超高層建物のアクティブブレース付加による制振および最適配置法の検討

These days, there are a lot of high-rise buildings and it is important for these buildings to be reinforced against earthquakes. As a device to reduce the response of the building, active braces are used. In this paper, their optimal placement method to reduce building's response by limited number of them is researched.Firstly, to search optimal placement to set active braces, response comparisons of four setting patterns, which are named Upper, Lower, Middle and Uniform, are carried using sine waves. These sine waves have the same periods with natural periods of the building. It shows that control forces become large at layers which story drifts are large. Thus, the values of the feedback gain matrix on Linear Quadratic Regulator (LQR) method are compared. It appears that the feedback gain matrix has large gains where they are related to displacement. In addition, equation of control force shows each layer's story drift has a great influence on deciding control forces.Secondary, setting methods named MSD and NOD are proposed and their effectiveness is verified. MSD places active braces around the layers which will have large story drift and NOD places them around nodal points. In this paper, two earthquakes which have large power on building's 1st or 2nd natural period are used. It is confirmed that Lower pattern is effective for the 1st mode earthquake, but against the 2nd mode earthquake, Upper pattern is more effective. So these setting patterns can't work effectively for all earthquakes. About MSD and NOD pattern, though their effectiveness aren't the best, but they can reduce responses against several frequencies. This means that they can work more effectively for several types of earthquakes.Thirdly, to research the safer setting method, the robustness is compared when one active brace breaks down at upper, lower or middle layer. In this paper, three setting patterns, MSD, NOD and Uniform, are used to compare. On almost all of the layers, responses of Uniform became larger than MSD and NOD when the break down happened. From the comparison of MSD and NOD, when the break down happened at lower and middle layer, responses of each layer don't show large difference. But the case when the break down happened at upper layer, responses of NOD pattern became larger than that of MSD pattern. It means MSD pattern has more active braces at effective layers than NOD.In this paper, effectiveness comparison on four simple patterns shows that control forces become