Development of Horizontal 2-Directional Loading Hybrid Test for Steel Bridge Piers

Since the Great Kobe Earthquake in 1995, the seismic design of infrastructures in Japan was revised greatly in many items. But as far as the bridge piers are concerned, the design concept based on the conventional single directional seismic force has remained, not taking into account the actual bi-directional horizontal seismic forces. In this study, a hybrid test system for the response of steel piers under the bi-directional earthquake force is developed and tested. The difference of response and resistance forces between single and double directional hybrid test was discussed. Moreover a quasi-hybrid test method (dynamic analysis) was proposed and compared with the result of single direction hybrid test