TY  - THES
A1  - Rahn, Andre
T1  - "Monitoring an Brückenkappen mit Tellerankern"
T1  - Monitoring at bridge caps with plate anchors
N2  - Brückenkappen gewährleisten die Trennung der Verkehrsräume Fahrbahn und Gehweg und müssen aufgrund ihrer Anordnung im Querschnitt Schutz- und Leiteinrichtungen aufnehmen. Zur Verankerung der Brückenkappen am Überbau werden je nach Erfordernissen Anschlussbewehrung und / oder Telleranker angeordnet. Die vorliegende Arbeit analysiert grundlegende Möglichkeiten zur messtechnischen Untersuchung von Brückenkappen bei Anwendung von Tellerankern. Dabei werden die theoretische und konstruktiven Grundlagen der Kappenausbildung betrachtet. Außerdem werden die Zusammenhänge zwischen den auftretenden Einwirkungen und deren Auswirkungen auf Brückenkappen betrachtet. Darauf aufbauend werden Kennwerte zur Ermittlung der Beanspruchung in den Kappen und den Tellerankern abgeleitet und hinsichtlich der messtechnischen Erfassung und Auswertung der Messdaten analysiert.
N2  - Bridge caps ensure the separation of the traffic areas to roadway and sidewalk and must take up protection and guidance establishments. For the anchorage of the bridge caps at the superstructure depending on the requirements connection armouring and/or plate anchors are arranged. The present work analyses fundamental possibilities for the instrumentation examination of bridge caps with use of plate anchors. The theoretical and constructive bases of the cap design are regarded. In addition the connections between the occurring effects and their consequences for bridge caps are regarded. Characteristic values are derived into the ascertainment of the strain in the caps and the plate anchors and are analysed regarding the instrumentation collection and evaluation of the measuring data.
KW  - Brücke
KW  - Monitoring
KW  - Ingenieurbau
KW  - Anker <Bauwesen>
KW  - Dehnung
KW  - Dehnungsmessung
KW  - Brückenbau
KW  - Telleranker
Y1  - 2007
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20080307-13431
ER  - 
TY  - CHAP
A1  - Schneider, Lothar
T1  - Abbruch der Teufelstalbrücke – Herausforderungen mit Risiko
N2  - Anlass zum Abriss der Brücke; Das abzubrechende Bauwerk; Vorgaben für den Abbruch (gemäß der Ausschreibung, aus statischer Sicht, aus Arbeitsschutzgründen); Abbruch der Aufbauten und der Fahrbahnplatte (Abbruch der Aufbauten, Problem Festpunkt Bogenscheitel – Fahrbahn, Abbruch Plattenbalken und Pfeilerscheiben); Abbruch der Bögen (Abbruchgerüst, Scheitelöffnung, Bogenrückbau, Kontrollsystem). Noch nie zuvor war in Deutschland eine Bogenbrücke auf diese Art und Weise abgebrochen worden. Maßgeblich für das Gelingen des schwierigen Rückbaus der Teufelstalbrücke war das Verantwortungsbewusstsein der Beteiligten im Zusammenhang mit der notwendigen Risikobereitschaft, aber auch mit der Vermeidung unnötiger Restrisiken schon von vornherein. Zur Risikominimierung trugen die gute Organisation des Vorhabens, regelmäßige gemeinsame Baustellenbegehungen mit Vertretern der für Sicherheit zuständigen Institutionen (Amt für Arbeitsschutz Gera, Bau-Berufsgenossenschaft, Sicher-heits- und Gesundheitsschutzkoordinator) sowie die technische Ausstattung bei. All dies führte letztendlich zum Erfolg einer Maßnahme, bei der man den bisherigen Erfahrungsbereich verlassen musste.
KW  - Arbeitsschutz
KW  - Baustelle
KW  - Baubetriebslehre
KW  - Abbruch
KW  - Brückenbau
Y1  - 2003
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-4722
ER  - 
TY  - THES
A1  - Beer, Enia
T1  - Analyse der Tragfähigkeit und Dauerhaftigkeit bestehender Spannbetonbrücken
T1  - Bearing capacity and durability analysis of existing prestressed concrete bridges
N2  - Es wird die Geschichte des Spannbetons im Brückenbau wiedergegeben. Hierzu wird unter anderem ein Normenvergleich zum Thema Spannbeton aufgestellt. Desweiteren wird erläutert, was die Grundlagen für die Nachrechnung bestehender Brücken sind. Für die Brücke über die Saale bei Jena-Kunitz wird ein Beprobungskonzept mit zerstörenden Prüfungen erstellt. Die erhaltenen Proben sollen in Labortests weiter untersucht werden. Die durch die Beprobung entstehenden Schädigungen sollen zu weiteren Messungen an der Brücke genutzt werden. Die Schädigungszustände werden statisch nachgewiesen. Zum Schluss werden Hinweise für den geplanten Abriss der Brücke gegeben.
