Relevant bibliographies by topics / Post-tensioned concrete bridges

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  2. Dissertations / Theses
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Academic literature on the topic 'Post-tensioned concrete bridges'

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Published: 4 June 2021
Last updated: 6 February 2022

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Journal articles on the topic "Post-tensioned concrete bridges"

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Scollard, C. R., and F. M. Bartlett. "Rehabilitation criteria for post-tensioned voided-slab bridges." Canadian Journal of Civil Engineering 31, no. 6 (December 1, 2004): 977–87. http://dx.doi.org/10.1139/l04-057.

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Current rehabilitation practices for aging, post-tensioned, voided-slab bridges typically reduce the geometric properties of the concrete cross section and so permanently increase post-tensioning stresses, change primary and secondary prestress moments, and create new primary and secondary moments because the original concrete restrains shrinkage of the new concrete. These changes affect the resistance of the rehabilitated bridge at limit states specified for new construction in the Canadian Highway Bridge Design Code (CHBDC) and may cause other limit states not currently identified in the CHBDC to govern. Rehabilitation schemes should be checked for a serviceability limit state of tensile stresses due to permanent service loads that exceed the cracking strength of the original concrete, which is typically not detailed to control crack widths. Ultimate limit states to check are (i) flexural resistance over interior supports, where the total factored demand can be increased markedly by the rehabilitation; and (ii) creep-initiated failure of concrete due to permanent compressive stresses. The application of these procedures is illustrated through example calculations for a typical continuous bridge.Key words: post-tensioned concrete, serviceability, ultimate limit state, restrained shrinkage, secondary prestress moments, critical stress, cracking.
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Abdelatif, Amged O., John S. Owen, and Mohammed F. M. Hussein. "Re-Anchorage of a Ruptured Tendon in Bonded Post-Tensioned Concrete Beams: Model Validation." Key Engineering Materials 569-570 (July 2013): 302–9. http://dx.doi.org/10.4028/www.scientific.net/kem.569-570.302.

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Many post-tensioned concrete bridges have been reported to have ruptured tendons due to corrosion [1] and the assessment of their residual structural capacity has to account for the possibility of re-anchorage of failed tendons. This paper presents an experimental programme to validate a numerical model developed by the authors for the re-anchorage of a ruptured tendon in post-tensioned concrete [2]. The experimental programme considered 33 post-tensioned concrete prisms, in which the rupture of tendon was simulated by releasing the tendon at one end. The full field displacement at concrete surface after release was measured using 3D Electronic Speckle Pattern Interferometry (ESPI). A wide range of parameters: tendon diameter, duct material, grout strength, concrete strength and shear reinforcement were investigated to validate the proposed model, which is found to be suitable for use in assessing post-tensioned concrete bridges with damaged tendons.
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Riddle, John. "Safe demolition of post-tensioned reinforced concrete bridges." Proceedings of the Institution of Civil Engineers - Civil Engineering 171, no. 4 (November 2018): 150. http://dx.doi.org/10.1680/jcien.2018.171.4.150.

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Wenzel, Helmut, and Robert VEIT-Egerer. "Quantification of remaining Lifetime of post-tensioned Concrete Bridges." IABSE Symposium Report 97, no. 14 (January 1, 2010): 33–39. http://dx.doi.org/10.2749/222137810796062905.

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Cullington, D. W., D. MacNeil, P. Paulson, and J. Elliott. "Continuous acoustic monitoring of grouted post-tensioned concrete bridges." NDT & E International 34, no. 2 (March 2001): 95–105. http://dx.doi.org/10.1016/s0963-8695(00)00034-7.

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Markus, Luca, and Paul Gauvreau. "Qualitative Measure of Efficiency of Post-Tensioned Concrete Bridges." Journal of Bridge Engineering 25, no. 7 (July 2020): 04020036. http://dx.doi.org/10.1061/(asce)be.1943-5592.0001568.

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Breen, John E. "Techniques for Improving Durability of Post-Tensioned Concrete Bridges." Arabian Journal for Science and Engineering 37, no. 2 (February 2, 2012): 303–14. http://dx.doi.org/10.1007/s13369-012-0184-7.

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Youn, Seok Goo, S. K. Cho, and Eun Kyum Kim. "Acoustic Emission Technique for Detection of Corrosion-Induced Wire Fracture." Key Engineering Materials 297-300 (November 2005): 2040–45. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.2040.

