Concrete Columns that Don't Collapse Easily During Large Earthquakes

摘要

In the Hanshin-Awaji Earthquake disaster, many reinforced concrete rigid-framed viaducts for thernrailway collapsed by the failure of the columns. Therefore, the predicted earthquake has beenrngreatly improved in design standard. However, because the ductility of the reinforced concreterncolumn by the reinforcing bar arrangement at that time was insufficient, it was necessary to increasernthe yield seismic coefficient. Then, authors confirmed experimentally the new method of thernreinforcing bar arrangement that was able to take more than twice ductility at that time. This newrnmethod is that a method of arranging a lot of circle hoop reinforcements inside of the longitudinalrnreinforcements instead of arranging many hoop reinforcements outside of the longitudinalrnreinforcements. Now, the all reinforced concrete rigid-framed viaducts for the railway designed inrnEast Japan Railway Company adopt this new method.