Using full bridge numerical model to develop analytical fragility curves

Abstract

Using full bridge model to develop analytical fragility curves for typical concrete bridge piersThis study shows the effect of various numerical models on the development of analytical fragility curves for bridge piers. Two distinct models are compared: model with a single degree of freedom, and the proposed full bridge model. Bridge pier damage indexes are obtained by performing both dynamic and static nonlinear analyses (pushover and time history analysis), in order to develop fragility curves for this bridge pier. It was observed that capacity curves, ductility curves, and fragility curves, are sensitive to structural modelling.Primjena numeričkog modela cijelog mosta u analitičkom postupku izrade krivulja vjerojatnosti oštećenja U radu se analizira utjecaj različitih numeričkih modela mosta na definiranje krivulja vjerojatnosti oštećenja njihovih stupova analitičkim postupkom. Uspoređuju se dva različita modela, model s jednim stupnjem slobode te predloženi model cijelog mosta. Za potrebe određivanja krivulja vjerojatnosti oštećenja promatranog stupa, određeni su njegovi indeksi oštećenja pomoću dinamičke i statičke nelinearne analize (metoda postupnog guranja i time-history analiza). Utvrđeno je da način modeliranja utječe na krivulje nosivosti, duktilnosti i vjerojatnosti oštećenja. Ključne riječi: krivulje vjerojatnosti oštećenja, metoda postupnog guranja, seizmička oštetljivost, model stupa mosta Übersichtsarbeit Nadjib Hemaidi Zourgui, Abderrahmane Kibboua, Mohamed Taki Anwendung eines Vollbrückenmodells im analytischen Verfahren zur Erstellung der Wahrscheinlichkeitskurve der Beschädigungen In der Abhandlung wird der Einfluss verschiedener nummerischer Brückenmodelle auf die Festlegung der Wahrscheinlichkeitskurve der Beschädigungen ihrer Pfeiler durch ein analytisches Verfahren analysiert. Verglichen werden zwei unterschiedliche Modelle, das Modell mit einem Freiheitsgrad sowie das vorgeschlagene Vollbrückenmodell. Zum Zweck der Festlegung der Wahrscheinlichkeitskurve der Beschädigung des betrachteten Pfeilers wurde sein Beschädigungsindex mithilfe der dynamischen und statischen nicht linearen Analyse (Methode der inelastischen statischen Untersuchung und Time-history-Analyse) festgelegt. Festgestellt wurde, dass die Art der Modellierung die Tragfähigkeits-, Duktilitäts-und Wahrscheinlichkeitskurven der Beschädigung beeinflusst. Schlüsselwörter: Wahrscheinlichkeitskurve der Beschädigung, Methode der inelastischen statischen Untersuchung, seismische Beschädigbarkeit

Revising Seismic Vulnerability of Bridges Based on Bayesian Updating Method to Evaluate Traffic Capacity of Bridges

“…Based on existing research [43,44], the upper bound of the corrected seismic vulnerability curves of Guxigou Middle Bridge corresponding to each damage state were taken as the basis for calculating traffic flow. According to the references [42,43], the probabilistic results and expected values (the values ∈ [0, 4], where, 0 is no damage state and 4 is complete damage state) assigned for each damage level were combined to obtain the average damage level value l b of Guxigou Middle Bridge under different ground motion intensity, which can be calculated by Equation (12). l b = 0 * P f ,DS 1 + 1 * P f ,DS 2 + 2 * P f ,DS 3 + 3 * P f ,DS 4 + 4 * P f ,DS 5 (12) In this paper, the design speed v c of Guxigou Middle Bridge was 100 km/h, the number of lanes b was 3, and the minimum distance s min between the two vehicles at the design speed was 100 m. The designed critical flow f co was the critical value of traffic flow at the beginning of congested road conditions (that is the actual traffic capacity).…”

“…At present, the analysis of seismic performance of bridges under different working conditions usually takes the form of seismic vulnerability curves [10][11][12][13]. An empirical and theoretical method was used to construct the seismic vulnerability curves by researchers [14,15].…”