N2  - The history of the prestressed concrete building is reflected in the field of bridge building. A norm comparison for the theme of prestressed concrete is made for this. The basics of recalculation of bridges are elucidated. A concept for samples with destructive tryouts is made for the bridge over the river Saale near Jena-Kunitz. These samples are appointed to be tested in a laboratory. The damages made for the samples shall be used for further measurements on the bridge. The damaged states are structurally verified. At the end there are suggestions for the break down of the bridge.
KW  - Spannbeton
KW  - Brückenbau
KW  - Tragfähigkeit
KW  - zerstörende Prüfungen
KW  - destrutive tryouts
Y1  - 2008
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20080520-13620
ER  - 
TY  - THES
A1  - Simon, Antje
T1  - Analyse zum Trag- und Verformungsverhalten von Straßenbrücken in Holz-Beton-Verbundbauweise
T1  - Load-bearing and deformation performance of road bridges as timber-concrete composites
N2  - Ziel der Arbeit ist es, einen Beitrag zur Weiterentwicklung und Adaption der Holz-Beton-Verbundbauweise auf den Straßenbrückenbau zu leisten. Dabei stehen differenzierte Untersuchungen zum Trag- und Verformungsverhalten hybrider Holzbrückentragwerke sowie die Entwicklung geeigneter Verbundelemente im Vordergrund. Um die Einführung dieser innovativen Bauweise in der Praxis zu unterstützen, werden Bemessungs- und Konstruktionshinweise erarbeitet. Aufbauend auf eine Analyse des derzeitigen Forschungs- und Entwicklungsstandes auf dem Gebiet des Holz-Beton-Verbundbaus erfolgt die Untersuchung des Trag- und Verformungsverhaltens von Holz-Beton-Verbundbrücken anhand einer umfangreichen Parameterstudie. Dabei wird der Einfluss verschiedener Geometrie- und Steifigkeitsparameter auf die Tragfähigkeit und Gebrauchstauglichkeit von Holz-Beton-Verbundbrücken quantifiziert. Spezielle Untersuchungen dienen der Evaluation der Ermüdungssicherheit und der Ermittlung der Steifigkeitsdegradation unter Langzeitbeanspruchung auf der Basis einer realitätsnahen Abbildung des differenten zeit- und klimaabhängigen Tragverhaltens der Verbundbaustoffe. Praxisgerechte Empfehlungen für die optimierte konstruktive Durchbildung hybrider Holzbrückentragwerke fassen die Ergebnisse der Parameterstudie zusammen. Aus den Parameteranalysen leitet sich ein Anforderungsprofil bezüglich der Steifigkeit und Tragfähigkeit geeigneter Verbundelemente für den Straßenbrückenbau ab. Das Tragverhalten von drei ausgewählten Verbundelementtypen, welche diesem Profil entsprechen, wird anhand systematischer Scherversuche unter Kurzzeit-, Langzeit- und dynamischer Belastung analysiert. Aufbauend auf diese Testreihen werden weiterführende umfangreiche Versuchsserien mit dem Verbundelement Dübelleiste zur Bestimmung der mechanischen Kennwerte und zur Analyse des Gesamttragverhaltens vorgestellt. In Auswertung der umfangreichen Bauteilversuche und rechnerischer Simulationen auf der Basis Finiter-Elemente-Modelle wird ein Bemessungskonzept erarbeitet und die Eignung des Verbundelementes Dübelleiste für den Einsatz im Hybridbrückenbau nachgewiesen.
