Active structural control by varying boundary strain condition between two different structural components

提出了一种应用主动控制技术的结构设计新思路。其独特的特点是由混凝土墙、斜撑、刚架等不同类型的抗侧结构构件之间的应变提供独特的控制力。在与地震有关的横向荷载作用下，沿其边界可能产生大量的应变。安装在这两个不同部件之间的边界上的弹簧可以产生与应变和它们的刚度成正比的控制力。当使刚度按一定规律变化时，产生的力可用于主动控制。详细讨论了滑模控制理论的应用问题：最优切换面、达到滑模所需的刚度范围、在外界干扰下近似满足Liapnov稳定性判据的实际控制律。在接下来的1自由度系统（1997）和2自由度系统（1998）的计算机模拟分析中，这些问题将以更具体的方式得到澄清。建立了这些系统的微型模型，并进行了实验研究，以确认这种主动结构设计概念在实践中的性能，其中必须允许制造公差误差，数据处理中的时间延迟，动态响应特性，随机机械或电气干扰。试验结果表明，该方案提供了利用主动结构控制作为对抗强震的实用手段的可能性。

A new siructural design concept applying active control techniques is presented. Its distinctive feature is the unique control forces which are supplied by the strain between different kinds of lateral resistant structural components such as concrete walls, diagonal bracings, rigid frames and so on. Substantial strains may be -generated along their boundary during lateral loadings associated with earthquakes. Springs installed at the boundary between these two different components can generate control forces proportional to the strain and Their stiffnesses. When the stiffness is made to vary in accordance with a certain rule, the generated force may be used for active control. Sliding mode control theory is discussed in detail as it applies to problems concerning : the optimum switching surfaces, the range of stiffness required to reach the sliding mode, practical control laws approximately satisfying Liapnov stability criterion under external disturbances. These problems are clarified in a more concrete way in the following computer simulation analyses using 1-degree-of-freedom system(1997) and 2-degree-of-freedomsystem(1998). Miniature model s of These systems were built and experimental studies are also carried out to confirm the performance of This active structural design concept in practice where manufacturing tolerance errors, time delays in data processing, characteristics of dynamic responses, random mechanical or electrical disturbance must be allowed for. The test result shows that This scheme offers a possibility of using active structural control as a practical means to combat severe earthquakes.