prestress


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prestress

[¦prē′stres]
(engineering)
To apply a force to a structure to condition it to withstand its working load more effectively or with less deflection.

prestress

1. The stress developed in prestressed concrete.
2. To apply loads to a structure or to a structural element for the purpose of beneficially modifying internal stresses.
References in periodicals archive ?
A series of experimental data show that there is a certain relationship between the prestress of the steel strand and the frequency of oscillation.
For PSC members, however, since the elastic deflection due to member weight at the release of the prestress, not at the standard age of 28 days, is multiplied by the long-time factor, the factor should be calculated considering the elastic modulus [E.sub.ci] at the time of release, not the elastic modulus [E.sub.c] at 28 days, as follows:
where [DELTA][[sigma].sub.l1] is the prestress loss associated with anchorage set (MPa), [[DELTA].sub.a] is the slip of the anchorage integrated from measured strains (mm), Ecf is the elastic modulus of the CFRP plate (MPa), and l is the CFRP length (mm).
Prestress effect was assigned for 2D plane stress elements.
Since prestressed NSMR introduces prestress to improve actively the performance based upon the behaviour of NSMR, its behaviour is closely related to that of NSMR.
In this section, in order to investigate the effect of prestress on the yield strength, ultimate strength and ductility of RC (reinforced concrete) beam, SRC (steel reinforced concrete) beam, and the changes of mechanical properties of beam after built-in H-steel, four same size numerical models were made, which are prestressed steel reinforced concrete (PSRC) beams, steel reinforced concrete (SRC) beams, prestressed reinforced concrete (PRC) beams, and reinforced concrete (RC) beams, and their mechanical properties were analyzed.
Segmentally erected prestressed bridges are becoming very popular for moderate spans all over the world (Ketchum, 1986).
As for the research of prestress anchor frame beam, it is mainly focused on prestress anchor mechanism, calculation method of frame beam internal force, and some field test research, but all these mainly aim at the internal force calculation of frame beam [1-5].
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.
Wave-prestress 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.
Arrangement of bases made of reinforced concrete prestressed slabs in accordance with the budget documentation (appendix no.