Abstract
Use of brace dampers is an effective way to improve seismic performance of steel arch bridges against major earthquakes. In the design of seismic brace dampers, determination of capacity such as ultimate strain is an important consideration. For this purpose, it is necessary to investigate demand of the seismic brace dampers adopted in steel arch bridges. In this study, time-history analyses of steel arch bridges with brace dampers are performed using 12 earthquake motions, and demand variation of 162 brace dampers is investigated. Moreover, the effect of material grade is also studied. As a result, demand of the seismic brace dampers is clarified and the corresponding required ductility (capacity) is then proposed.
