Relevant bibliographies by topics / Post-tensioning construction

Academic literature on the topic 'Post-tensioning construction'

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Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Post-tensioning construction"

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Granello, Gabriele, Marco Broccardo, Alessandro Palermo, and Stefano Pampanin. "Fragility-based methodology for evaluating the time-dependent seismic performance of post-tensioned timber frames." Earthquake Spectra 36, no. 1 (January 28, 2020): 322–52. http://dx.doi.org/10.1177/8755293019878196.

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Since 2010, the construction of post-tensioned wooden buildings (Pres-Lam) has been growing rapidly worldwide. Pres-Lam technology combines unbonded post-tensioning tendons and supplemental damping devices to provide moment capacity to beam–column, wall–foundation, or column–foundation connections. In low seismic areas, designers may choose not to provide additional damping, relying only on the post-tensioning contribution. However, post-tensioning decreases over time due to creep phenomena arising in compressed timber members. As a consequence, there is a reduction of the clamping forces between the elements. This reduction affects the seismic response of Pres-Lam buildings in the case of low- and high-intensity earthquakes. Therefore, understanding and accounting for the post-tensioning losses and their uncertainty are paramount for a robust assessment of the safety of Pres-Lam constructions. So far, however, there have been no comprehensive studies which tackle the overall seismic performance of such systems in the presence of time-varying post-tension losses and the associated uncertainty. This study tackles this research gap by introducing a comprehensive seismic evaluation of Pres-Lam systems based on time-dependent fragility curves. The proposed fragility analysis is specifically designed to account systematically for time-varying post-tension losses and the related uncertainty. The method is applied to two case studies, designed, respectively, with and without supplemental damping devices. In terms of structural performance, results show that the use of additional dissipaters mitigates the effect of post-tensioning loss for earthquakes of high intensity. Conversely, performance under low-intensity earthquakes is strongly dependent on the post-tensioning value, as the reduction of stiffness due to the anticipated rocking motion activation would lead to damage to non-structural elements.
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Vill, Markus, Eva M. Eichinger, and Johann Kollegger. "Assessment of Damaged Post-Tensioning Tendons." Structural Engineering International 16, no. 1 (February 2006): 44–48. http://dx.doi.org/10.2749/101686606777962648.

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Di Cesare, Antonio, Felice Carlo Ponzo, Nicla Lamarucciola, and Domenico Nigro. "Experimental seismic response of a resilient 3-storey post-tensioned timber framed building with dissipative braces." Bulletin of Earthquake Engineering 18, no. 15 (October 6, 2020): 6825–48. http://dx.doi.org/10.1007/s10518-020-00969-y.

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Abstract With the increased number of multi-storey buildings in seismic areas, research efforts have been focused on developing earthquake resilient systems, such as low-damage techniques based on the combination of post-tensioning and dissipating devices. This paper describes the experimental study performed on a 3-storey post-tensioned timber framed (Pres-Lam) building equipped with energy dissipating systems. The testing project consisted of three phases adopting different configurations of the experimental model: (1) post-tensioning to beam-column joints only, (2) post-tensioning and dissipative rocking mechanisms and (3) post-tensioning and dissipative braces. The main objective of this paper is to experimentally investigate on the seismic response of a large-scale specimen with dissipative braces located in high seismic area, considering construction details similar to those adopted in practical applications. During the experimental campaign, the test frame was subjected to more than one hundred ground motions considering a set of seven spectra-compatible earthquakes at increasing intensity levels. The dissipating bracing system with external replaceable hysteretic dampers improves the seismic resilience of multi-storey Pres-Lam buildings, showing inter-storey drift comparable to those with rocking walls, with full recentring capability and without structural damages or post-tensioning losses through seismic tests.
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subcommittee on Anderson Post-tensi. "RECOMMENDATIONS FOR DESIGN AND CONSTRUCTION BY ANDERSON POST-TENSIONING METHOD." Doboku Gakkai Ronbunshu, no. 378 (1987): 47–48. http://dx.doi.org/10.2208/jscej.1987.378_47.

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Guo, Quanquan, Zhu Li, and Lian Duan. "Automatic Post-Tensioning in Prestressed Concrete Structures." Structural Engineering International 14, no. 1 (February 2004): 37–41. http://dx.doi.org/10.2749/101686604777964242.

