制算法。针对安装在基地隔离医疗设施中的医疗器械的行为，对所提议系统的有效性进行了检验。

Dynamic loading test is useful for the advancement of earthquake engineering. Due to high cost among others, dynamic loading systems are commonly limited in size. Needs for dynamic loading test, however, increases in conjunction with the development of various damping devices used for mitigation of earthquake disasters. This study develops methods that increase the power, i.e., the displacement, velocity, and frequency capacities, of shaking tables, by the addition of extra segments that are connected to the shaking table. A displacement enhancing segment is developed by a combination of linear roller sliders and ballast, while a frequency enhancing segment is developed by the production of continuous collision between two spring-mass systems. To ensure accurate response on the segment, various control algorithms are developed. Effectiveness of the proposed system is examined for the behavior of medical appliances installed in a base-isolated medical facility.