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There is currently a need to evaluate the non-destructive techniques that are used to detect the fracture of stressed steel wires in grouted post-tensioned concrete bridges. Although continuous acoustic emission (AE) monitoring technique has been developed to detect wire breaks in unbonded tendons, it is not established as the on-site monitoring tools for grouted post-tensioned concrete bridges. In this study, AE measurements were conducted to detect corrosion-induced wire fractures inside a grouted post-tensioned beam. The test beam was drilled with 5mm drill bit to expose individual wires and a reservoir filled with corrosive solution of NaCl and NaOH was formed on the side of the beam. During the experiment, the corrosion site was anodically polarized to + 200mV using a potentiostat and it was continuously monitored and the data obtained were processed with an AE monitoring system. The outcome of this research shows that the continuous AE monitoring system successfully identified and located an individual corrosion-induced wire fracture in a fully grouted post-tensioned concrete beam.
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Gąćkowski, Roman, and Jacek Selejdak. "Assessment of the Effect of the Pre-cast Beams IG Axial Spacing on the Effort Bridge Span." Quality Production Improvement - QPI 1, no. 1 (July 1, 2019): 281–88. http://dx.doi.org/10.2478/cqpi-2019-0038.

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Abstract In designing of reinforced concrete bridges are often used pre-cast of pre-tensioned or post-tensioned prestressed members. In professional practice, when designing bridge span pre-cast of pre-tensioned prestressed beams IG type, different axial beams spacing’s are used and they are joined by a reinforced concrete slab. The paper presents a comparative analysis of an influence of the axial spacing of IG type beams in the cross-section of the bridge, on the bridge span effort, using standards PN-85/S-10042 and PN-EN 1992-2:2010. The optimal axial spacing of pre-cast IG type beams is presented, while maintaining the standard conditions of ULS (Ultimate Limit State). Such a solution has a positive impact on the costs of the entire project, significantly lowering the global investment cost.
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Bonopera, Marco, Kuo-Chun Chang, Chun-Chung Chen, Yu-Chi Sung, and Nerio Tullini. "Feasibility Study of Prestress Force Prediction for Concrete Beams Using Second-Order Deflections." International Journal of Structural Stability and Dynamics 18, no. 10 (October 2018): 1850124. http://dx.doi.org/10.1142/s0219455418501249.

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The safety and sustainability of prestressed concrete bridges can be improved with accurate prestress loss prediction. Considerable loss of the prestress force may imply damages hidden in the bridge. In this study, a prestress force identification method was implemented for concrete beams. Based on the Euler–Bernoulli beam theory, the procedure estimates the prestress force by using one or a set of static displacements measured along the member axis. The implementation of this procedure requires information regarding the flexural rigidity of the beam. The deflected shape of a post-tensioned concrete beam, subjected to an additional vertical load, was measured in a short term in several laboratory experiments. The accuracy of the deflection measurements provided favorable prestress force estimates. In particular, the “compression-softening” theory was validated for uncracked post-tensioned concrete beams.
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Dissertations / Theses on the topic "Post-tensioned concrete bridges"

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Cavell, Dominique Grace. "Assessment of deteriorating post-tensioned concrete bridges." Thesis, University of Sheffield, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267182.

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West, Jeffrey Steven. "Durability design of post-tensioned bridge substructures /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.

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Schokker, A. J. "Improving corrosion resistance of post-tensioned substructures emphasizing high performance grouts /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.

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Colbert, Benjamin Anthony. "Susceptibility of Venting Systems in Post-Tensioned Bridges to Chloride Intrusion." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1563197826745693.

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Sheedy, Patrick. "Alleviating concrete placement issues due to congestion of reinforcement in post-tensioned haunch-slab bridges." Thesis, Kansas State University, 2011. http://hdl.handle.net/2097/13251.

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Master of Science
Department of Civil Engineering
Robert Peterman
A flowable hybrid concrete mix with a spread of 17 to 20 inches was created with a superplasticizer to be used in post-tension haunch-slab (PTHS) bridges where rebar congestion is heaviest. The mix would allow for proper concrete consolidation. A conventional concrete mix with a slump of three to four inches was also created to be placed on top of the hybrid mix. The conventional mix would be used to create a sloping surface on the top of the concrete. The two mixes could be combined in the PTHS bridge deck and act as one monolithic specimen. Standard concrete tests such as compressive strength, tensile strength, modulus of elasticity, permeability, freeze/thaw resistance, and coefficient of thermal expansion were determined for the mixes and compared. Core blocks were cast using both mixes and composite cores were drilled. The cores were tested and their composite split-tensile strengths were compared to the split-tensile strengths of cylinders made from the respective mixes. A third concrete mix was made by increasing the superplasticizer dosage in the hybrid concrete mix to create a self-consolidating concrete (SCC) mix with a 24-inch spread. The SCC mix was created as a worst-case scenario and used in the determination of shear friction. Eighty-four push-off shear friction specimens were cast using the SCC mix. Joint conditions for the specimens included uncracked, pre-cracked, and cold-joints. Uncracked and pre-cracked specimens used both epoxy- and non-epoxy-coated shear stirrups. Cold-joint specimens used both the SCC mix and the conventional concrete mix. Joint-conditions of the cold-joint specimens included a one-hour cast time, a seven-day joint with a clean shear interface, and a seven-day joint with an oiled shear interface. The shear friction specimens were tested using a pure shear method and their results were compared to the current American Concrete Institute code equation.
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Herman, Reagan Sentelle. "Behavior of stiffened compression flanges of trapezoidal box girder bridges." Access restricted to users with UT Austin EID Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3035950.

