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Showing 1 to 20 of 52 for “"post-tensioned"”.
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Inspection of Flexible Fillers in Post-Tensioned Bridges
… toward the use of flexible fillers (FF) in new post-tensioned (PT) bridges. Flexible fillers have several advantages compared to the currently used cementitious grouts (CG) and can offer longer-lasting structures by providing better corrosion protection and allowing for replaceable tendons, …
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Time-dependent losses in post-tensioned prestressed concrete
An investigation has been undertaken into the factors affecting the time-dependent deformations, prestress losses and deflections of Class 1 uncracked prestressed concrete beams. The main influencing factors considered were environmental conditions, loading conditions,size and shape of members and …
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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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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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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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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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Design of a cable-stayed precast post-tensioned box girder bridge
… of current practice in the field of cable-stayed post-tensioned precast box girder technology and construction is presented. Likewise, a preliminary design for a 600 foot main span cable-stayed post-tensioned box girder bridge is presented. The analysis considers dead load, and live loadings …
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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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Time-Dependent Behavior of Noncomposite and Composite Post-Tensioned Concrete Girder Bridges
Made available in DSpace on 2014-12-13T19:31:34Z (GMT). No. of bitstreams: 1 7708986.pdf: 13239689 bytes, checksum: d8b3845b2959497ec2c2907215386015 (MD5) Previous issue date: 1976
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Strength and Performance of Steel Fiber Reinforced Concrete Post-Tensioned Flat Plates
… scale model steel fiber reinforced concrete post-tensioned flat plate. The specimen had nine 10ft x 10ft x 3in. bays along with a 2ft-6in. overhang. Distributed loading was applied with a whiffle tree loading system at each bay and overhang section. Throughout the test, crack widths, crack …
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Performance of Steel Fiber Reinforced and Conventionally Reinforced Post-Tensioned Flat Plates
… need for commercial and residential buildings, post-tensioned (PT) flat plates have become a preferred choice for floor systems, because of the numerous advantages over non-prestressed slabs such as better efficiency, reduced slab self-weight, as well as crack and deflection control. To improve …
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Ultimate Bearing Strength of Post-tensioned Local Anchorage Zones in Lightweight Concrete
Currently, NCHRP Report 356 has published an equation to estimate the ultimate strength of the local zone in normal weight concrete. The local zone is the area of concrete directly ahead of the bearing plate. The equation can be broken into two distinct parts: unconfined bearing strength of …
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Ultrasonic NDT Methods for the Evaluation of Post-Tensioned Systems with Flexible Fillers
<p>Non-destructive evaluation of post-tensioned structures with flexible fillers is desperately needed due to their rapid implementation in the State of Florida, primarily in roadway structures. This study provides an overview of existing evaluation methods for traditional post-tensioned structures …
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Linear and Nonlinear Finite Element Analyses of Anchorage Zones in Post-Tensioned Concrete Structures
Linear and nonlinear finite element analyses are used for the investigation of rectangular anchorage zones with the presence of a support reaction. The investigation is conducted based on four load configurations consisting of concentric, inclined concentric, eccentric, and inclined eccentric …
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Investigation of the Time-Dependent Longitudinal Flexural Behavior of the Varina-Enon Bridge
Post-tensioned concrete is a building technology which provides a compressive force to concrete via steel tendons. This combination of steel and concrete allows for the construction of lighter and stiffer structures. Post-tensioned concrete is widely utilized throughout the United States highway …
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