Analytical case study on the seismic performance of a curved and skewed reinforced concrete bridge under vertical ground motion

摘要: Abstract Rational representation of seismic demand based on realistic characterization earthquake ground motion is essential for bridge design. Realization the impact vertical has led to an initiative better characterize and simulate scenario typical bridges in near-fault regions, such that structural design practices may improve. Current provisions either do not account effects or specify a simplistic equivalent-static-load methodology. An assessment effect motions horizontally skewed curved highway presented moderate-to-high region. A numerical model curved, three-span located Tacoma, Washington subjected suite horizontal using non-linear time-history analysis. The selected are composed range records with varying component characteristics as site condition, fault distance, vertical-to-horizontal acceleration ratios. represents short vibrational period moderate zone where be applicable, yet considered by codes. results simulations depict considerable from substructure superstructure, including behavior typically documented existing studies. show amplification components substructure, particularly peak accelerations exceeding one. also evaluated against straight counterpart comparable overall configuration. For designers, this study indicate excluding analyses impose larger margin risk than previously perceived. This case regions shorter resonate predominant frequencies motion.