Study About The Magnetorheological Damper And Seismic Hazard Mitigation For Structure

Structure vibration control is a new kind of anti-earthquake technique. Semi-active control is a kind of control technique which compromises between active control and passive control. It only requires small external power source and can produce control results of active control. The advantages of magnetorheological damper (MRD) which were made of magnetorheological fluid (MR) are not only simple structure, small volume, quick respond, small power requirement and adjustable damp forces, but also easily combine with computers. MRD with semi-active control strategy can effectively reduce structure's wind vibration and earthquake response. Thus at home and abroad more and more experts study on MRD, and acquire many achievements, but there are many problems about damper mechanical model and magnetorheological structure's analysis and design etc., so these problems require to be solved and completed.In this paper, the major aim is that advancing a new, simple and accurate mechanical model and establishing analysis design method about magnetorheological structure. The following work is done:(1) The mechanical model of the magnetorheological damper.Base on several mechanical models which are used to analyze the mechanical abilities of MRD a new, simple and accurate mechanical mode梥igmoid is advanced. These kinds of mechanical models which are used to analyze the mechanical abilities of MRD are compared.(2) The elastic-plastic seismic response analysis about the magnetorheological structure.The elastic-plastic seismic response analysis and compared analysis of the magnetorheological structure are carried with semi-active bi-state and foil-state control strategy when structure is simulated by three fold line stiffness retrograde model and MRD is simulated by sigmoid model, and corresponding conclusions are given.(3) The optimum analysis about the magnetorheological structure.Under the fixed optimum goal, the optimum design of the magnetorheological structure is carried by using the method of time-history analysis. An example is given and corresponding calculating program is made.(4) The design method about the magnetorheological structure.In this paper, groundbreaking theories are shown in the following:(a) The new mechanical model of the magnetorheological damper梥igmoid model is advanced.(b) The elastic-plastic dynamic response analysis about the magnetorheological structure is carried with semi-active control strategy.(c) The optimization about the magnetorheological structure is analyzed by using optimum goal.(d) The design method about magnetorheological structure is proposed.