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在建设省土木研究所等单位的指导下,日本于1991年3月建成首座免震桥——静罔县气田川上的宫川桥,并开始投入使用。这座桥长105.8米、高11米,共三跨中间跨长39米,两边跨长各32.85米。它是由建设省道路局免震桥梁连络会按日本的地震、地质等条件,开发的免震设计法并进行现场试验的工程项目。所谓免震设计法是通过柔性结构吸收地基震动,使地震时建筑物的振动比以往有大幅度的减低。其设计要点是让建筑物在水平方向
Under the guidance of the Provincial Institute of Civil Engineering and other units, Japan built Miyagawa Bridge, the first quake-avoiding bridge in January 1991, and was put into operation. The bridge is 105.8 meters long and 11 meters high, spanning 39 meters across three spans, spanning 32.85 meters on both sides. It is constructed by the Provincial Highway Bureau quake-free bridge contact will be based on Japan’s earthquake, geology and other conditions, the development of seismic design and field test project. The so-called earthquake-free design method is to absorb the vibration of the foundation through the flexible structure so that the vibration of the building during the earthquake can be greatly reduced than before. The design point is to let the building in the horizontal direction