水平2方向同時載荷されたコンクリート充填鋼製橋脚の耐震性能に関するハイブリッド実験

Abstract

To investigate the seismic performance of partially concrete-filled steel bridge piers under actual earthquake excitations, cyclic static loading tests, single - and bi - directional hybrid loading tests were conducted using total 20 test specimens with square section. The height of the filled concrete is changed in 20% and 40% of the pier height. Three different earthquake acceleration data specified in the Japanese design code based on Kobe earthquake are used in the hybrid test. From the experimental results it was observed that the strength and ductility of the steel columns with concrete filled decreased considerably under bi-directional hybrid loading in comparison with those under single-directional hybrid loading, especially for the cases of medium and soft ground. The filled-in concrete was effective in improving the seismic behavior of steel bridge piers, especially for case of sufficient length of concrete filled.