| Earthquakes are generally undetectable,so they are easy to cause some devastating disasters,which we can hardly avoid.At present,only some sensitive instruments can monitor them.Therefore,for our country with many earthquakes,how to adopt corresponding measures scientifically and reasonably to reduce the disasters caused by earthquakes is very important.However,the traditional seismic safety performance is very limited.If an earthquake occurs,the structure can not support it and is likely to cause serious damage and even extremely serious loss of life and property.Among them,the vibration control of civil engineering structures points out a new path for the seismic design of structures.Some devices installed on structures can be used to control and reduce the seismic response of structures.In order to analyze the damping effect of semi-active control of magnetorheological damper,a 20-story building structure was constructed.We need to simplify the calculation model and install magnetorheological damper devices on each floor.First of all,we need to create equations of motion,and then use Runge Kutta method to write out the specific solution of the algorithm.The software is compiled by MATLAB.According to the calculation results of the seismic response of the system,the damping effect of the multi-degree-of-freedom structural system under the semi-active control system of the MR damper is analyzed and compared with that of the AMD optimal control.The following conclusions through Comparison and analysis:The system is effective in vibration mitigation and can be optimized with the reasonable increase of fdmax.A larger fdmaxmax corresponds to larger seismic mitigation efficiency and larger semi-control forces.It might be recognized that seismic mitigation efficiency for storey acceleration is not satisfying.Bang-Bang algorithm for the semi-active magnetorheological dampers are not recommended for buildings with acceleration mitigation requirement.Figure48;Table18;Reference 68... |
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