Design for Torsion and Shear in Prestressed Concrete Flexural Members

PCI Journal ◽  
2004 ◽  
Vol 49 (3) ◽  
pp. 34-42 ◽  
Author(s):  
Paul Zia ◽  
Thomas T. C. Hsu
Keyword(s):  
Prestressed Concrete ◽  
Flexural Members

Immediate Deflection of Partially Prestressed Concrete Flexural Members

2018 ◽  
Vol 115 (6) ◽  
Author(s):  
Peter Bischoff ◽  
Clay Naito ◽  
Joseph Ingaglio
Keyword(s):  
Prestressed Concrete ◽  
Flexural Members

Experimental Study on Bearing Properties of Self-Compacting Prestressed Concrete Beams

2010 ◽  
Vol 163-167 ◽  
pp. 918-927
Author(s):  
Wei Liu ◽  
Zhen Fu Chen
Keyword(s):  
Experimental Study ◽  
Prestressed Concrete ◽  
Concrete Beams ◽  
Experimental Studies ◽  
Concrete Structures ◽  
Flexural Members ◽  
Different Types

Five different types of self-compacting unbonded prestressed concrete beams are designed to study the bearing properties of self-compacting prestressed concrete flexural members. And experimental studies are conducted on their cracking loads, flexural strengths, ductility of members and failure forms. The testing results provide references for design and establishing related codes of self-compacting prestressed concrete structures.

Analysis of Ductility in Partially Prestressed Concrete Flexural Members

PCI Journal ◽  
1986 ◽  
Vol 31 (3) ◽  
pp. 64-87 ◽  
Author(s):  
Antoine E. Naaman ◽  
Muhamed H. Harajii ◽  
James K. Wight
Keyword(s):  
Prestressed Concrete ◽  
Flexural Members

Ductility of Reinforced and Prestressed Concrete Flexural Members

PCI Journal ◽  
1988 ◽  
Vol 33 (6) ◽  
pp. 94-107 ◽  
Author(s):  
Brian C. Skogman ◽  
Maher K. Tadros ◽  
Ronald Grasmick
Keyword(s):  
Prestressed Concrete ◽  
Flexural Members

ON THE REDUCTION OF PRESTRESSING FORCE NEAR SUPPORTS IN PARTIALLY PRESTRESSED CONCRETE FLEXURAL MEMBERS

2018 ◽  
Vol 5 (2) ◽  
Author(s):  
Nazar Oukaili
Keyword(s):  
Prestressed Concrete ◽  
Load Capacity ◽  
Compression Zone ◽  
Flexural Members ◽  
Tensile Stresses ◽  
Prestressing Force ◽  
Service Load ◽  
Bending Stresses ◽  
The Moment ◽  
Concrete Section

Straight tendons in pretensioned members can cause high-tensile stresses in the concrete extreme fibers at end sections because of the absence of the bending stresses due to self-weight and superimposed loads and the dominance of the moment due to prestressing force alone. Accordingly, the concrete tensile stresses at the ends of a member prestressed with straight tendons may limit the service load capacity of the member. It is therefore important to establish limiting zone in the concrete section within which the prestressing force can be applied without causing tension in the extreme concrete fibers. Two practical methods are available to reduce the stresses at the end sections due to the prestressing force. The first method based on changing the eccentricity of some tendons by raising them towards the end zone. The second method is based on bond prevention by encasing some of the tendons in plastic sheathing, effectively moving the point of application of prestressing force inward toward midspan for part of tendons. The present study focuses on a proposed third method to reduce the effect of the prestressing force near end supports by using straight strands with limited initial prestressing value in compression zone. New equations were suggested for the cracking moment and the prestressing force which consider the prestressed tendons in compression zone.

Review of prestressed concrete technology in flexural members

2014 ◽  
pp. 335-337
Author(s):  
Yixiang Yin ◽  
Yuanbing Cheng ◽  
Zilong Guo ◽  
Guanghua Qiao
Keyword(s):  
Prestressed Concrete ◽  
Concrete Technology ◽  
Flexural Members

scholarly journals Automation of the evaluation of bonded and unbonded prestressed concrete beams, according to brazilian and french code specifications

2013 ◽  
Vol 6 (1) ◽  
pp. 13-54
Author(s):  
P. M. Lazzari ◽  
A. Campos Filho ◽  
F. P. S. L. Gastal ◽  
R. A. Barbieri ◽  
R. C. Schwingel
Keyword(s):  
Prestressed Concrete ◽  
Geometric Nonlinearity ◽  
Computational Algorithm ◽  
Concrete Beams ◽  
Limit State ◽  
Ultimate Limit State ◽  
Flexural Members ◽  
Design Procedures ◽  
Planar Frames ◽  
Ultimate Limit

This paper presents a suggestion for the automation of the design procedures of bonded and unbonded prestressed concrete flexural members, according to the Brazilian (NBR 6118:2007) and French (Règles BPEL 91) norm specifications. Prestressing of concrete structures has been increasingly used, mainly due to its building advantages, as well as allowing reducing crack incidence and element dimensions by the use of more resistant materials. Structure is analyzed by a numerical model that employs a hybrid type finite element for planar frames, considering geometric nonlinearity, cyclic loading and composite construction. The computational algorithm implemented considers full, partial and limited prestressing situations, evaluating in each case decompression limit state, limit state of cracking, ultimate limit state and final prestressing state. Finally, two examples comparing design situations according to the Brazilian and French norms are presented.

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