N2  - The dissertations aim is to develop the construction of road bridges using timber-concrete composites. In the foreground it is necessary to investigate the load-bearing and deformation performance of hybrid timber bridges and to develop suitable joints for bridge building. Construction and design details are developed to improve the initiation of this innovative building method in practice. First the present research and development status in the fields of timber-concrete composites is analysed. On the basis of this analysis a comprehensive parametrical study is used to investigate the load-bearing and deformation performance of hybrid timber bridges. Thereby, the influence of different geometrical and stiffness parameters on the ultimate limit state and on the serviceability of these bridges is quantified. Special investigations evaluating the fatigue behaviour are presented. Also the long-time performance is analysed using a realistic description of the different time- and climatic dependent behaviour of the bonding materials. Practical references for the optimised construction of hybrid timber bridges summarise the results of the parametrical study. On the basis of the study, a requirement profile is defined for the stiffness and ultimate load of suitable connectors for building road bridges. The load-bearing performance of three different connector types fitting this profile is analysed by systematic shear tests under short-time, long-time, and dynamic loading. Continuative tests with the stud joint having been done to determine the mechanical values and to investigate the total load-bearing performance are presented. Analysing these comprehensive tests and FE-simulations of the tests a design concept is developed. So the suitability of the stud joint is verified for the usage in hybrid timber road bridges.
T3  - Schriftenreihe des Instituts für Konstruktiven Ingenieurbau - 16 
KW  - Hybridbauweise
KW  - Brückenbau
KW  - Straßenbrücke
KW  - Holzbau
KW  - Verbundbauweise
KW  - Materialermüdung
KW  - Holz-Beton-Verbund
KW  - Parameteranalyse
KW  - Langzeittragverhalten
KW  - Verbundmittel
KW  - Dübelleiste
KW  - timber-concrete composite
KW  - road bridge
KW  - long-time-performance
KW  - fatigue
KW  - connector
Y1  - 2008
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20081022-14216
N1  - Die gedruckte Ausgabe ist im Universitätsverlag der Bauhaus-Universität Weimar erschienen, seit 2014 Bauhaus-Universitätsverlag Weimar.
ER  - 
TY  - THES
A1  - Heidenreich, Christian
T1  - Bewertung von Verbundbrückensystemen nach der Effizienzwertmethode
T1  - Assessment of Composite Bridge Structures with Efficiency Indicator Method
N2  - Der Einsatz von Glasfaserverstärkten Kunststoffen im Verbundbrückenbau wurde überprüft. Hierzu wurden Vergleichsbrücken in Stahl / Beton und GFK / Beton entwickelt und vergleichend überprüft. Im Vergleich wurden nicht nur die Kriterien der Tragfähigkeit und Gebrauchstauglichkeit sondern auch ökonomisch günstige sowie ökologisch vertretbare Faktoren betrachtet. Der Vergleich der Bauweisen wird anhand der Effizienzwertmethode (EWM) durchgeführt, welche an der Bauhaus ? Universität Weimar von Dr. Derek Eisert entwickelt wurde. Mit Hilfe der EWM ist es möglich ganzheitliche und nachhaltige Bewertungen durchzuführen. Im Rahmen der Anwendung der EWM war vor allem die Überprüfung des Kriterienkataloges im Hinblick auf die Anwendbarkeit bei Verbundbrücken ein Ziel dieser Arbeit. Um eine exakte Bewertung durchführen zu können ist es notwendig exakte Beiwerte für die einzelnen Kriterien (Tragen, Gebrauchen, Erleben, Ökonomie und Ökologie) zu ermitteln. Hierzu sind entsprechende Grundlagen und Recherchequellen aufgezeigt.
N2  - The application of glass fibre reinforced plastics for composite bridge structures is assessed. For this purpose, examplary bridges in steel / concrete and FRP / concrete were designed. For the comparison, not only the ultimate limit state and serviceability are important, but as well the look on economical and ecological criteria. For the comparison the efficiency indicator method (EIM) is used. This method was developed at the Bauhaus ? University Weimar by Dr. Derek Eisert. For using the EIM it is possible to evaluate the bridges under multiple criteria, among them also sustainability. One major task of the work is to scrutinise the criteria catalogue for the evaluation of composite bridges. To get exact results of the evaluation it is necessary to know the coefficients (bearing, using, experience, economy and ecology) very well. Theoretical basics and sources for further research are shown.
KW  - Glasfaserverstärkter Kunststoff
KW  - Effizienz
KW  - Brückenbau
KW  - Verbundbauweise
KW  - Effizienzwertmethode
KW  - Verbundbrückenkonstruktionen
KW  - FOMEKK
KW  - efficiency indicator method
KW  - composite bridge structures
KW  - assessment methods
KW  - glass fibre reinforced plastics
Y1  - 2005
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-4130
N1  - Der Volltext-Zugang wurde im Zusammenhang mit der Klärung urheberrechtlicher Fragen mit sofortiger Wirkung gesperrt.
