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概念。它的显著特点是由混凝土墙体、斜撑、刚架等不同抗侧构件之间的应变提供独特的控制力。在与地震相关的横向加载过程中，它们的边界可能会产生巨大的应变。安装在这两个不同部件之间的边界处的弹簧可以产生与应变及其刚度成比例的控制力。当使刚度按照一定的规则变化时，所产生的力可以用于主动控制。详细讨论了滑模控制理论在最优切换面、达到滑模所需的刚度范围、实际控制律在外部扰动下近似满足Liapnov稳定性准则等问题上的应用。在接下来的使用1自由度系统(1997)和2自由度系统(1998)的计算机模拟分析中，这些问题得到了更具体的阐明。建立了这些系统的微型模型S，并进行了实验研究，以证实这种主动结构设计概念在实践中的性能，其中必须考虑制造公差误差、数据处理中的时延、动态响应特性、随机机械或电气干扰。试验结果表明，该方案为结构主动控制作为一种实用的抗震措施提供了可能。

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.