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García, Segura Tatiana. "Efficient design of post-tensioned concrete box-girder road bridges based on sustainable multi-objective criteria." Doctoral thesis, Universitat Politècnica de València, 2016. http://hdl.handle.net/10251/73147.

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[EN] Bridges, as an important component of infrastructure, are expected to meet all the requirements for a modern society. Traditionally, the primary aim in bridge design has been to achieve the lowest cost while guaranteeing the structural efficiency. However, concerns regarding building a more sustainable future have change the priorities of society. Ecological and durable structures are increasingly demanded. Under these premises, heuristic optimization methods provide an effective alternative to structural designs based on experience. The emergence of new materials, structural designs and sustainable criteria motivate the need to create a methodology for the automatic and accurate design of a real post-tensioned concrete bridge that considers all these aspects. For the first time, this thesis studies the efficient design of post-tensioned concrete box-girder road bridges from a sustainable point of view. This research integrates environmental, safety and durability criteria into the optimum design of the bridge. The methodology proposed provides multiple trade-off solutions that hardly increase the cost and achieve improved safety and durability. Likewise, this approach quantifies the sustainable criteria in economic terms, and evaluates the effect of these criteria on the best values of the variables. In this context, a multi-objective optimization is formulated to provide multiple trade-off and high-performing solutions that balance economic, ecologic and societal goals. An optimization design program selects the best geometry, concrete type, reinforcement and post-tensioning steel that meet the objectives selected. A three-span continuous box-girder road bridge located in a coastal region is selected for a case study. This approach provides vital knowledge about this type of bridge in the sustainable context. The life-cycle perspective has been included through a lifetime performance evaluation that models the bridge deterioration process due to chloride-induced corrosion. The economic, environmental and societal impacts of maintenance actions required to extend the service life are examined. Therefore, the proposed goals for an efficient design have been switch from initial stage to life-cycle consideration. Faced with the large computational time of multi-objective optimization and finite-element analysis, artificial neural networks (ANNs) are integrated in the proposed methodology. ANNs are trained to predict the structural response based on the design variables, without the need to analyze the bridge response. The multi-objective optimization problem results in a set of trade-off solutions characterized by the presence of conflicting objectives. The final selection of preferred solutions is simplified by a decision-making technique. A rational technique converts a verbal pairwise comparison between criteria with a degree of uncertainty into numerical values that guarantee the consistency of judgments. This thesis gives a guide for the sustainable design of concrete structures. The use of the proposed approach leads to designs with lower life-cycle cost and emissions compared to general design approaches. Both bridge safety and durability can be improved with a little cost increment by choosing the correct design variables. In addition, this methodology is applicable to any type of structure and material.
[ES] Los puentes, como parte importante de una infraestructura, se espera que reúnan todos los requisitos de una sociedad moderna. Tradicionalmente, el objetivo principal en el diseño de puentes ha sido lograr el menor coste mientras se garantiza la eficiencia estructural. Sin embargo, la preocupación por construir un futuro más sostenible ha provocado un cambio en las prioridades de la sociedad. Estructuras más ecológicas y duraderas son cada vez más demandadas. Bajo estas premisas, los métodos de optimización heurística proporcionan una alternativa eficaz a los diseños estructurales basados en la experiencia. La aparición de nuevos materiales, diseños estructurales y criterios sostenibles motivan la necesidad de crear una metodología para el diseño automático y preciso de un puente real de hormigón postesado que considere todos estos aspectos. Por primera vez, esta tesis estudia el diseño eficiente de puentes de hormigón postesado con sección en cajón desde un punto de vista sostenible. Esta investigación integra criterios ambientales, de seguridad estructural y durabilidad en el diseño óptimo del puente. La metodología propuesta proporciona múltiples soluciones que apenas encarecen el coste y mejoran la seguridad y durabilidad. Al mismo tiempo, se cuantifica el enfoque sostenible en términos económicos, y se evalúa el efecto que tienen dichos criterios en el valor óptimo de las variables. En este contexto, se formula una optimización multiobjetivo que proporciona soluciones eficientes y de compromiso entre los criterios económicos, ecológicos y sociales. Un programa de optimización del diseño selecciona la mejor combinación de geometría, tipo de hormigón, armadura y postesado que cumpla con los objetivos seleccionados. Se ha escogido como caso de estudio un puente continuo en cajón de tres vanos situado en la costa. Este método proporciona un mayor conocimiento sobre esta tipología de puentes desde un punto de vista sostenible. Se ha estudiado el ciclo de vida a través de la evaluación del deterioro estructural del puente debido al ataque por