ER  - 
TY  - CHAP
A1  - Cheung, Moe M. S.
A1  - Noruziaan, Bahman
A1  - Li, W. C.
T1  - Data acquisition, processing and management systems for a Canadian bridge monitoring project
N2  - This paper will present a number of technical aspects for one of the most elaborate instrumentation and data acquisition projects ever undertaken in Canada. Confederation Bridge, the longest bridge built over ice covered seawater has been equipped with the state of the art data acquistition devices and systems as well as data transfer networks. The Bridge has been providing a fixed surface connection between Prince Edward Island and Province of New Brunswick in Canada since its opening in 1997. The Bridge has a rather long design service life of 100 years. Because of its large size and long span length, its design is not covered by any existing codes or standards worldwide. The focus of the paper is to introduce the data acquisition, transfer, processing and management systems. The instrumentation and communications infrastructure and devices will be presented in some details along with the data processing and management systems and techniques. Teams of engineers and researchers use the collected data to verify the analysis and design assumptions and parameters as well as investigate the short-term and long-term behaviour and health of the Bridge. The collected data are also used in furthering research activities in the field of bridge engineering and in elevating our knowledge about behaviour, reliability and durability of such complex structures, their components and materials.
KW  - Bauwerk
KW  - Datenmanagement
KW  - Brückenbau
Y1  - 2004
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-1235
ER  - 
TY  - CHAP
A1  - Sampaio, Alcinia Zita
T1  - Definition of a bridge deck geometrical modelling process to automate design graphical representations
N2  - The construction of a new building interferes with the existent environment. A careful aesthetic study must be made at an early stage in the design and the visualization of a three-dimensional (3D) model of the structure is the best way to analyse it. As some structures presents a complex shape is difficult to execute a 3D model as well as the specific drawings. Using traditional graphical systems, the execution of deck specific drawings is extremely time consuming and the 3D deck model gives an approximation only of the exterior shape of the deck. The modelling scheme proposed here allows the automation of the geometric design phases related to the deck bridge element using as a means of integration a geometric database representative of the real deck shape. This concept was implemented in a computer program. This application is an important support in the process design namely at the conceptual and graphical stages. The computer application provides an important tool to the bridge designer particularly at the conceptual stage, as it allows aesthetic and structural evaluation of the bridge at an early stage in the design. The geometric modelling process and graphical results of a case study are presented.
KW  - Brückenbau
KW  - CAD
KW  - Dreidimensionales Modell
Y1  - 2003
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-3575
ER  - 
TY  - THES
A1  - Georgi, Sven
T1  - Druckstauchungsverhalten bewehrter Elastomerlager
N2  - Innerhalb der Arbeit wurden vorliegende Druckversuche an bewehrten Elastomerlagern hinsichtlich des Druckstauchungsverhaltens systematisch ausgewertet. Die Druckversuche wurden an Lagern verschiedener Hersteller durchgeführt. Die Versuchsdurchführung und Auswertung erfolgte nach DIN 4141-140 bzw. nach EN 1337-3. Die ermittelten Druckstauchungswerte in Form des ideellen E-Moduls wurden anschließend den vereinfachten Berechnungsansätzen der Normen DIN 4141-14/A1 und EN 1337-3, sowie den Berechnungsansätzen nach Topaloff gegenüber gestellt. Als Nebenaspekt der Arbeit wurde eine am Lehrstuhl vorliegende Versuchsdatenbank auf ihre Eignung und Funktionalität untersucht.
KW  - Lager <Bauwesen>
KW  - Brückenbau
KW  - Stauchung
KW  - Elastomerlager
KW  - DIN 4141/14
KW  - EN 1337/3
Y1  - 2005
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-6616
N1  - Der Volltext-Zugang wurde im Zusammenhang mit der Klärung urheberrechtlicher Fragen mit sofortiger Wirkung gesperrt.
ER  - 
TY  - THES
A1  - Ullrich, Carmen
T1  - Dynamische Analyse der Sprottetalbrücke
N2  - Die vorliegende Arbeit beschäftigt sich mit der dynamischen Analyse der Sprottetalbrücke infolge aufgetretener Asphaltschäden. Sie beinhaltet die Erstellung eines FE-Modells, der Darstellung der theoretischen Grundlagen der Dynamik sowie die Auswertung von berechneten Eigenformen und Asphaltspannungen unter Berücksichtigung der derzeit gültigen Normen.