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El-Zohairy, Ayman, and Hani Salim. "Parametric study for post-tensioned composite beams with external tendons." Advances in Structural Engineering 20, no. 10 (January 8, 2017): 1433–50. http://dx.doi.org/10.1177/1369433216684352.

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Strengthening of bridge superstructures composite beams with external post-tensioned tendons is a good technique for strengthening the existing structures. In this study, a numerical model is illustrated to study the nonlinear simulation of composite beams stiffened with externally post-tensioned tendons. The accuracy of the developed numerical model is validated using comparisons between the numerical and existing test data. The influence of various strengthening parameters is investigated, which include draped versus straight tendons, tendon length, the effect of post-tensioning on reinstating the flexural behavior of an overloaded beam, tendon eccentricity, and the degree of shear connection. A good agreement between the proposed model and the test data is obtained. The results demonstrate that at the same tendon eccentricity, the trapezoidal profile shows better behavior for the strengthened beams. However, more ductility is obtained when using the straight tendon profile. Applying post-tensioning through the beam of full length helps to reduce the creation of fatigue cracks, which always start at stress raisers, and subsequently increases the fatigue life of the composite beam. Also, the external post-tensioning effectively maintains the flexural behavior of the overloaded strengthened beam after unloading in comparison to the un-strengthened beam. It is observed that 80% degree of shear connection or higher is recommended to obtain the desired performance of the external post-tensioning force for strengthening composite beams.
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Dunker, Kenneth F., F. Wayne Klaiber, and Wallace W. Sanders. "Post‐Tensioning Distribution in Composite Bridges." Journal of Structural Engineering 112, no. 11 (November 1986): 2540–53. http://dx.doi.org/10.1061/(asce)0733-9445(1986)112:11(2540).

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Hansen, Jenna, Kromel Hanna, and Maher K. Tadros. "Simplified transverse post-tensioning construction and maintenance of adjacent box girders." PCI Journal 57, no. 2 (March 1, 2012): 64–79. http://dx.doi.org/10.15554/pcij.03012012.64.79.

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Dueñas Puentes, Diego Ernesto, and Maritzabel Molina Herrera. "Wobble friction coefficient in post-stressed concrete." Ingeniería e Investigación 27, no. 3 (September 1, 2007): 16–23. http://dx.doi.org/10.15446/ing.investig.v27n3.14841.

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This work was aimed at establishing a wobble friction coefficient (K) from records regarding some post-stressed bridges built in Colombia. Such records were arranged and analysed together with stress diagrams resulting from the corresponding plans, calculations and reports. Suitable records were produced from this review to make the analysis. Once the records had been selected, the probable wobble friction coefficient (K) was then calculated for each case and this coefficient was related to the length of the cable and the total area of the strands composing the cable. These records and their results were subsequently grouped according to the type of bridge to produce a wobble friction coefficient (K) for each specific structure. The study indicated that the wobble friction coefficient was lower than that indicated by the Colombian Seismic Bridge Design Code, Instituto Nacional De Vías, 1995]. The influence of tensioning equipment, materials and labour suggested a format for recording tensioning to reduce inaccuracy when readings are being taken. A reduction in the costs of tensioning would arise from taking the forgoing into account.
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Stein, Abigail, Aled R. Hughes, Rick Deschamps, and Brian D. Barkauskas. "Wanapum Dam repaired using post-tensioning anchors." DFI Journal - The Journal of the Deep Foundations Institute 12, no. 2 (May 4, 2018): 81–93. http://dx.doi.org/10.1080/19375247.2018.1562599.

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Dissertations / Theses on the topic "Post-tensioning construction"

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Kajewski, Stephen L. "Post-tensioning and its effect on multi-level formwork load distribution." Thesis, Queensland University of Technology, 1998. https://eprints.qut.edu.au/36033/8/36033_Digitised_Thesis.pdf.

