【摘要】 针对双态控制易引起结构加速度局部放大和三态控制中刚度不易确定的问题,提出以速度响应作为状态切换参数的多态控制策略。以磁流变阻尼结构为例对采用不同的速度切换参数大小、输入地震动强度、场地类别和结构周期等相关因素对结构地震反应控制效果进行对比分析,发现存在一个对加速度响应的最优速度控制参数。并利用遗传算法对状态切换参数的取值进行优化计算,得到其简化计算公式。通过对一装有磁流变阻尼器的三层钢筋混凝土框架-剪力墙结构的振动台试验,对比分析多态控制策略与passive-off、passive-on和双态控制的控制效果。研究结果表明,多态控制策略比其它控制策略能更有效地控制结构反应,实用性较强;提出的速度切换参数估算公式是合理的。更多还原

【Abstract】 The multi-state control strategy is developed, where the velocity response is regarde as state-switch parameter, of and the amplified local acceleration response in bi-state control and the difficultly determied stiffness in tri-state control, are paid attention. Different control parameter, different peak value of input earthquake excitation, and different type of site and different period of structures are comparatively investigated in the numerical examples of magnetorheological structure. It is found that an optimal velocity response exists as the state-switch parameter for reducing the absolute acceleration. Selecting multi-state strategy, passive-off, passive-on and the double-state method, the shaking table experiments of a three-flour reinforced structure with a magnetorheological damper are conducted respectively. The results show that the multi-state control strategy is more effective with higher practicability.更多还原