N2  - The diploma thesis contains the dynamic analysis of the roadwaybridge >Sprottetalbrücke< with modelling a FE-structure, presents the principle basics of the dynamic and interprets the results in consider of the presently available regulations in germany.
KW  - Finite-Elemente-Methode
KW  - Dynamik
KW  - Brückenbau
KW  - Dynamische Analyse
KW  - Modale Analyse
KW  - Straßenbrücken
KW  - Sprottetal
KW  - Sprottetalbrücke
KW  - Tragrostbrücke
KW  - Überfahrt
KW  - Slang
KW  - Asphalt
KW  - Lastwechselzahl
Y1  - 2005
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-7268
N1  - Der Volltext-Zugang wurde im Zusammenhang mit der Klärung urheberrechtlicher Fragen mit sofortiger Wirkung gesperrt.
ER  - 
TY  - CHAP
A1  - Jian Ming, Lu
A1  - Ke, Chen
T1  - Information technology used in highway and bridge engineering
N2  - With the speedy development of transportation of China, especially construction of many high-grade highways, some information technology successes have been achieved in the highway and bridge engineering, such as survey, design, construction and maintenance etc. In this paper, some applications about information technology in the highway engineering were introduced and some bridge professional software developed by RIOH (Research Institute Of Highways) in recent years was also introduced.
KW  - Mobile Computing
KW  - Funknetz
KW  - Straßenbau
KW  - Brückenbau
Y1  - 2004
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-1114
ER  - 
TY  - JOUR
A1  - Galffy, Mozes
A1  - Wellmann Jelic, Andres
A1  - Hartmann, Dietrich
T1  - Lifetime-oriented modelling of vortex-induced across-wind vibrations on bridge tie rods
N2  - The influence of vortex-induces vibrations on vertical tie rods has been proved as a determinant load factor in the lifetime-oriented dimensioning of arched steel bridges. Particularly, the welded connection plates between the suspenders and the arches often exhibit cracks induced primarily rods. In this context, the synchronization of the vortex-shedding to the rod motion in a critical wind velocity range, the so-called lock-in effect, is of essential interest.
KW  - Finite-Elemente-Methode
KW  - Physikalisches Verfahren
KW  - Brückenbau
KW  - Schwingung
Y1  - 2004
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-2536
ER  - 
TY  - CHAP
A1  - Hörnig, Wolfgang
T1  - Moderne Fertigungsmethoden im Brückenbau am Beispiel der Bogenherstellung über die Wilde Gera
N2  - Es werden die Erfahrungen der Adam Hörnig Baugesellschaft bei der Bogenherstellung im Freivorbau einer Autobahnbrücke beschrieben.
KW  - Baustelle
KW  - Brückenbau
KW  - Freivorbau
Y1  - 2000
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-6994
ER  - 
TY  - CHAP
A1  - Melhem, Hani
A1  - Cheng, Yousheng
T1  - Numeric Prediction Algorithms for Bridge Corrosion
N2  - The research reported in this article was conducted to mainly explore the two common numeric prediction techniques, the model tree and the regression tree, when used in conjunction with bagging as a wrapper method. Bagging is used to improve the prediction accuracy of these two algorithms, and results are compared with the ones obtained earlier by the k-nearest neighbor (KNN) algorithm. From the conducted experiments, both the bagged regression tree and bagged model tree produce better results than not only their corresponding regression tree and model tree alone, but also the KNN with optimal value of k equal to 7. In addition, the bagged model tree yields the lowest prediction errors and a highest correlation coefficient of 0.81. It is demonstrated that it is feasible to use the bagged model tree for engineering applications in prediction problems such as estimating the remaining service life of bridge decks.
