scholarly journals Fatigue of steel bridges

2018 ◽  
Author(s):  
Ulrike Kuhlmann ◽  
Simon Bove ◽  
Stephanie Breunig ◽  
Karl Drebenstedt
Keyword(s):  
Thick Plate ◽  
Steel Bridges ◽  
Final Conclusion ◽  
Railway Bridges ◽  
Application Range ◽  
Truss Bridges ◽  
Traffic Loads ◽  
Eurocode 3 ◽  
Fatigue Evaluation ◽  
Nominal Stress Approach

Highway and railway bridges are exposed to cyclic stressing due to traffic loads and, therefore, have to be evaluated concerning fatigue. In most cases the fatigue evaluation is performed according to Eurocode 3 Part 1-9 on nominal stresses. To apply this nominal stress approach a detail catalogue is required classifying all relevant constructional details in terms of fatigue. Unfortunately, the existing detail catalogue of Eurocode 3 Part 1-9 reflects the state of the art of the 1990s and misses constructional details being important for today’s bridge design. As an example the derivation of a new detail, the so-called lamellae joint, is presented. Furthermore, for two new types of innovative steel bridges, where Eurocode 3 Part 1-9 does not yet specify rules able to evaluate the characteristics of these bridges, research results are shown. These are the thick-plate trough bridges and truss bridges made of thick-walled circular hollow sections (CHS). The paper starts with an overview on the recent Eurocode developments, addressing more specific the fatigue verification according to EN 1993-1-9 and the statistical analysis of fatigue test data. In the following, information is given on the outcome of some recent research projects striving to extend the application range of Eurocode 3 Part 1-9. The final conclusion, in spite of all differences, show a common tendency.  

Lastannahmen im Brückenbau – Vergleich von Verkehrslasten für Eisenbahnbrücken aus Lastmodellen und Messdaten/Actions on bridges – A comparison of traffic loads for railway bridges from traffic load models and measured data

Bauingenieur ◽  
2016 ◽  
Vol 91 (10) ◽  
pp. 410-416
Author(s):  
Gerhard Lener ◽  
Johannes Schmid
Keyword(s):  
Measured Data ◽  
Traffic Load ◽  
Railway Bridges ◽  
Load Models ◽  
Traffic Loads

Sowohl bei der ursprünglichen Dimensionierung als auch bei allfälligen Sanierungsvorhaben bedingen die Einwirkungen aus Verkehrslasten die Bauteilabmessungen maßgeblich. In vielen Fällen sind ältere Tragwerke nach heutigen Bemessungsrichtlinien deutlich unterdimensioniert, wodurch im Falle von Erweiterungsmaßnahmen zusätzliche Verstärkungsmaßnahmen im Bestand anfallen. Des Weiteren ist die Beurteilung der Restlebensdauer solcher Tragwerke in der Praxis schwierig, da in der Regel keine Informationen hinsichtlich der realen Einwirkungen aus Verkehrslasten vorhanden sind. Durch diesen unbefriedigenden Zustand motiviert, erfolgt in diesem Beitrag eine nähere Untersuchung realer, messtechnisch erfasster Einwirkungen auf Eisenbahnbrücken. Diese bilden die Basis für Vergleiche der Auswirkungen realer Messdaten und normativen Lastmodellen, die rechnerisch an unterschiedlichen Tragsystemen gezeigt werden. Dabei sind die im Vergleich zu den genormten Belastungen doch maßgeblich geringeren Einwirkungen deutlich erkennbar und liefern damit möglicherweise die Antwort auf die Frage, warum einzelne Eisenbahnbrücken nach wie vor funktionieren, obwohl deren rechnerische Lebensdauer bereits erreicht ist. Des Weiteren zeigt sich das daraus resultierende Optimierungspotenzial bei der Aktivierung von Realtragreserven beziehungsweise der deutlich höherer anzusetzender Lebenserwartung bestehender Tragwerke.

AN EXAMINATION OF HYBRID STRUCTURES RENOVATED FROM OLD RAILWAY STEEL BRIDGES

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
Nozomu Taniguchi ◽  
Fujikazu Ohkubo ◽  
Shinya Satake ◽  
Yusuke Sugino
Keyword(s):  
Noise Reduction ◽  
Steel Bridges ◽  
Noise Measurement ◽  
Hybrid Structures ◽  
New Materials ◽  
Railway Bridges ◽  
Impact Tests ◽  
Hammer Impact

This research offers a new composite-revamping method for railway bridges. It assumes that the composite remodeling process of existing steel bridges has no specific fissure damages or serious corrosion, and effectively makes use of relatively new materials. The effects of noise reduction and improved stiffness were further confirmed through hammer-impact tests (vibration and noise measurement tests) in order to prove the efficacy of the composite remodeling.