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Multi-level concrete buildings requrre substantial temporary formwork structures to support the slabs during construction. The primary function of this formwork is to safely disperse the applied loads so that the slab being constructed, or the portion of the permanent structure already constructed, is not overloaded. Multi-level formwork is a procedure in which a limited number of formwork and shoring sets are cycled up the building as construction progresses. In this process, each new slab is supported by a number of lower level slabs. The new slab load is, essentially, distributed to these supporting slabs in direct proportion to their relative stiffness. When a slab is post-tensioned using draped tendons, slab lift occurs as a portion of the slab self-weight is balanced. The formwork and shores supporting that slab are unloaded by an amount equivalent to the load balanced by the post-tensioning. This produces a load distribution inherently different from that of a conventionally reinforced slab. Through , theoretical modelling and extensive on-site shore load measurement, this research examines the effects of post-tensioning on multilevel formwork load distribution. The research demonstrates that the load distribution process for post-tensioned slabs allows for improvements to current construction practice. These enhancements include a shortening of the construction period; an improvement in the safety of multi-level form work operations; and a reduction in the quantity of form work materials required for a project. These enhancements are achieved through the general improvement in safety offered by post-tensioning during the various formwork operations. The research demonstrates that there is generally a significant improvement in the factors of safety over those for conventionally reinforced slabs. This improvement in the factor of safety occurs at all stages of the multi-level formwork operation. The general improvement in the factors of safety with post-tensioned slabs allows for a shortening of the slab construction cycle time. Further, the low level of load redistribution that occurs during the stripping operations makes post-tensioned slabs ideally suited to reshoring procedures. Provided the overall number of interconnected levels remains unaltered, it is possible to increase the number of reshored levels while reducing the number of undisturbed shoring levels without altering the factors of safety, thereby, reducing the overall quantity of formwork and shoring materials.
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Sullivan, Sean Robert. "Construction and Behavior of Precast Bridge Deck Panel Systems." Diss., Virginia Tech, 2007. http://hdl.handle.net/10919/27479.

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A bridge with precast bridge deck panels was built at the Virginia Tech Structures Laboratory to examine constructability issues, creep and shrinkage behavior, and strength and fatigue performance of transverse joints, different types of shear connectors, and different shear pocket spacings. The bridge consisted of two AASHTO type II girders, 40 ft long and simply supported, and five precast bridge deck panels. Two of the transverse joints were epoxied male-female joints and the other two transverse joints were grouted female-female joints. Two different pocket spacings were studied: 4 ft pocket spacing and 2 ft pocket spacing. Two different shear connector types were studied: hooked reinforcing bars and a new shear stud detail that can be used with concrete girders. The construction process was well documented. The change in strain in the girders and deck was examined and compared to a finite element model to examine the effects of differential creep and shrinkage. After the finite element model verification study, the model was used to predict the long term stresses in the deck and determine if the initial level of post-tensioning was adequate to keep the transverse joints in compression throughout the estimated service life of the bridge. Cyclic loading tests and shear and flexural strength tests were performed to examine performance of the different pocket spacings, shear connector types and transverse joint configurations. A finite element study examined the accuracy of the AASHTO LRFD shear friction equation for the design of the horizontal shear connectors. The initial level of post-tensioning in the bridge was adequate to keep the transverse joints in compression throughout the service life of the bridge. Both types of pocket spacings and shear connectors performed exceptionally well. The AASHTO LRFD shear friction equation was shown to be applicable to deck panel systems and was conservative for determining the number of shear connectors required in each pocket. A recommended design and detailing procedure was provided for the shear connectors and shear pockets.
Ph. D.
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Hockerman, Samantha Jo. "Laboratory testing of precast bridge elements, verification of post-tensioning forces and construction documentation of the Boone County IBRC accelerated bridge replacement project." [Ames, Iowa : Iowa State University], 2007.

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Krauser, Gaelyn B. "Optimization of Two-Way Post-Tensioned Concrete Floor Systems." DigitalCommons@CalPoly, 2009. https://digitalcommons.calpoly.edu/theses/181.

