Development of a Simple Seismic Isolation Table and Its Application to an Earthquake-Proof Device for a House

首先，研制了一种采用四对半圆弧弹簧和磁阻尼器的新型隔震台。隔震台结构简单，各水平方向的刚度和阻尼相同。计算了隔振台对两种地震波的反应谱，证实了隔振台在较宽的隔振质量范围内具有隔振效果。制作了试验隔震表，并对其阻力特性进行了理论和实验讨论。采用电液式振动机对3层塔式板式隔震台的地震响应进行了测量。将实验结果与计算结果进行了比较，验证了工作台的隔振效果。研制了一种采用齿条和小齿轮的新型磁阻尼器。该阻尼器行程长，适用于建筑物高层安装的机器或隔震台的隔震装置。制作了试验阻尼器，并通过实验和数值验证了该阻尼器对机械隔振系统的抑制效果。然后，假设采用采用半圆弧弹簧和磁阻尼器的隔震台作为房屋的动力减振器，计算了3层木结构房屋的地震响应。通过改变减振器的阻尼和频率比进行了计算，并对减振器的减振效果进行了检验。制作了动力减振器试验件和3层房屋模型，用振动仪测量了房屋模型的地震响应和频率响应。计算结果和试验结果表明，动力减振器对三层房屋模型的振动有一定的抑制作用。少

First, a new type of seismic isolation table using four pairs of semicircular arc springs and a magnetic damper was developed. The isolation table is simple in construction and has the same stiffness and damping in every horizontal directions. The response spectra of the isolation table for two kinds of earthquake waves were calculated, and it was confirmed that the table has the effects of vibration isolation in a wide range of the table mass. The trial isolation table was made and its resisting force characteristics were discussed theoretically and experimentally. The seismic responses of the isolation table having 3-story tower-like structure on board were measured using an electrohydraulic type vibration machine. The experimental results were compared with the calculated results, and the effects of vibration isolation of the table were substantiated.A new type of magnetic damper using racks and pinions was also developed. The damper has a long stroke and is suitable for a seismic i … More solation device for a machine or a seismic isolation table, which are installed on a high story in a building. The trial damper was made, and the effects of vibration suppression of the damper for a machine-isolation system were confirmed experimantally and numerically.Next, the seismic responses of a 3-story wooden house were calculated on the supposition that the isolation table using semicircular arc springs and a magnetic damper was used as a dynamic vibration absorber for the house. The calculations were carried out by changing the damping and frequency ratios of the absorber, and the effects of vibration suppression of the absorber were examined. The trial dynamic vibration absorber and a 3-story house model were made, and the seismic and frequency responses of the house model were measured using the vibration machine. The calculated results as well as the experimental results showed that the dynamic vibration absorber has an effect on the vibration suppression of the 3-story house model. Less