KW  - Hochschulbildung
KW  - Entscheidungsunterstützung
KW  - Brückenbau
KW  - Korrosion
KW  - Prognose
Y1  - 2004
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-1982
ER  - 
TY  - THES
A1  - Nariman, Nazim
T1  - Numerical Methods for the Multi-Physical Analysis of Long Span Cable-Stayed Bridges
N2  - The main categories of wind effects on long span bridge decks are buffeting, flutter, vortex-induced vibrations (VIV) which are often critical for the safety and serviceability of the structure. With the rapid increase of bridge spans, research on controlling wind-induced vibrations of long span bridges has been a problem of great concern.The developments of vibration control theories have led to the wide use of tuned mass dampers (TMDs) which has been proven to be effective for suppressing these vibrations both analytically and experimentally. Fire incidents are also of special interest in the stability and safety of long span bridges due to significant role of the complex phenomenon through triple interaction between the deck with the incoming wind flow and the thermal boundary of the surrounding air.
This work begins with analyzing the buffeting response and flutter instability of three dimensional computational structural dynamics (CSD) models of a cable stayed bridge due to strong wind excitations using ABAQUS finite element commercial software. Optimization and global sensitivity analysis are utilized to target the vertical and torsional vibrations of the segmental deck through considering three aerodynamic parameters (wind attack angle, deck streamlined length and viscous damping of the stay cables). The numerical simulations results in conjunction with the frequency analysis results emphasized the existence of these vibrations and further theoretical studies are possible with a high level of accuracy. Model validation is performed by comparing the results of lift and moment coefficients between the created CSD models and two benchmarks from the literature (flat plate theory) and flat plate by (Xavier and co-authors) which resulted in very good agreements between them. Optimum values of the parameters have been identified. Global sensitivity analysis based on Monte Carlo sampling method was utilized to formulate the surrogate models and calculate the sensitivity indices. The rational effect and the role of each parameter on the aerodynamic stability of the structure were calculated and efficient insight has been constructed for the stability of the long span bridge.
2D computational fluid dynamics (CFD) models of the decks are created with the support of MATLAB codes to simulate and analyze the vortex shedding and VIV of the deck. Three aerodynamic parameters (wind speed, deck streamlined length and dynamic viscosity of the air) are dedicated to study their effects on the kinetic energy of the system and the vortices shapes and patterns. Two benchmarks from the literature (Von Karman) and (Dyrbye and Hansen) are used to validate the numerical simulations of the vortex shedding for the CFD models. A good consent between the results was detected. Latin hypercube experimental
method is dedicated to generate the surrogate models for the kinetic energy of the system and the generated lift forces. Variance based sensitivity analysis is utilized to calculate the main sensitivity indices and the interaction orders for each parameter. The kinetic energy approach performed very well in revealing the rational effect and the role of each parameter in the generation of vortex shedding and predicting the early VIV and the critical wind speed.
Both one-way fluid-structure interaction (one-way FSI) simulations and two-way fluid-structure interaction (two-way FSI) co-simulations for the 2D models of the deck are executed to calculate the shedding frequencies for the associated wind speeds in the lock-in region in addition to the lift and drag coefficients. Validation is executed with the results of (Simiu and Scanlan) and the results of flat plate theory compiled by (Munson and co-authors) respectively. High levels of agreements between all the results were detected. A decrease in the critical wind speed and the shedding frequencies considering (two-way FSI) was identified compared to those obtained in the (one-way FSI). The results from the (two-way FSI) approach predicted appreciable decrease in the lift and drag forces as well as prediction of earlier VIV for lower critical wind speeds and lock-in regions which exist at lower natural frequencies of the system. These conclusions help the designers to efficiently plan and consider for the design and safety of the long span bridge before and after construction.
Multiple tuned mass dampers (MTMDs) system has been applied in the three dimensional CSD models of the cable stayed bridge to analyze their control efficiency in suppressing both wind -induced vertical and torsional vibrations of the deck by optimizing three design parameters (mass ratio, frequency ratio and damping ratio) for the (TMDs) supporting on actual field data and minimax optimization technique in addition to MATLAB codes and Fast Fourier Transform technique. The optimum values of each parameter were identified and validated with two benchmarks from the literature, first with (Wang and co-authors) and then with (Lin and co-authors). The validation procedure detected a good agreement between the results. Box-Behnken experimental method is dedicated to formulate the surrogate models to represent the control efficiency of the vertical and torsional vibrations. Sobol's sensitivity indices are calculated for the design parameters in addition to their interaction orders. The optimization results revealed better performance of the MTMDs in controlling both the vertical and the torsional vibrations for higher mode shapes. Furthermore, the calculated rational effect of each design parameter facilitates to increase the control efficiency of the MTMDs in conjunction with the support of the surrogate models which simplifies the process of analysis for vibration control to a great extent.
