In 1960s, bearing plate bearings had been developed as low friction and low height bearings for bridges. Among them, BP-A bearings were widely used in railway and highway bridges, but due to severe environmental conditions for a long period of time, they are deteriorated and sometimes causes serious problem of superstructures. In this study, horizontal and rotational cyclic loading tests of 40-years old BP-A bearings are conducted to evaluate the movement following performance. Especially because movement of the bearing plate is directly measured, the potential deterioration factors can be clarified.