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This thesis investigates a parametric study of a flat plate floor system designed using post-tensioning. The load balanced by the post-tensioning, the slab depth, and the strength of concrete were varied to create the parametric study of a hotel/condominium grid layout. In order to perform the parametric study, research was conducted on the development of post-tensioning, methods of analysis for two-way slab design, and post-tensioning methods of analysis. Design was conducted by hand through a series of Excel spreadsheets and compared to results found using the computer analysis program, ADAPT-PT. The designs found in the parametric study were then used to perform a cost analysis across ten cities in the United States: Atlanta, Boston, Chicago, Denver, Houston, Los Angeles, Miami, Phoenix, San Francisco, and Seattle. The designs from the hand analysis and the ADAPT-PT model provided similar results for the post-tensioning, and both methods provide an adequate design. The use of ADAPT-PT is recommended because of its ease of use and quick calculation capabilities. The designs of the hand analysis were quantified and along with unit prices gathered from contractors and suppliers the cost analysis found that the design with 100% of the dead load balanced provided the least expensive solution for all the cities, and the design using a 6000 psi strength concrete provide the most expensive solution for all cities. The least expensive slab design was $9.02 per square foot in Atlanta, Georgia, and the most expensive slab design was $24.96 per square foot in Miami, Florida. A more rigorous parametric study in the future may provide a better optimization for the hotel/condominium slab investigated as the parametric study of this thesis found costs which varied by less than 10% between the most expensive and least expensive slabs in the ten cities.
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Pelikán, Adam. "Střecha plaveckého stadionu." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226932.

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This diploma thesis is about designing the structure of roof of swimming stadium. Three solutions are created - concrete arc with tie, steel truss slab and concrete pretensioned membrane. One choosed solution - concrete pretensioned membrane - is afterwards developed. In the beginning there are several designs of geometry fulfilling the requirements for given type of structure being created. In part of static calculation, the parametrical mathematical model in form of macro in APDL language for Ansys software has been created. Afterwards all the parameters (initial state of cables, level of pretension, dimensions of membrane and peripheral frame, etc.) has been optimized in order to the membrane be fulfilling criterias for ultimate limit state and serviceability limit state. Afterwards other selected parts of structure has been checked. On basis of designed geometry and design checks in static calculation the drawings of conctruction and designed parts has been created. In the end, the 3D model of the structure has been created in graphical software Rhinoceros. Then visualizations of structure in concstruction stages and after completion has been rendered.
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Gric, Pavel. "Analýza konzolového vyložení administrativní budovy." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227745.

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This diploma thesis is about analysis of post-tensioned cantilever beam, which is part of cantilever of commercial building. The main part of thesis is evaluation of behavior of building structure in time and determination of the most suitable staging. Next part of thesis is design and evaluation of reinforced slab and beam.
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Miechová, Zuzana. "Předpjatá stropní konstrukce nákupního centra." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2012. http://www.nusl.cz/ntk/nusl-225696.

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The aim of the Master´s thesis is to design the prestressed floor construction of the shopping centre. The construction is supported by the columns with the maximal span dimensions 16,0*16,6 m. The design is made according to the VSL (VSL International Ltd.)slab system - post-tensioned slab prestressed by the unbonded system of 4 monostrand units. In the thesis there is also made a simplified design of the reinforced concrete floor construction supported with the bigger amount of the columns. It is made a comparison of the both types of the floor slabs and the evaluation of their advantages and disadvantages. The statical analysis and the calculation of the internal forces is assessed by the program Nexis 3.60.15 32.
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Lon, Thou，Chin, and 饒慶龍. "The Detail Study of Post-Tensioning Concrete Box Segment Bridge Construction by Balanced Cantilever Method." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/66152409608260815192.

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Visscher, Brent Tyler. "Innovative Pre-cast Cantilever Constructed Bridge Concept." Thesis, 2008. http://hdl.handle.net/1807/11170.

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Minimum impact construction for bridge building is a growing demand in modern urban environments. Pre-cast segmental construction is one solution that offers low-impact, economical, and aesthetically pleasing bridges. The standardization of pre-cast concrete sections and segments has facilitated an improved level of economy in pre-cast construction. Through the development of high performance materials such as high strength fibre-reinforced concrete (FRC), further economy in pre-cast segmental construction may be realized. The design of pre-cast bridges using high-strength FRC and external unbonded tendons for cantilever construction may provide an economical, low-impact alternative to overpass bridge design. This thesis investigates the feasibility and possible savings that can be realized for a single cell box girder bridge with thin concrete sections post-tensioned exclusively with external unbonded tendons in the longitudinal direction. A cantilever-constructed single cell box girder with a curtailed arrangement of external unbonded tendons is examined.
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GALES, JOHN. "Transient High-Temperature Prestress Relaxation of Unbonded Prestressing Tendons for use in Concrete Slabs." Thesis, 2009. http://hdl.handle.net/1974/5218.