A novel structural modification approach has been adopted to eliminate the early coupling between the bending and torsional mode shapes of the cable stayed bridge. Two lateral steel
beams are added to the middle span of the structure. Frequency analysis is dedicated to obtain the natural frequencies of the first eight mode shapes of vibrations before and after the structural modification. Numerical simulations of wind excitations are conducted for the 3D model of the cable stayed bridge. Both vertical and torsional displacements are calculated at the mid span of the deck to analyze the bending and the torsional stiffness of the system before and after the structural modification. The results of the frequency analysis after applying lateral steel beams declared that the coupling between the vertical and torsional mode shapes of vibrations has been removed to larger natural frequencies magnitudes and higher rare critical wind speeds with a high factor of safety.
Finally, thermal fluid-structure interaction (TFSI) and coupled thermal-stress analysis are utilized to identify the effects of transient and steady state heat-transfer on the VIV and fatigue of the deck due to fire incidents. Numerical simulations of TFSI models of the deck are dedicated to calculate the lift and drag forces in addition to determining the lock-in regions once using FSI models and another using TFSI models. Vorticity and thermal fields of three fire scenarios are simulated and analyzed. The benchmark of (Simiu and Scanlan) is used to validate the TFSI models, where a good agreement was manifested between the two results. Extended finite element method (XFEM) is adopted to create 3D models of the cable stayed bridge to simulate the fatigue of the deck considering three fire scenarios. The benchmark of (Choi and Shin) is used to validate the damaged models of the deck in which a good coincide was seen between them. The results revealed that the TFSI models and the coupled thermal-stress models are significant in detecting earlier vortex induced vibration and lock-in regions in addition to predicting damages and fatigue of the deck and identifying the role of wind-induced vibrations in speeding up the damage generation and the collapse of the structure in critical situations.
KW  - Stabilität
KW  - Brückenbau
KW  - Aerodynamic Stability
KW  - Vortex Induced Vibration
KW  - Fluid-Structure Interaction
KW  - Mass Tuned Damper
KW  - Thermal Fluid-Structure Interaction
Y1  - 2017
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20171122-37105
ER  - 
TY  - THES
A1  - Fröhlich, Jan
T1  - On systematic approaches for interpreted information transfer of inspection data from bridge models to structural analysis
N2  - In conjunction with the improved methods of monitoring damage and degradation processes, the interest in reliability assessment of reinforced concrete bridges is increasing in recent years. Automated imagebased inspections of the structural surface provide valuable data to extract quantitative information about deteriorations, such as crack patterns. However, the knowledge gain results from processing this information in a structural context, i.e. relating the damage artifacts to building components. This way, transformation to structural analysis is enabled. This approach sets two further requirements: availability of structural bridge information and a standardized storage for interoperability with subsequent analysis tools. Since the involved large datasets are only efficiently processed in an automated manner, the implementation of the complete workflow from damage and building data to structural analysis is targeted in this work. First, domain concepts are derived from the back-end tasks: structural analysis, damage modeling, and life-cycle assessment. The common interoperability format, the Industry Foundation Class (IFC), and processes in these domains are further assessed. The need for usercontrolled interpretation steps is identified and the developed prototype thus allows interaction at subsequent model stages. The latter has the advantage that interpretation steps can be individually separated into either a structural analysis or a damage information model or a combination of both. This approach to damage information processing from the perspective of structural analysis is then validated in different case studies.
KW  - Brückenbau
KW  - Strukturanalyse
KW  - Schadensanalyse
KW  - BIM
KW  - IFC
KW  - bridge inspection
KW  - damage information model
KW  - structural analysis
KW  - IFC
KW  - BIM
Y1  - 2020
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20200416-41310
ER  - 
TY  - JOUR
A1  - Ke, Chen
A1  - Jian Ming, Lu
T1  - Study of Analysis System for Bridge Test
N2  - Analysis System for Bridge Test (Chinese name abbr.: QLJC) is an application software specially designed for bridge test to analyze the static and dynamic character of bridge structures, calculate efficiency ratio of load test, pick up the results of observation points and so on. In this paper, research content, system design, calculation theory, characteristics and practical application of QLJC is introduced in detail.
KW  - Finite-Elemente-Methode
KW  - Physikalisches Verfahren
KW  - Brückenbau
KW  - Straßenbrücke
Y1  - 2004
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:gbv:wim2-20111215-2547
ER  -