cloruros. Se examina el impacto económico, ambiental y social que produce el mantenimiento necesario para extender la vida útil del puente. Por lo tanto, los objetivos propuestos para un diseño eficiente han sido trasladados desde la etapa inicial hasta la consideración del ciclo de vida. Para solucionar el problema del elevado tiempo de cálculo debido a la optimización multiobjetivo y el análisis por elementos finitos, se han integrado redes neuronales en la metodología propuesta. Las redes neuronales son entrenadas para predecir la respuesta estructural a partir de las variables de diseño, sin la necesidad de analizar el puente. El problema de optimización multiobjetivo se traduce en un conjunto de soluciones de compromiso que representan objetivos contrapuestos. La selección final de las soluciones preferidas se simplifica mediante una técnica de toma de decisiones. Una técnica estructurada convierte los juicios basados en comparaciones por pares de elementos con un grado de incertidumbre en valores numéricos que garantizan la consistencia de dichos juicios. Esta tesis proporciona una guía que extiende y mejora las recomendaciones sobre el diseño de estructuras de hormigón dentro del contexto de desarrollo sostenible. El uso de la metodología propuesta lleva a diseños con menor coste y emisiones del ciclo de vida, comparado con diseños que siguen metodologías generales. Los resultados demuestran que mediante una correcta elección del valor de las variables se puede mejorar la seguridad y durabilidad del puente con un pequeño incremento del coste. Además, esta metodología es aplicable a cualquier tipo de estructura y material.
[CAT] Els ponts, com a part important d'una infraestructura, s'espera que reunisquen tots els requisits d'una societat moderna. Tradicionalment, l'objectiu principal en el disseny de ponts ha sigut aconseguir el menor cost mentres es garantix l'eficiència estructural. No obstant això, la preocupació per construir un futur més sostenible ha provocat un canvi en les prioritats de la societat. Estructures més ecològiques i durables són cada vegada més demandades. Davall estes premisses, els mètodes d'optimització heurística proporcionen una alternativa eficaç als dissenys estructurals basats en l'experiència. L'aparició de nous materials, dissenys estructurals i criteris sostenibles motiven la necessitat de crear una metodologia per al disseny automàtic i precís d'un pont real de formigó posttesat que considere tots estos aspectos. Per primera vegada, esta tesi estudia el disseny eficient de ponts de formigó posttesat amb secció en calaix des d'un punt de vista sostenible. Esta investigació integra criteris ambientals, de seguretat estructural i durabilitat en el disseny òptim del pont. La metodologia proposada proporciona múltiples solucions que a penes encarixen el cost i milloren la seguretat i durabilitat. Al mateix temps, es quantifica l'enfocament sostenible en termes econòmics, i s'avalua l'efecte que tenen els dits criteris en el valor òptim de les variables. En este context, es formula una optimització multiobjetivo que proporciona solucions eficients i de compromís entre els criteris econòmics, ecològics i socials. Un programa d'optimització del disseny selecciona la millor geometria, tipus de formigó, armadura i posttesat que complisquen amb els objectius seleccionats. S'ha triat com a cas d'estudi un pont continu en calaix de tres vans situat en la costa. Este mètode proporciona un major coneixement sobre esta tipologia de ponts des d'un punt de vista sostenible. S'ha estudiat el cicle de vida a través de l'avaluació del deteriorament estructural del pont a causa de l'atac per clorurs. S'examina l'impacte econòmic, ambiental i social que produïx el manteniment necessari per a estendre la vida útil del pont. Per tant, els objectius proposats per a un disseny eficient han sigut traslladats des de l'etapa inicial fins a la consideració del cicle de vida. Per a solucionar el problema de l'elevat temps de càlcul degut a l'optimització multiobjetivo i l'anàlisi per elements finits, s'han integrat xarxes neuronals en la metodologia proposada. Les xarxes neuronals són entrenades per a predir la resposta estructural a partir de les variables de disseny, sense la necessitat d'analitzar el pont. El problema d'optimització multiobjetivo es traduïx en un conjunt de solucions de compromís que representen objectius contraposats. La selecció final de les solucions preferides se simplifica per mitjà d'una tècnica de presa de decisions. Una tècnica estructurada convertix els juís basats en comparacions per parells d'elements amb un grau d'incertesa en valors numèrics que garantixen la consistència dels dits juís. Esta tesi proporciona una guia que estén i millora les recomanacions sobre el disseny d'estructures de formigó dins del context de desenrotllament sostenible. L'ús de la metodologia proposada porta a dissenys amb menor cost i emissions del cicle de vida, comparat amb dissenys que seguixen metodologies generals. Els resultats demostren que per mitjà d'una correcta elecció del valor de les variables es pot millorar la seguretat i durabilitat del pont amb un xicotet increment del cost. A més, esta metodologia és aplicable a qualsevol tipus d'estructura i material.
García Segura, T. (2016). Efficient design of post-tensioned concrete box-girder road bridges based on sustainable multi-objective criteria [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/73147
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El, Hamad Hamad, and Furkan Tanhan. "Analysis of post-tensioned concrete box-girder bridges : A comparison of Incremental launching and Movable scaffolding system." Thesis, KTH, Bro- och stålbyggnad, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-233168.

