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...
TLP Tendon Analysis
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...
An Experimental Study of Active Structural Control
An experimental investigation is made concerning the possible application of active control to structures under seismic excitation. The experimental facilities and structural model are...
Optimum Seismic Structural Design with Tendon and Mass Damper Controls and Random Process
This paper describes the optimization of structural weight for seismic structures implemented by active control systems. The instantaneous open-loop optimal control algorithm is used for...
Inelastic Behavior of Continuous Prestressed Steel Girders
Tiebacks for Waterfront Bulkheads
Olmos Dam Modifications
(
Protecting Post-Tensioning Tendons in Concrete Structures
Patterns of corrosion problems related to tendon systems are analyzed based on the author's experience in evaluating over 50 corrosion related performance problems in prestressed...
Optimal Open-Loop Critical-Mode Control of Building Structures Under Earthquake Excitation
Grouting of Post-Tensioning Tendons
Dam Anchored to Foundation to Withstand Floods
Federal Power Commission Order No. 315 required a safety review of Conowingo Dam and Powerhouse by an independent board of consultants. As recommended by this board, a study was made of...
Active Tendon Control of Slender Structures
Return to search