scholarly journals ASSESSMENT OF TRAFFIC LOAD EVENTS AND STRUCTURAL EFFECTS ON ROAD BRIDGES BASED ON STRAIN MEASUREMENTS

2015 ◽  
Vol 22 (4) ◽  
pp. 457-469 ◽  
Author(s):  
Helder SOUSA ◽  
Bruno J. A. COSTA ◽  
António Abel HENRIQUES ◽  
João BENTO ◽  
Joaquim A. FIGUEIRAS
Keyword(s):  
Probabilistic Approach ◽  
Critical Issue ◽  
Distribution Functions ◽  
Traffic Load ◽  
Scientific Publications ◽  
Railway Bridges ◽  
Traffic Loads ◽  
Extreme Distribution ◽  
Optical Strain ◽  
Observation Period

Several technical and scientific publications have been made available focussing on Bridge Weight-in-Motion (BWIM) concerning railway bridges. On the contrary, BWIM analysis on road bridges are more scarce and therefore, this work intends to provide a contribution by presenting the BWIM analysis performed on two major road bridges in Portugal – Lezíria Bridge and Pinhão Bridge. These bridges are equipped with electric and optical strain gauges, acquisi­tion systems with features that allow high sampling rates. Based on the collected data and focussing on the bridges’ life­time, a probabilistic approach to quantify extreme traffic loads was implemented using extreme distribution functions. The bridges’ behaviour to these extreme traffic loads is numerically evaluated and a comparison with the alarm levels established by the bridge designers is performed. Although the bridge’s safety is not compromised, it was concluded that the representativeness of the observation period is a critical issue and the analysis of this kind of results must be care­fully considered. A comprehensive discussion about this matter is carried out at the end of this work.

16.11: Experimental tests on the fatigue behaviour of thick-plate trough railway bridges

ce/papers ◽  
2017 ◽  
Vol 1 (2-3) ◽  
pp. 4123-4132
Author(s):  
Stephanie Breunig ◽  
Ulrike Kuhlmann
Keyword(s):  
Thick Plate ◽  
Experimental Tests ◽  
Fatigue Behaviour ◽  
Railway Bridges

Optimization of stiffened plates for steel bridges based on Eurocode 3 Part 1-5 using genetic algorithms

2011 ◽  
Vol 4 (1) ◽  
pp. 29-33
Author(s):  
Martin Mensinger ◽  
Joseph Ndogmo ◽  
Ricardo Parra
Keyword(s):  
Genetic Algorithms ◽  
Steel Bridges ◽  
Stiffened Plates ◽  
Eurocode 3

scholarly journals ANALYSIS OF DIAPHRAGM BEHAVIOUR IN COMPOSITE MULTI GIRDER RAILWAY BRIDGES

2004 ◽  
Vol 10 (2) ◽  
pp. 143-150
Author(s):  
Yannick Sieffert ◽  
Gérard Michel ◽  
Didier Martin ◽  
David Keller ◽  
Jean-François Jullien
Keyword(s):  
Bridge Deck ◽  
Element Model ◽  
Longitudinal Distribution ◽  
Railway Bridge ◽  
Railway Bridges ◽  
Traffic Loads ◽  
Concrete Bridge Deck ◽  
Actual Geometry ◽  
Static Failure ◽  
Concrete Deck

This study focuses on mechanical behaviour of diaphragm in composite multigirders railway bridge. The aim is to predict and to compare, with a numerical simulation, the transverse and longitudinal distribution of traffic loads in different girders and in the slab for the cases with and without intermediary diaphragm. A 3‐D finite element model is developed to represent the actual geometry of multigirder bridge. Durability of the concrete bridge deck is directly related to cracking, so a non‐linear constitutive equation is used for the concrete deck. This study focuses on the response of a bridge with and without dipahragm under a UIC and TGV loading. To achieve this aim, a static failure analysis is performed. Our analysis concluded that diaphragm is not necessary, so it seems to be possible to remove the diaphragms.

Research on Construction Informatization of Railway Steel Bridge Based on BIM in China

2019 ◽  
Author(s):  
Xiaoguang Liu ◽  
Yongjie Pan ◽  
Xinxin Zhao
Keyword(s):  
High Speed ◽  
Intelligent Manufacturing ◽  
Steel Bridges ◽  
Future Application ◽  
Significant Feature ◽  
Steel Bridge ◽  
Bridge Construction ◽  
Railway Bridges ◽  
Virtual Reconstruction ◽  
The Internet Of Things

<p>The construction informatization of railway bridges is becoming a significant feature of “intelligent manufacturing" in China's high speed railway (HSR). In order to explore the implementation of “Internet plus steel bridge construction" and further improve the quality and efficiency of construction, digitization and informatization of steel bridge construction have been studied. The overall framework of digital construction of railway steel bridge construction based on the internet of things (IoT) and BIM technology is proposed after analyzing the key process of quality control during the construction of railway steel bridge. And then the virtual reconstruction of railway steel bridge is presented based on the advanced digital technology. Taking the pre-assembly in fabrication stage and the bolted connection in erection stage of steel bridges as two representative examples, the virtual reconstruction information system has been developed and tested in some HSR railway bridge projects in China, which verifies the feasibility and efficiency of digital control virtual reconstruction strategy. The research is meaningful to the future application and development in intelligent construction of railway steel bridges.</p>

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