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When designing a bridge it is of high importance that the geometry for the cross section is optimized for the structure. This is partly due to the influence of the amount of material needed and its impact on the budget and environment. The influence of choosing the right amount of each material lies in the unit-price of the different material, where they can differ significantly. The Swedish Transport Administration, Trafikverket, has ordered the construction of Stockholm Bypass which is one of Swedens largest infrastructure project and is valued to 27.6 billion SEK according to the price index of the year 2009. The infrastructure project is divided into multiple projects where one of them is assigned to Implenia and Veidekke through a joint venture (Joint venture Hjulsta, JVH) and is valued to nearly 800 MSEK. The reference bridge that is used in the analysis of the master’s thesis is a part of the project. The aim of this masters thesis was to analyze and compare the two construction methods, mov- able scaffolding system (MSS) and incremental launching for the reference bridge with respect to amount post-tensioning and slenderness. Furthermore, an economical comparison between the two construction methods was carried out based on the obtained results. The analysis of the MSS was carried out by modeling the reference bridge structure in the finite element software SOFiSTiK AG. The bridge was modeled with different cross section height, i.e. different slenderness where the optimal amount of post-tension tendons could be determined by iteration until stress conditions from the Eurocode were fulfilled. For the incremental launching method, a numerical analysis was performed. The optimal amount of required post-tensioning was evaluated in the construction stages and final stages with different construction heights i.e. different values of slenderness. A cost analysis was also performed where the aim was to analyze how the total cost of the construc- tion of the bridge would be influenced by the different slenderness of the bridge as a comparison for the two construction methods. This was done by dividing the costs into fixed costs and variable costs. The results showed that the structural rigidity had a large influence on the required amount of prestressing steel for both construction methods. In other words, the smaller the cross section the more prestressing steel was required. Incremental launching proved to require a much greater amount of (PT) tendons compared to the MSS although the identical cross sections and properties for both methods, except for the PT. The prestressing for incremental launching is generally by centrical prestressing during the construction stages. A intersection point was obtained in the cost analysis for the construction methods. The incremental launching was the cheaper solution for slenderness smaller than the intersection point at slenderness between 17 and 18. The MSS was cheaper than the incremental launching for slenderness larger than the intersection point.
Vid dimensionering av tvärsektioner i broar är det av stor vikt att optimera geometrin avseende materialåtgång då mängden material har stor på verkan på ett projekts budget samt miljö. Eftersom konstruktioner ofta består av olika byggnadsmaterial gäller det vid optimering att välja byggnadsmaterialen genom optimerad proportionalitet. Förbifart Stockholm, beställt av Trafikverket, är ett av Sveriges största infrastrukturprojekt och värderas till 27,6 miljarder kronor enligt 2009 års prisnivå. Infrastrukturprojektet är uppdelat i flera mindre entreprenader eller så kallade etapper. Den entreprenad som omfattar trafikplats Hjulsta Södra har blivit tilldelat till Implenia och Veidekke genom ett konsortium (Jointventure Hjulsta, JVH) och värderas till cirka 800 miljoner kronor. Den förspända betongbro som byggs i trafikplats Hjulsta ligger till grund för analysen i detta examensarbete och har använts som referens under vår studie. Syftet med examensarbete var att analysera och jämföra två de två olika produktionsmetoderna, Movable scaffolding system (MSS) och etappvis lansering med hänsyn till erforderlig mängd förspänningskablar och slankhet. Vidare, baserat på erhållna resultat, utfördes en ekonomisk analys och jämförelse mellan produktionsmetoderna. Analysen av MSS utfördes genom att modellera brokonstruktionen i mjukvaruprogrammet SOFiSTiK AG som bygger på finita elementmetoder. Konstruktionen modellerades för olika slankheter, där slankheten definieras som kvoten mellan maximala spannlängden och brons tvärsnittshöjd. Spannlängden hölls konstant medan tvärsnittshöjden varierade för att erhålla olika slankheter. Den optimala slankheten bestämdes genom iterering av mängd förspänningskablar tills spänningsvillkoren var uppfyllda enligt Eurocode. För analysen av etappvis lansering utfördes en numerisk analys vars den optimala mängden förspänningskablar utvärderades i byggskedet (construction stages) samt i slutskedet (final stage). Analysen utfördes på samma sätt för de olika slankheterna. Slutligen genomfördes en konstandsanalys för de olika metoderna. Syftet var att jämföra hur den totala kostnaden för uppförandet av brokonstruktionen skiljde sig för de olika slankheterna. Jämförelsen genomfördes genom att dela upp de olika kostnaderna i fasta kostnader samt rörliga kostnader. Resultaten från analysen visade att den erforderliga mängd förspänningskablar som behövs i en förspänd betongbro är beroende av den strukturella styvheten i tvärsektionen. En högre slankhet, alltså lägre tvärsnittshöjd, ger lägre styvhet och därav mer erforderlig förspänningskablar. Etappvis lansering visade sig vara den metod som krävde mer mängd förspänningskablar. I resultaten för kostnadsanalysen uppmättes en skärningspunkt, för en slankhet mellan 17-18, mellan de två olika metoderna. För förspända betongbroar med slankhet lägre än skärningsupunkten vid 17-18 är etappvis lansering det billigare alternativet. För slankheter högre än 17-18 är MSS det mer ekonomiskt lönsamma alternativet.
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Shmerling, Robert Zachary. "STRUCTURAL CONDITION ASSESSMENT OF PRESTRESSED CONCRETE TRANSIT GUIDEWAYS." Master's thesis, University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3529.