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Unbonded post-tensioned (UPT) flat plate concrete slabs have seen widespread use in multi-storey office and condominium buildings since the 1960s. The popularity of these systems can be attributed to various economic and structural benefits, including reductions in slab thickness, storey height, building mass, and excellent deflection control over large spans. The “inherent fire resistance” of these systems is often quoted as a key additional benefit as compared with competing structural systems. Such statements are apparently based largely on satisfactory results from large scale standard fire resistance tests performed on UPT slabs during the 1960s and on experience from real fires in UPT buildings. However, much remains unknown about the true structural behaviour of continuous multiple bay UPT slabs in real building fires. For instance, relatively little data exist on the effects of elevated temperature on cold drawn prestressing steel under realistic, sustained service stress levels. The primary objective of this thesis is to provide a greater understanding of the high-temperature performance (predominantly related to prestress relaxation) of prestressing steel used in UPT flat plate slabs. A computational model is developed, extending previous research by others, to predict transient high temperature stress relaxation (i.e., prestress loss) for a tendon in a typical UPT multiple span flat plate concrete slab under transient heating and cooling. The computational model is validated by comparison against a series of novel high temperature experiments on locally-heated, stressed, and restrained prestressing tendons with realistic as-built configurations. Reasonable agreement between measured and predicted prestress losses is observed, although some refinement of the model’s input parameters may be required. Test data also indicate that the most crucial fire scenario on a UPT concrete slab may be localized heating rather than a global, fully developed fire. The model is subsequently used to predict the capacity in flexure and punching shear of a UPT flat plate structure under various spatial and temporal heating regimes. The results highlight the need for particular care in the construction of UPT slabs to ensure adequate, robust concrete cover for structural fire safety.
Thesis (Master, Civil Engineering) -- Queen's University, 2009-09-24 18:27:25.559
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Books on the topic "Post-tensioning construction"

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Fédération internationale de la précontrainte. Commission on Prestressing Materials and Systems. Recommendations for the acceptance of post-tensioning systems. London: SETO, 1993.

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O'Brien, J. Scott. Very early post-tensioning of prestressed concrete pavements. Austin, Tex: Center for Transportation Research, Bureau of Engineering Research, University of Texas at Austin, 1985.

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Theryo, Teddy S. Guidelines for sampling, assessing, and restoring defective grout in prestressed concrete bridge post-tensioning ducts. McLean, VA: U.S. Department of Transportation, Federal Highway Administration, Research, Development, and Technology, Turner-Fairbank Highway Research Center, 2013.

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Post-tensioning manual. [S.l.]: Post-Tensioning Institute, 2006.

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Institute, Post-Tensioning, ed. Post-tensioning manual. 4th ed. Phoenix, AZ (301 W. Osborn, Suite 3500, Phoenix 85013): Post-Tensioning Institute, 1985.

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Institute, Post-Tensioning, ed. Post-tensioning manual. 5th ed. Phoenix, AZ: Post-Tensioning Institute, 1990.

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Fédération internationale du béton. Task Group 1.1., ed. Post-tensioning in buildings: Technical report. Lausanne, Switzerland: International Federation for Structural Concrete, 2005.

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Training and Certification of Field Personnel for Unbonded Post-Tensioning (Leverl 1: Field fundamentals). PTI, 2003.

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Book chapters on the topic "Post-tensioning construction"

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"Unbonded Post-Tensioning System Technology in Building Construction." In Concrete Construction Engineering Handbook, 497–542. CRC Press, 2008. http://dx.doi.org/10.1201/9781420007657-17.

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Barth, Florian. "Unbonded Post-Tensioning System Technology in Building Construction." In Concrete Construction Engineering Handbook. CRC Press, 2008. http://dx.doi.org/10.1201/9781420007657.ch12.

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Conference papers on the topic "Post-tensioning construction"

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"Shear Repair of Reinforced Concrete Beams Using Post-Tensioning." In "SP-193: Repair, Rehabilitation, and Maintenance of Concrete Structures, and Innovations in Design and Construction - Pro". American Concrete Institute, 2000. http://dx.doi.org/10.14359/9944.

