Seismic assessment of existing reinforced concrete arch bridges

Abstract

A new seismic assessment procedure for arch bridges is presented in the paper. The linear response spectrum analysis and the nonlinear static pushover methods are combined in this procedure through various assessment levels and appropriate checks. Guidelines for collecting arch-bridge data needed to reach the required level of knowledge on structural properties are proposed. Criteria for seismic assessment, such as the required participation of effective modal masses, adequate stiffness distribution of spandrel columns, and determination of reference point for forming capacity curves, are improved and adjusted for arch bridges. Seizmičko ocjenjivanje postojećih armiranobetonskih lučnih mostovaU ovome je radu prikazana nova metoda seizmičkog ocjenjivanja lučnih mostova. Linearni proračun metodom spektralne analize i nelinearne statičke metode postupnog guranja kombiniraju se u ovoj proceduri kroz razine ocjenjivanja i pripadne provjere. Predlažu se smjernice za prikupljanje podataka o lučnim mostovima s ciljem ostvarivanja tražene razine poznavanja konstrukcije. Pritom su kriteriji za seizmičku ocjenu, primjerice zahtijevano sudjelovanje djelotvorne modalne mase, prikladna raspodjela krutosti nadlučnih stupova i utvrđivanje poredbene točke za formiranje krivulja kapaciteta, ovom metodom poboljšani i prilagođeni lučnim mostovima. Seismische Begutachtung bestehender Bogenbrücken aus StahlbetonIn dieser Arbeit wird eine neue Methode der seismischen Begutachtung von Bogenbrücken dargestellt. Dabei werden lineare Antwortspektrum-Analysen und nichtlineare statische Pushover-Methoden durch Bewertungsstufen und entsprechende Nachweise kombiniert. Ebenso werden Richtlinien für die Zusammenstellung von Datenbanken gegeben, die das Erzielen der angestrebten Kenntnisstufe ermöglichen. Kriterien für die seismische Begutachtung, wie beispielsweise die erforderliche Teilnahme der effektiven modalen Masse, die angemessene Steifigkeitsverteilung der Brückenstützen und die Berechnung des Leistungspunktes bei der Ermittlung der Kapazitätskurve sind durch diesen Vorgang verbessert und der Bewertung von Bogenbrücken angepasst worden. Schlüsselwörter:Bogenbrücken, Seismische Begutachtung, lineare Antwortspektrum-Analyse, nichtlineare statische Pushover-Methode

Seismic Assessment and Retrofitting of Existing Road Bridges: State of the Art Review

“…As the older bridges (e.g., the Pag Bridge and the Šibenik Bridge) were constructed with only moderate seismic loads, there was a need for a practical and efficient seismic load assessment method. A multi-step method was developed in [ 27 ], with the first step being linear multimodal analysis, followed by the limit state checks. If the bridge does not meet the requirements, the evaluation is performed again at the second stage, where nonlinear pushover analysis is used.…”

“…As the connection between the piers and superstructure is hinged in the longitudinal direction, the longitudinal resulting force is transferred to abutments. The seismic analysis was conducted both using linear modal analysis and nonlinear static pushover analysis, using the multi-level method developed by Franteović et al [ 27 ] in accordance with current design codes. In the first step of the analysis, the target displacement for both the longitudinal and transverse direction was obtained using linear modal analysis.…”

Plastic Joints in Bridge Columns of Atypical Cross-Sections with Smooth Reinforcement without Seismic Details

“…In general, previous research on structural elements has focused on elements typical of high-rise buildings (beams, columns), which are produced with ribbed reinforcement [10][11][12][13][14] while a smaller number of studies evaluate the seismic resistance of bridges, especially girders [15][16][17] and arches [18][19][20][21]. By analyzing the main parameters of the seismic resistance indicators [22][23][24], selecting a suitable evaluation method [25], and using the currently available guidelines for the evaluation of structures [26] and recent research in this field [10][11][12][13][14], it is possible to determine seismic resistance reserves of bridges that have not been previously designed and detailed for such actions.…”

“…Nonlinear methods are mainly used to assess the seismic load-bearing capacity of existing bridges [25][26][27]. The application of such methods requires the knowledge of the actual behavior of the structure, either the actual rotational capacity of the elements under static load, if non-linear static analyses are used, or under cyclic load, if non-linear dynamic analyses are used.…”

Bending moment curvature relationship as an indicator of seismic resistance of older bridge piers

“…A review of literature relating to the field of seismic resistance reveals that most of the research has been focusing on the calculation and design of new bridges or buildings [1][2][3][4][5]. The existing bridge structures, often designed according to former seismic regulations, or even devoid of any seismic design, may still contain reserves of seismic resistance that should be detected using appropriate assessment methods [6,7] and suitable seismic performance indicators [8][9][10]. The seismic resistance of bridges is affected by a number of parameters.…”