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Objective condition assessment is essential to make better decisions for safety and serviceability of existing civil infrastructure systems. This study explores the condition of an existing transit guideway system that has been in service for thirty-five years. The structural system is composed of six-span continuous prestressed concrete bridge segments. The overall transit system incorporates a number of continuous bridges which share common design details, geometries, and loading conditions. The original analysis is based on certain simplifying assumptions such as rigid behavior over supports and simplified tendon/concrete/steel plate interaction. The current objective is to conduct a representative study for a more accurate understanding of the structural system and its behavior. The scope of the study is to generate finite element models (FEMs) to be used in static and dynamic parameter sensitivity studies, as well load rating and reliability analysis of the structure. The FEMs are used for eigenvalue analysis and simulations. Parameter sensitivity studies consider the effect of changing critical parameters, including material properties, prestress loss, and boundary and continuity conditions, on the static and dynamic structural response. Load ratings are developed using an American Association for State Highway Transportation Officials Load and Resistance Factor Rating (AASHTO LRFR) approach. The reliability of the structural system is evaluated based on the data obtained from various finite element models. Recommendations for experimental validation of the FEM are presented. This study is expected to provide information to make better decisions for operations, maintenance and safety requirements; to be a benchmark for future studies, to establish a procedure and methodology for structural condition assessment, and to contribute to the general research body of knowledge in condition assessment and structural health monitoring.
M.S.
Department of Civil and Environmental Engineering
Engineering and Computer Science
Civil Engineering
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Bosworth, Kyle Judson. "Health Monitoring of the Veterans' Glass City Skyway: Vibrating Wire Strain Gage Testing, Study of Temperature Gradients and a Baseline Truck Test." Connect to Online Resource-OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=toledo1197693985.

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Thesis (M.S.)--University of Toledo, 2007.
Typescript. "Submitted as partial fulfillment of the requirements for the Master of Science in Civil Engineering." "A thesis entitled"--at head of title. Bibliography: leaves 86-87.
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Books on the topic "Post-tensioned concrete bridges"

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University, Natassia Brenkus Garrett Tatum Isaac Kreitzer The Ohio State. Repair and Maintenance of Post-Tensioned Concrete Bridges. Washington, D.C.: Transportation Research Board, 2021. http://dx.doi.org/10.17226/26172.

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Ghorbanpoor, Alireza. Evaluation of post-tensioned concrete bridge structures by the impact-echo technique. McLean, Va: U.S. Dept. of Transportation, Federal Highway Administration, 1993.

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Ghorbanpoor, Alireza. Evaluation of post-tensioned concrete bridge structures by the impact-echo technique. McLean, Va: U.S. Dept. of Transportation, Federal Highway Administration, 1993.

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Ghorbanpoor, Alireza. Evaluation of post-tensioned concrete bridge structures by the impact-echo technique. McLean, Va: U.S. Dept. of Transportation, Federal Highway Administration, 1993.

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Youakim, Samer Amir. A simplified method for prediction of long-term prestress loss in post-tensioned concrete bridges. La Jolla, Calif: Dept. of Structural Engineering, University of California, San Diego, 2006.

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Post-Tensioned Concrete Bridges. Thomas Telford Ltd, 1999. http://dx.doi.org/10.1680/pcb.27602.

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Durable Bonded Post-tensioned Concrete Bridges. Thomas Telford Ltd, 1996.

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1932-, Breen J. E., American Association of State Highway and Transportation Officials., and United States. Federal Highway Administration., eds. Anchorage zone reinforcement for post-tensioned concrete girders. Washington, D.C: Transportation Research Board, National Research Council, 1994.

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Durable bonded post-tensioned concrete bridges: Report of a working party. Slough: Concrete Society, 1996.

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Agency, Highways. Post Tensioned Concrete Bridges/Ponts En Beton Precontraint Par Post-Tension. Amer Society of Civil Engineers, 1999.

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Book chapters on the topic "Post-tensioned concrete bridges"

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Brookes, C. L., S. H. Buchner, and S. Mehrkar-Asl. "Assessment of Stresses in Post-Tensioned Concrete Bridges." In Bridge Management, 439–46. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4899-7232-3_39.

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Koekkoek, Rutger T., Cor van der Veen, and Ane de Boer. "Fatigue Tests on Post-tensioned Bridge Decks." In High Tech Concrete: Where Technology and Engineering Meet, 912–20. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-59471-2_106.

