Probabilistic seismic demand model for curved reinforced concrete bridges

摘要: This article examines the seismic behaviour of curved box-girder concrete highway overpass bridges commonly built in California. In particular, a probabilistic demand model for 5-span reinforced with single circular column bents is developed. The principal parameter bridge curve radius horizontal plane, varying from infinity (representing straight bridge) to sharp equal length bridge. Three prototypes are analyzed: (1) tall-column relatively low lateral stiffness; (2) designed California and (3) short-column high stiffness. A analysis, including modal analysis an evaluation nonlinear static dynamic response, performed each prototype value. magnitude-distance bin approach used cover range plausible ground motion scenarios. models cast terms one engineering parameter, drift ratio, two intensity measures: peak displacement or velocity, spectral at fundamental period bridge, Sd(T1). show increase transverse-direction ratio sharply bridges.