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Jiang, Tianyong, Bin He, Yaowen Zhang, Zhongchu Tian, and Gangbing Song. "Monitoring of Grouting Compactness in a Post-Tensioning Curve Tendon Duct Using Piezoceramic Transducers." In 17th Biennial International Conference on Engineering, Science, Construction, and Operations in Challenging Environments. Reston, VA: American Society of Civil Engineers, 2021. http://dx.doi.org/10.1061/9780784483381.028.

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Moideen, Hisham, Stephane Le-Guennec, Alaa M. Mansour, Cheng Peng, and Mark Huntley. "Design Considerations for Polyester Construction Stretch Removal and its Impact on Mooring System Design." In Offshore Technology Conference. OTC, 2021. http://dx.doi.org/10.4043/31171-ms.

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Abstract Polyester based mooring systems offer unique challenges from design, analysis and installation perspective. Non-linear elongation behavior of the fiber is key to these challenges. A good understanding of the fiber elongation characteristics is critical to the design of a robust and efficient mooring system. Mooring systems are one of the primary contributors to the CAPEX of the Floating Production Units (FPU) and the drive to develop cost effective systems has led to improvements/changes to mooring systems. Off-vessel tensioning has been in use for several years, but the option has recently received more in-depth consideration. Off-vessel tensioning is becoming the standard for floating systems with the elimination of on-vessel tensioning systems. The elimination of on-vessel tensioning system brings upon new challenges in terms of mooring line installation and tensioning. A key driver for these systems is the polyester rope pre-load criteria primarily used to remove construction stretch and jump the creep curve that the system may experience. The challenges to each project are unique, however, understanding and assessing the key design impacts will be beneficial to the industry. This paper focuses on the design of a polyester based mooring system with focus on polyester fiber elongation characteristics and its impact on the design and installation. A polyester test program is established to understand the rope elongation behavior and impact of various pre-load levels. Installation assessment is also performed to understand the installation vessel requirements to achieve various pre-loads. Based on the studies, design updates are made to the mooring system and a novel two tension regime mooring system is proposed. Design impact of the two pre-tension system on various design criterions are evaluated and presented in this paper. The paper also makes recommendations on target pre-load and elongation to be considered in systems that do not plan to re-tension their system post installation. Authors appreciate that recommendations and observations reported may not be applicable for all types of floaters and mooring system.
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Fasching, Stephan, Michael Rath, Tobias Huber, and Johann Kollegger. "Semi-Precast Segmental Bridge Construction Method: construction of a prototype and shear tests on cross-frames." In IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2022. http://dx.doi.org/10.2749/prague.2022.1707.

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<p>The Institute for Structural Engineering of TU Wien is investigating the use of thin‐walled pre‐ fabricated elements, for the construction of box girder bridges. Thin‐walled pre‐fabricated elements, such as double walls and semi‐pre‐fabricated slab elements have been used successfully in building construction for years. The aim of the research project is to create a fast, economic and resource saving construction method for the erection of lightweight bridge girders from segments, utilizing thin‐walled pre‐fabricated elements and post‐tensioning.</p><p>The newly developed construction method consists of the following steps:</p><ul><li><p>Highly automated production of thin‐walled concrete elements in a pre‐fabrication plant</p></li><li><p>On site assembly of box‐girder segments using the thin‐walled elements and standard steel screws</p></li><li><p>Connection of the segments with post‐tensioning tendons to form a bridge girder</p></li><li><p>Movement of the lightweight semi‐pre‐fabricated girder to its final position using any chosen construction method as for example incremental launching or the balanced lift method.</p></li><li><p>Completion of the cross‐section by pumping in‐situ concrete onto the girder in its final position</p></li></ul><p>In the paper, the construction method will be described. Based on this, the planning and construction of a prototype‐segment made from thin‐walled prefabricated elements will be shown. Furthermore, shear tests on double wall elements and thin‐walled plates with steel girders, which are essential parts for the newly developed construction method, will be presented and compared to manual calculations based on the Eurocode 3 for two of the tested specimens.</p>
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Kromoser, Benjamin, and Johann Kollegger. "Using Ice to Build Shell Structures." In SNAME 10th International Conference and Exhibition on Performance of Ships and Structures in Ice. SNAME, 2012. http://dx.doi.org/10.5957/icetech-2012-173.