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Huang, Dongzhou, and Bo Hu. "Design of Post-Tensioned Spliced Girder Bridges." In Concrete Segmental Bridges, 559–616. CRC Press, 2020. http://dx.doi.org/10.1201/9780429485473-8.

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"Durability of post-tensioned concrete bridges." In Recent Developments In Bridge Engineering, 244–53. CRC Press, 2003. http://dx.doi.org/10.4324/9780203017876-20.

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Pearson-Kirk, D. "The Performance of Post-Tensioned Bridges." In Role of Concrete Bridges in Sustainable Development, 129–40. Thomas Telford Publishing, 2003. http://dx.doi.org/10.1680/rocbisd.32484.0012.

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Limongelli, M. P., D. Siegert, E. Merliot, J. Waeytens, F. Bourquin, R. Vidal, V. Le Corvec, I. Gueguen, and L. M. Cottineau. "Experimental damage identification in a post tensioned concrete beam." In Maintenance, Monitoring, Safety, Risk and Resilience of Bridges and Bridge Networks, 229. CRC Press, 2016. http://dx.doi.org/10.1201/9781315207681-83.

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Eichinger, E. M., U. Eder, and J. Kollegger. "Reliability-Based Maintenance Management of a Post-Tensioned Concrete Bridge." In Role of Concrete Bridges in Sustainable Development, 311–20. Thomas Telford Publishing, 2003. http://dx.doi.org/10.1680/rocbisd.32484.0028.

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"Improving structural reliability using a post-tensioned concrete floor system for major non-redundant steel bridges." In Sustainable Bridge Structures, 147–54. CRC Press, 2015. http://dx.doi.org/10.1201/b18775-10.

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Noble, D., M. Nogal, A. J. O’Connor, and V. Pakrashi. "A bespoke signal processing algorithm for operational modal testing of post-tensioned steel and concrete beams." In Maintenance, Safety, Risk, Management and Life-Cycle Performance of Bridges, 984–91. CRC Press, 2018. http://dx.doi.org/10.1201/9781315189390-133.

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"Development and combined application of NDT echo-methods for the investigation of post tensioned concrete bridges." In Advances in Bridge Maintenance, Safety Management, and Life-Cycle Performance, Set of Book & CD-ROM, 981–82. CRC Press, 2015. http://dx.doi.org/10.1201/b18175-404.

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Conference papers on the topic "Post-tensioned concrete bridges"

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Tzaveas, Theodoros, Kimon Paraschos, and Evgenia Gavaise. "Earthquake resistant post-tensioned concrete bridges in Egnatia Motorway." In IABSE Symposium, Weimar 2007: Improving Infrastructure Worldwide. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2007. http://dx.doi.org/10.2749/222137807796157922.

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Zokaie, Toorak. "Limit State Design of CIP Post-Tensioned Concrete Box Girder Bridges." In Structures Congress 2004. Reston, VA: American Society of Civil Engineers, 2004. http://dx.doi.org/10.1061/40700(2004)7.

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Fasching, Stephan, Sara Reichenbach, Tobias Huber, and Johann Kollegger. "Post tensioned box girder bridges made from thin-walled pre- fabricated elements." In IABSE Congress, New York, New York 2019: The Evolving Metropolis. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/newyork.2019.1520.

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<p>Nowadays large box-girder concrete bridges are either built using pre-cast segmental erection or in-situ casting of concrete. Using these methods sets limitations when it comes to construction speed or to segment length due to the weight of full-cast concrete segments. To close the gap between the two construction approaches, the Institute of Structural Engineering of the TU Wien has developed new technologies for bridge construction using thin-walled pre-fabricated elements originally used in building construction. Based on these developments, an innovative construction method has been proposed, which consists of the following steps:</p> <ul> <li>Highly automated production of thin-walled concrete elements in a pre-casting-plant</li> <li>On-site production of box-girder segments using thin-walled elements</li> <li>Connection of the segments with post-tensioning tendons to form a bridge girder</li> <li>Installation of the girder to its final position using any construction method as for example incremental launching or the balanced lift method</li> <li>Pumping of in-situ concrete, to complete the girder in the final position</li> </ul> <p>The presented research shows, that this approach is advantageous for construction methods, with large differences in bending moment distribution during the construction stages and the final state. The required amount of materials cannot only be reduced, but the construction process can be accelerated as well, therefore improving the efficiency in bridge construction. Results of tests on large-scale specimens, which will be described in detail, show the potential of the new method.</p>
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Ghorbanpoor, Al. "Magnetic-based NDE of steel in prestressed and post-tensioned concrete bridges." In Non-Destructive Evaluation Techniques for Aging Infrastructure & Manufacturing, edited by Ronald D. Medlock and David C. Laffrey. SPIE, 1998. http://dx.doi.org/10.1117/12.300105.

