Flexural Behavior of Slender Post-Tensioned Masonry Walls
The 2002 edition of the Masonry Standards Joint Committee (MSJC, 2002) design provisions for masonry structures includes a chapter on the design of post-tensioned masonry (PTM) walls with...
Enduring Strength
The long-term effectiveness of posttensioning in bridges depends on the resiliency of the tendons, and various factors related to construction and marine environments come into play. How...
Translucent Structural Beacon
In East Los Angeles some 2,000 children, teens and adults are accessing their future inside a building that is as high-tech as the computers they are using to learn. The 40,000 sq ft building...
Monitoring Prestressed Structures
Developments in remote-monitoring technology provide new options for cost-effective management of prestressed and post-tensioned reinforcement systems. A case study shows how engineers...
Parking Lot Corrosion Cure
The $3 million structural repair and restoration of a large post-tensioned parking structure required engineers to replace 2,400 tendons while keeping the parking garage in service. After...
Anchorage of Non-Metallic Prestressing Tendons
Experimental confirmation tests were conducted to evaluate mechanical and epoxy socketed anchors for fiber reinforced plastic (FRP) prestressing tendons. The studies found that a parabolically...
Impact of Non-Gaussian pdf on Reliability Estimates for Deep Water Platforms
The offshore community has invested a great deal in the analysis and design of compliant deep water platforms such as tension leg platforms (TLPs) and more recently spar platforms. Tension...
How to Optimize Prestressed Concrete Systems?
Three common problems of prestressed concrete optimization, that involve only a single structural analysis and can readily be solved by available programs, are presented: 1. The problem...
Bonded Tendon Debate
Bonded tendons�currently banned in bridge construction in the United Kingdom because of corrosion concerns�are getting a bum rap, says the author. Corrosion protection details of most...
Plastics Composites for 21st Century Construction
This proceedings,
Optimal Control Configuration for Active Control of Structural Vibrations
An active tendon control mechanism is used to control the vibrations of a bridge-like structure. A single control force controls three modes of vibrations. Special attention is paid to...
Synthesis of Lateral Structural Bracing with Active Tendons
The idea of combining X bracing, viscoelastic dampers, and active tendons in a structure which has been optimized for gravity loads is presented. It is shown that reduction of the structure's...
Reliability and Redundancy Assessment of Prestressed Truss Bridges
Methods for the assessment of the reliability and redundancy of post-tensioned trusses are suggested. The effect of tendon layout on the reliability and redundancy of post-tensioned trusses...
Forces in Unbonded Tendons
A rational analysis procedure for the calculation of tendon forces in prestressed beams with unbonded tendons is discussed. The prestressing tendon is analyzed as a tight-string which...
Post-Tensioned Transportation
Post-tensioned highways are relatively new. U.S. 220 near Altoona, Pa. has the first major installation in the country. There two miles of pavement are continuous concrete panels, each...
Unbonded Performance
Unbonded single strand tendons have been used in the U.S. for about 30 years. In a small number of buildings, strand corrosion failures have occurred. Although it is clear that post-tensioning...
Swiss Cheese Box Girders
Now going up in the French Alps, the Sylans and Glacieres viaducts have decks supported by three-dimensional arrays of concrete trusses. The superstructures look like concrete box girders...
Rehab Roundup
Four recent rehabilitation projects are described. On an old concrete gravity dam, post-tensioning tendons were added to improve its resistance to sliding. The abandoned Union Station...
Nonlinear Analysis of External Prestressed Bridges
Finite element formulations for analysis of the overall response of concrete bridge girders prestressed with external tendons is described. The analytical procedure includes several nonlinear...
Optimal Control of Seismic Structures
This paper presents the algorithm for optimal design of structural systems with active tendon controllers and/or active mass dampers. The structure is subjected to earthquake excitation...
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