静的正負交番載荷実験によるダブル球面すべり支承の復元力特性

抄録

Laminated-rubber bearings and lead-rubber bearings have been commonly used for bridge bearings in Japan since the 1995 Kobe Earthquake. However, there have been some cases where laminated-rubber bearings were damaged during recent earthquakes. Therefore, there is a need for developing an alternative device for seismic isolation of bridges other than the rubber bearings. In some earthquake prone areas, such as the United States, spherical sliding bearings are applied for bridges as base-isolation. This paper presents a series of static cyclic loading tests of a bridge superstructure supported by four spherical sliding bearings as a seismic isolation system. The double spherical sliding bearing, having two facing concave plates and a slider, was used as the seismic isolation device. The theoretical mechanical behavior of spherical sliding bearings was verified by the experimental results.