Results 211 to 220 of about 8,557 (257)

Effect of Non-Prestressed Steel on Prestress Loss and Deflection

PCI Journal, 1977
A simple accurate method is presented for calculating prestress loss, axial strain, and curvature at a cross section of a member containing prestressed as well as nonprestressed steel. Two sets of graphs are given as design aids, and their use is demonstrated by numerical examples.
Maher K. Tadros, Amin Ghali, Walter H. Dilger   +2 more
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Partial Loss of Prestress

2018
Prestressing a concrete member effectively applies a substantial axial force to the member that is in place for its entire service life. In both pretensioned and post-tensioned methods of prestressing, this prestressing force begins to decline immediately upon its application and continues to decline throughout its service life. This reduction in force
Charles W. Dolan, H. R. Hamilton
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Losses in partially prestressed concrete

Canadian Journal of Civil Engineering, 1988
The calculation of prestress losses by the age-adjusted effective modulus method is analyzed and compared with the Ontario highway bridge design code predictions for partially prestressed concrete. Specifically, the effect of nonprestressed reinforcement on prestress losses is studied.
B. DeV. Batchelor, Jayanth Srinivasan, Mark F. Green   +2 more
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Prestress Losses in Partially Prestressed High Strength Concrete Beams

PCI Journal, 1993
The results of a comprehensive parametric study on prestress losses in prestressed and partially prestressed high strength concrete beams are reported. Attention is focused on the influence of the partial prestressing ratio (from no prestressing to full prestressing) and the compressive strength of concrete, from 6 ksi (41 MPa) up to 10 ksi (69 MPa ...
Antoine E. Naaman, Ali M. Hamza
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UNDERSTANDING THE LOSSES IN PRESTRESSING

PCI Journal, 1969
LOSSES THAT OCCUR IN PRESTRESSED CONCRETE AND ATTEMPTS TO PLACE THEM IN PROPER PERSPECTIVE TO EACH OTHER ARE DISCUSSED. LOSS OF PRESTRESS DUE TO RELAXATION OF STEEL, SHRINKAGE, ELASTIC DEFORMATION AND CREEP IN THE CONCRETE, ANCHORAGE SLIP AND TENDON FRICTION ARE DISCUSSED; METHODS OF EVALUATING THESE LOSSES ARE PRESENTED.
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A Probabilistic Comparison of Prestress Loss Methods in Prestressed Concrete Beams

PCI Journal, 2004
Camber and long-term deflections are directly linked to the loss of prestressing force, a characteristic of all prestressed concrete members. In this investigation, the effects of the inherent variability of the parameters used to estimate prestress loss was studied for two typical bridge beam cases using several prestress loss predictive methods at ...
Christopher G. Gilbertson, Theresa M. (Tess) Ahiborn   +1 more
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Analysis of Prestressing Loss on Construction of External Prestressed Wooden Buildings

Advanced Materials Research, 2012
Wooden buildings which has a long history, is one of the earliest forms of building structures by mankind.The structure form and construction method of are different from the common prestressed structure,therefore,the prestressing loss caused by the external prestressed structures is different from that of the common prestressed structure.It is an ...
Ji Mei Zhang, Jing Long Pan, Hong Bo Dong   +2 more
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Applying Prestressed CFRP Sheets to Restore Prestress Losses in Prestressed Concrete Beams

SP-245: Case Histories and Use of FRP for Prestressing Applications, 2007
This paper has described how the issue of the rehabilitation of damaged structures has attracted the attention of researchers in order to resolve the undesired problems caused by increased traffic loads, corrosion, or impact damage. Appropriate methods are therefore essential for extending the lifespan of the structures and the application of carbon ...
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Loss of Prestress, Deflection, and Partial Prestress

1990
This chapter includes discussions of several important, frequently encountered subjects that pertain to the elastic design of simple prestressed concrete flexural members. An engineer who frequently is engaged in the design of prestressed structures will become familiar with these relationships through design experience.
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The effect of prestress losses on the seismic response of prestressed concrete frames

Computers & Structures, 1996
An analytical model for predicting the dynamic response of prestressed concrete frames was presented recently. According to this model, the effect of prestress losses on the seismic response of prestressed concrete frames is studied in this paper. The results indicate that the ductility factor and ductility demand increase with decreasing prestress ...
Mo, Y. L., Hwang, W. L.
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