Study on Applicability of a Pushover Analysis Method for Seismic Analysis of Long-Span Continuous Rigid Frame Bridge with High Piers

摘要

Long-span continuous rigid frame Bridges is major bridge type for application of high piers, so an in-depth study about its seismic performance, earthquake damage and the process of destruction has important significance. The typical nonlinear numerical analysis model is built for long-span continuous rigid frame bridge with high piers based on the fiber model. A special Pushover method is proposed for nonlinear analysis on the structure under the earthquake in longitudinal and transversal direction respectively. Incremental Dynamic Analysis method is performed with the nonlinear dynamic history analysis for comparison the results. The failure law is analyzed by material fracture criterion with index of strain. A typical continuous rigid frame bridge with piers with various heights suffered longitudinal and transversal earthquake is analyzed, considering the higher-order effects. The applicability of Pushover method is discussed. The damage order and the characteristics of the element are studied. The relationship between maximum displacement or maximum curvature, with the strain limit are discussed. The internal force, deformation of piers, and curvature along the high of pier are analyzed.