基础隔震结构耗能及MR智能隔震结构时程分析

【作者】 党育；

【导师】 杜永峰； 李慧；

【作者基本信息】 兰州理工大学 ， 结构工程， 2003， 硕士

【摘要】 本文主要研究了两个问题：基础隔震结构的耗能分析和MR智能隔震结构的时程分析。 对隔震层采用Bouc-wen模型，上部结构采用层间剪切模型，利用状态空间迭代法，对基础隔震结构进行了多质点的弹塑性时程分析，并根据此结果，利用能量方程，求得隔震结构的各项能量，并绘制了各能量的时程曲线。以两个实际工程为例，通过比较非隔震结构与隔震结构的各项耗能情况，说明了基础隔震结构以减少地震输入和隔震层滞回耗能来减小对上部结构的损坏。 由于基础隔震结构还存在一些局限，本文在基础隔震结构上增设MR阻尼器，使结构随地震作用调节阻尼力。对于此体系，利用瞬时最优控制算法，求解出阻尼器在每时刻的最优控制力，并根据MR阻尼器的工作特点，提出了一种界限调节的半主动控制策略，最后对结构进行了时程分析。仿真结果表明，与隔震结构相比，MR智能隔震结构在位移减小的同时，上部结构的加速度略有增加，说明该体系有较好的控振效果。更多还原

【Abstract】 This paper concerns the seismic energy of base isolation and the seismic response of MR damper base isolation. The hysteretic differential Bouc-Wen model is adopted in order to take into account the non-linear behaviour of the base isolation, the superstructure is equivalent linear model. After the non-linear response of building can be calculated in the seismic, the energy analysis is carried out by energy equation. The result of the research show that the base isolation protect the structure by reducing the seismic input energy and increasing isolation hysteretic energy. The isolation system isn’t always effective during a wide range of seismic events, so, MR damper is installed on the base isolation. MR dampers can provide controllable damping force. The control forces in the MR dampers are calculated at every time step by the optimal control theory, the semi-active strategy is proposed. Two numerical simulate smart isolation examples is shown to achieve notable decreases in base drifts and a little increases in superstructure acceleration in contrast to the passive system. It shows the effectiveness of smart isolation system.更多还原