DEVELOPMENT OF DIE AND ROD FRICTION DAMPER FOR EI MIC RETROFITTING ON ROAD BRIDGE

Abstract

 The remaining function after a Level 2 earthquake has become important issue of road bridges design in Japan. Authors have proposed a seismic retrofit method that die-and-rod friction dampers are installed in bearing parts of existing bridges in the bridge axial rectangular direction. This method does not impair the soundness of bridges against Level 1 earthquake, and improves earthquake resistance against Level 2 earthquake. This paper describes the results of static and dynamic load tests on the damper. As a result of the experiment, it was confirmed that the damper exhibits performance such as having a rigid-plastic hysteretic characteristics even at dynamic load test exceeding the maximum speed of 100 cm / sec.