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Park, Yeun Chul, Ho-Kyung Kim, Chul-Hwan Yoo, and Suk-Hee Bong. "Estimation of Structural Safety for Internally Grouted Post-tensioned External Tendons." In IABSE Workshop, Helsinki 2017: Ignorance, Uncertainty, and Human Errors in Structural Engineering. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2017. http://dx.doi.org/10.2749/helsinki.2017.086.

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In February, 2016, one of the external tendons in pre‐stressed concrete (PSC) box girder bridge in Seoul was failed due to corrosion after 17 years of service. The failure was found during the thawing season regular inspection. Since it was the first tendon failure occurred in South Korea, in‐depth investigation was performed and found that multiple tendons were corroded at many different locations. Seoul City had been preparing for the maintenance of PSC box girder bridges, but the draft maintenance guideline considered overall condition of the bridge and little attention was paid to the condition of tendons. The bridge was evaluated as per the draft guideline and rated as ‘Medium Risk’ although one external tendon was failed. The indices for the evaluation should be properly weighted to prevent failure of tendons.
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Christensen, Matthew J., and Gottfried Millner. "The Use of Loop Anchorages in Single-Span Post-Tensioned Concrete Slab Bridges." In Structures Congress 2010. Reston, VA: American Society of Civil Engineers, 2010. http://dx.doi.org/10.1061/41130(369)32.

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Martí, J. V., J. Alcalá, T. García-Segura, and V. Yepes. "Heuristic design of a precast-prestressed concrete U-beam and post-tensioned cast-in-place concrete slab road bridges." In HPSM/OPTI 2016. Southampton UK: WIT Press, 2016. http://dx.doi.org/10.2495/hpsm160021.

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Jiang, Dongqi. "Extending span ranges and accelerating construction of spread slab beam bridges." In IABSE Congress, Christchurch 2021: Resilient technologies for sustainable infrastructure. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2021. http://dx.doi.org/10.2749/christchurch.2021.0229.

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<p>A new class of spread slab beam bridges has recently been developed and implemented in Texas. The research questions addressed in this paper are: how long can such a low profile bridge system span in either a simply supported or continuous form? And, can construction operations be accelerated, by design? An effective way to extend the span length is to utilize post-tensioning and to make the bridge continuous over several spans. In order to explore the maximum span limit, the design of a multi-span prestressed concrete spread slab beam bridge is investigated. In addition, a thicker and longer precast prestressed concrete panels (PCPs) that uses concentric pre-tensioned prestress is developed to facilitate accelerated bridge construction by reducing the need for field placement of deck reinforcement. It is shown that the span length may be extended from 15 m to 21 m as a continuous shallow profile bridge. The new solution for PCPs is verified to speed up field operations as compared to the traditional deck with stay-in-place PCPs and cast-in-place toppings.</p>
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Arenas, Juan José, Guillermo Capellán, Alejandro Godoy, Marianela García, Juan Ruiz, and Santiago Guerra. "La Florida Suspension Bridge. Oviedo, Spain." In IABSE Congress, Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2016. http://dx.doi.org/10.2749/stockholm.2016.2298.

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La Florida Bridge is a €5,9 million project promoted by Oviedo City Council to provide a new link between “La Florida” and “Western Park” neighbourhoods. The final design, developed by Arenas & Asociados, represents an innovation in urban bridges, solving the connection between both areas with a flying semi-circle roundabout suspended from its inner edge by a system of hangers.<p> The main novelty of this solution is that hangers and backstays are fixed to the same suspension system, composed by two main cables making a loop and anchored to an articulated mast. The structure is completed with a post-tensioned concrete approach viaduct, a composite connection span between roundabout and viaduct, two cantilever footbridges arising from the concrete deck and flying parallel to the roundabout, and finally, a concrete ring as counterweight for the backstays anchorage. K
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Sauter, Brett W., and Alex P. Durbak. "Inspection and Load Rating of P-T Segmental Bridges." In IABSE Congress, New York, New York 2019: The Evolving Metropolis. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/newyork.2019.2142.

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<p>The interchange of the Veterans Memorial Tollway (I-355) and the Ronald Reagan Memorial Tollway (I-88) in Downers Grove, Illinois includes four post-tensioned (P-T) segmental concrete box girder bridges erected with different techniques. Built in 1988, they range in length from 170m (558’) to over 610m (2,000’) on horizontally curved alignments To maintain the integrity of this vital infrastructure, the Illinois Tollway tasked Ciorba Group to perform full in-depth inspection, material testing, assessment of the P-T condition, and load rating. As part of this project we performed non-destructive testing of the P-T strands at select locations using ground penetrating radar and impact echo technology.</p><p>After the detailed inspection, the bridges were load rated taking into account the deterioration noted and using a time dependent Finite Element Analysis. We re-calculated all stresses as “locked-in” during bridge erection. The ramp bridges were load rated for the current single lane configuration as well as a potential future two lane configuration. An overall load rating and condition report was prepared which evaluated various bridge repairs and strengthening options including the use of UHPC structural overlay.</p>
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