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Over the last few years different methods for building shells by using a combination of pneumatic formwork and post-tensioning technologies have been investigated at Vienna University of Technology. The idea behind all these construction methods is to build ice shells with double curvature originating from an initial plane plate. The various construction methods will be presented and the experiments on spherical shells with base diameters of approximately 10m will be described.
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Potucek, Jindrich. "Cost and process optimization of precast segmental bridges in Israel." In IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2022. http://dx.doi.org/10.2749/prague.2022.1723.

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<p>The paper addresses the use precast segment technology for concrete box bridges in the roadway infrastructure of Israel and the fabrication advantages achieved by reuse of segment mould on multiple projects. Ten bridges with different roadway width, superstructure height and span length are presented, showing the variability of the designed section and what modifications are required to the casting mould. Consideration is made for different equipment used in the balanced cantilever construction – gantry or ground cranes. Finley Engineering Group (FINLEY) has provided the design and construction engineering of the noted projects including: superstructure design, post- tensioning design, temporary support system, camber geometry and erection elevations.</p>
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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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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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Devenes, Julie, Jan Brütting, Maléna Bastien-Masse, Célia Küpfer, and Corentin Fivet. "Re:crete – a Footbridge Made of Reused Concrete Blocks." In Footbridge 2022 (Madrid): Creating Experience. Madrid, Spain: Asociación Española de Ingeniería Estructural, 2022. http://dx.doi.org/10.24904/footbridge2022.269.

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<p>Today, concrete is the most widely used construction material worldwide. Strong, versatile, durable, and vector of economic development, this exceptional material is also the principal cause of greenhouse-gas emissions, material depletion and waste generation by the construction industry. Hence, reusing concrete elements extracted from obsolete building structures has large potential to significantly reduce the environmental impact of construction. To demonstrate the potential of such an unusual strategy for bridge construction, this paper shows the construction of the Re:Crete arch prototype. It is made of 25 reclaimed concrete blocks connected through post-tensioning to create a 10-m span arch. The complete design-and-build workflow of the prototype is presented, including the structural design of the arch, the sourcing of the reusable concrete elements and the assembly. The Re:Crete arch prototype mechanical properties and environmental impact are assessed through non-destructive investigation, load testing and Life-Cycle Assessment. The results show that the reuse of concrete blocks leads to a comparable structural behaviour as a similar arch made of new or recycled concrete, with an environmental footprint reduced by more than 70%.</p>
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Schaarschmidt, David, and Holger Flederer. "Fatigue-resistant design of modular bridges made of precast concrete elements." In IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2022. http://dx.doi.org/10.2749/prague.2022.1382.

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<p>Modular construction with precast concrete has been becoming increasingly important for years. While the advantages of conventional precast construction have already been used for decades, modular structures go one step further due to the fact that no in-situ concrete or mortar is required. One way of transferring forces is to activate surface friction by post-tensioning. While shear bearing capacity is largely dependent on static friction, flexural capacity is linked to the decompression of dry joints. Two primary fields of application are bridge structures and wind turbines. Both groups of structures are stressed by non-static loads. In order to design them fatigue-resistant, an in-depth knowledge of this discontinuity zone is required. For this reason, experimental investigations, finite element analysis and probabilistic calculations were coupled in this study. The goal is a design proposal that allows the fatigue-proof design of dry joints.</p>
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Reports on the topic "Post-tensioning construction"

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Roesler, Jeffery, Sachindra Dahal, Dan Zollinger, and W. Jason Weiss. Summary Findings of Re-engineered Continuously Reinforced Concrete Pavement: Volume 1. Illinois Center for Transportation, May 2021. http://dx.doi.org/10.36501/0197-9191/21-011.

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This research project conducted laboratory testing on the design and impact of internal curing on concrete paving mixtures with supplementary cementitious materials and evaluated field test sections for the performance of crack properties and CRCP structure under environmental and FWD loading. Three experimental CRCP sections on Illinois Route 390 near Itasca, IL and two continuously reinforced concrete beams at UIUC ATREL test facilities were constructed and monitored. Erodibility testing was performed on foundation materials to determine the likelihood of certain combinations of materials as suitable base/subbase layers. A new post-tensioning system for CRCP was also evaluated for increased performance and cost-effectiveness. This report volume summarizes the three year research effort evaluating design, material, and construction features that have the potential for reducing the initial cost of CRCP without compromising its long-term performance.
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