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Showing 1 to 20 of 29 for “"post-tensioning"”.
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Development of timber concrete composite (TCC) beam with post-tensioning
Post-tensioning is a method of reinforcing (strengthening) concrete or other materials with high-strength steel strands or bars. The timber type that is used in all researches is the engineering timber products laminated veneer lumber (LVL) and glue-laminated wood (Glu-Lam), while avoiding using …
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Behavior of Post-Tensioning Systems Subjected to Inelastic Cyclic Loading
Post-tensioning (PT) strands have been employed in a number of self-centering seismic force resisting systems as part of the restoring force mechanism which virtually eliminates residual building drifts following seismic loading. As a result of the PT strands large elastic deformation capability, …
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Seismic Performance of Unreinforced Masonry Walls Retrofitted with Post-tensioning Tendons
… URM walls to allow for the insertion of a single post-tensioning (PT) tendon. Tendons are spaced at a regular interval and anchored at the top of the wall parapet and at the lower diaphragm level. Tensioning of the tendons imparts a compressive stress to the wall that effectively increases the …
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Recommendations for Longitudinal Post-Tensioning in Full-Depth Precast Concrete Bridge Deck Panels
… decks. Research has shown that longitudinal post-tensioning helps keep the precast bridge deck in compression and avoid problems such as leaking, cracking, spalling, and subsequent rusting on the beams at the transverse panel joints. Current design recommendations suggest levels of initial …
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Strategic Integration
… the integration of 3D printing with clay and post-tensioning techniques, seeking to establish a structural reinforcement system for 3D-printed clay pieces. The primary goal is to marry the inherent flexibility of clay with the strength provided by post-tensioning, thereby introducing a novel …
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Validation of the deck behaviour due to post-tension loading of Ashton arch bridge
… structural behaviour of the tie-beams, after the post-tensioning construction stage. This objective was achieved by validating selected finite element model parameters with field conducted tests. The input parameter, which is the prestress loading onto the structure, was validated with tendon …
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Laminar cracking in post-tensioned concrete nuclear containment buildings
… structure, the long-term integrity of post-tensioned concrete containment buildings (PCCs) is necessary for continued operation of the reactors they house. In 2009, during preparations for a steam generator replacement, extensive subsurface laminar cracking was identified in a portion …
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Structural Performance of Longitudinally Post-Tensioned Precast Deck Panel Bridges
… of a lack of research concerning the required post-tensioning force, shear stud pocket placement, and proper joint design. In a recent dissertation (Swenty 2009) numerous recommendations were made for joint design, shear stud pocket design, and post-tensioning force for full-depth precast deck …
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The Characterization and Control of Shape Memory Alloy Cables for Reinforcement of Engineered Cementitious Composite Beams
… of the Nitinol cable during the process of post-tensioning of the ECC beam. In this research, the shape memory effect of the same superelastic Nitinol cable when its temperature was below its martensite finish temperature was used to post-tensioning the ECC beam with a pre-loaded force. …
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Active control of extremely prestressed simple supported composite bridges
… of all solutions is utilizing external post tensioning cables to add to the stiffness of the system. External post tensioning can be considered to be a cheap solution that is easy to install, and easy to fix in the future. What has not been discussed among engineers is the possibility of …
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Performance and Design of Anchorage Zones for Post-Tensioned Box Girder Bridges
Post-tensioned box girder bridges are very common form of bridge construction. The post-tensioning anchorage zone is the location where very large prestressing forces are applied to the box girder, and then spread into the box section. The spreading of the large compressive forces creates …
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Testing of the Transverse Tendon Behavior in the Varina-Enon Bridge
Post-tensioned segmental concrete bridges have been used in the United States since the mid 80's. Post-tensioning is very economical and efficient for bridges with very long spans. A segmental concrete bridge uses post-tensioning to connect concrete bridge segments and make a long span bridge. A …
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Two Dimensional Linear Finite Element Analysis Of Post-tensioned Beams
… Element Routine for the Linear Analysis of Post-Tensioned beams using the program CALFEM® [20] developed at the division of Structural Mechanics in Lund University, Sweden. The program CALFEM and our own made files were written in MATLAB, an easy to learn and user-friendly computer …
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Shake table testing of hybrid wood shear wall system
… located in high seismic regions. The concept of post-tensioning mass timber has been adopted from concrete systems and this led to development of seismically resilient structural systems that can undergo multiple earthquake and continue to re-center. This thesis presents the results of a shake …
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Construction and Behavior of Precast Bridge Deck Panel Systems
… 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 …
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The Investigation of Transverse Joints and Grouts on Full Depth Concrete Bridge Deck Panels
… bridge in Virginia. Two cast-in-place and four post-tensioned joints were designed and tested in cyclical loading. Each joint was tested on a full scale two girder setup in negative bending with a simulated HS-20 vehicle. The blockouts were built as hollow concrete rings filled with grout and …
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Fatigue and static behaviour of post-tensioned steel-concrete composite beams
… composite (SCC) bridge superstructures using post-tensioned steel tendons offers many advantages. Since bridge structures are usually exposed to fatigue cycles, understanding the fatigue behavior of strengthened composite beams is vital. Also, bridges in practice are subject to various types …
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Automated Engineering Design for Reusable Concrete Building Structures
… components by implementing the existing external post-tensioning system in bridge structures and fiber reinforced system to design building beams and columns. This work presents an automated engineering design workflow for Pixelframe, including a engineering mechanics of the system that conforms …
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Strengthening of concrete members with advanced composite materials
… the first is by application of external post-tensioning using carbon fiber reinforced plastic (CFRP) cables, whereas the second is by bonding composite straps on the tension side of the members. In the first investigation, a total of twelve partially prestressed concrete beams were …
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Development of Improved Connection Details for Voided Slab Bridges
… shear key, thus removing the need for transverse post-tensioning. The tested connections employed alternate connection shapes and two different mix designs of fiber reinforced high strength concretes. The results showed that each tested connection outperformed the current detail. The findings of …
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