pe]--effective stress transferred to the pretensioned member (which considers the prestress
losses due to elastic shortening, conditioned by the concrete's modulus of elasticity).
At an approximate contract value of $570,000, Oldcastle Precast - Central Pre-Mix Prestress
manufactured and delivered the prestressed
concrete Super Girders: (5) five Super Girders at 157'-8” long; (5) five Super Girders at 154'-8” long and (5) five Super Girders at 170'-2” long.
The experimental program was developed with two main objectives: to study the time evolution of the prestress
applied to the structure and to verify the bridge structural behavior under the action of loads simulating the action of a vehicle.
and wave-material interactions are described for nonlinear propagation of longitudinal waves in materials (i) with inhomogeneous prestress
and (ii) with weakly variable physical properties.
DETERMINATION OF SHORT-TERM AND LONG-TERM PRESTRESS
Having evaluated prestress
losses, the cracking moment of 8.
The average loss of prestress
following release of the clamps due to camber was 16.
As a result of the consolidation agreement, United Concrete Products will now offer clients an expanded product portfolio that features precast, prestress
, pipe and pile services.
This research should include instrumenting long-span precast pretensioned girders during all phases of fabrication and construction and comparing the measured strain at the end zones, prestress
losses, deflections, and cambers with the calculated values.
The aim of this study was to examine the influence of the prestress
of the center pole on the displacements of treads to see if it was a determining factor for the behavior of the stair.
Agencies can realize further benefits by incorporating prestress
(in the form of pretensioning or posttensioning) into the precast panels.
In the first mechanism, the stress variation can lengthen the debonded surfaces of strands adjacent to the crack surfaces, reducing available prestress
in other sections and initiating additional flexural cracks on either side of existing cracks.