scholarly journals Ductility of prestressed concrete members

1971 ◽  
Vol 4 (1) ◽  
pp. 145-170 ◽  
Author(s):  
R. W. G. Blakeley ◽  
R. Park
Keyword(s):  
Prestressed Concrete ◽  
High Intensity ◽  
Concrete Beam ◽  
Analytical Determination ◽  
Prestressing Steel ◽  
Concrete Members ◽  
Load Factors ◽  
The Moment ◽  
Reinforcement Distribution

An analytical determination of the moment-curvature relationships of prestressed concrete members under high intensity monotonic loading is presented, and compared with experimental results. The effects on ductility of such variables as transverse reinforcement, distribution of the prestressing steel within the section, steel area ratio, and axial load are described. A comparison is made of the ductility available in comparable prestressed and reinforced concrete members. The results of tests on prestressed concrete beam-column assemblies under high intensity cyclic loading are referred to and conclusions are drawn on the seismic resistance of prestressed concrete members. Load factors for seismic design are discussed.

scholarly journals Indirect Determination of Residual Prestressing Force in Post-Tensioned Concrete Beam

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1338
Author(s):  
Jakub Kraľovanec ◽  
Martin Moravčík ◽  
Petra Bujňáková ◽  
Jozef Jošt
Keyword(s):  
Prestressed Concrete ◽  
Concrete Beam ◽  
Load Test ◽  
Material Behavior ◽  
Nonlinear Material ◽  
Significant Deterioration ◽  
Indirect Determination ◽  
Prestressing Force ◽  
Post Tensioned

A diagnostic survey on the precast prestressed bridge Nižná confirmed significant deterioration due to environmental distress. Evidently, decisive failures of the structure have a similar character as in the previous precast prestressed bridge in Podbiel in the northern part of Slovakia. These failures result from the unsuitable concept of the first generation of precast prestressed concrete beams, which was used in the former Czechoslovakia in the second half of the 20th century. Subsequently, experimental verification using the proof-load test was also executed. This bridge was built in 1956, so at the time of testing, it was 60 years old. The paper presents the indirect determination of prestressing level in one precast post-tensioned concrete beam using the saw-cut method. Experimental measurement was executed during the bridge demolition. Subsequently, a 2D numerical model in ATENA 2D Software, with the assumption of nonlinear material behavior for verification of experimental results, was performed. Finally, the residual prestressing force was evaluated and compared with the expected state of prestressing according to Eurocodes after 60 years of service.

scholarly journals Theorisation of structural behavior with a view to defining resistance and ultimate deformability

1973 ◽  
Vol 6 (2) ◽  
pp. 52-70 ◽  
Author(s):  
R. Park
Keyword(s):  
Reinforced Concrete ◽  
Prestressed Concrete ◽  
High Intensity ◽  
Structural Behavior ◽  
Future Research ◽  
Plastic Range ◽  
Theoretical Methods ◽  
Theoretical Investigations ◽  
Reversed Loading ◽  
The Moment

This report reviews theoretical investigations which have been conducted to determine the behaviour of reinforced concrete, prestressed concrete and structural steel elements subjected to well defined repeated and reversed loading of high intensity. It commences with a brief summary of the stress-strain characteristics of the materials under such loading in the plastic range and then reports on theoretical methods for determining the moment-curvature and load-displacement characteristics of the members. Some consideration is also given to complete structures. Areas where future research is necessary are indicated.

The Influence of Wire Type Indentation on Longitudinal Splitting in Pre-Stressed Concrete

2021 ◽  
Vol 1165 ◽  
pp. 65-86
Author(s):  
Adrijana Savić ◽  
Aref Shafiei Dastgerdi ◽  
Robert J. Peterman ◽  
B. Terry Beck
Keyword(s):  
Prestressed Concrete ◽  
State University ◽  
Longitudinal Splitting ◽  
Prestressing Steel ◽  
Concrete Members ◽  
Concrete Mixtures ◽  
Pretensioned Concrete ◽  
Different Types ◽  
Compressive Strength Of Concrete ◽  
Kansas State University

The important characteristic in the creation of longitudinal splitting cracks in pretensioned concrete members has found to be the geometry of the pre-stressing wire indents. Longitudinal splitting along prestressing tendons can result in severe splitting of prestressed member in the field under loading over time. The research evaluated the influence of wire type indentation on the longitudinal splitting in prestressed concrete members fabricated with different concrete mixtures and different compressive strength of concrete. A key objective was to find the best type of wire to avoid failures in the field. A study was conducted at Kansas State University to understand the effect of wire type on the longitudinal splitting between prestressing steel and prestressed concrete. Three different types of wires will be presented in this paper denoted as “WB”, “WF” and “WQ”. The wires have different parameters which include indent depth, indent width, indent sidewall angle, indent pitch and indent volume.

scholarly journals Behaviour of a prestressed concrete interior beam-column assembly under cyclic loading

1973 ◽  
Vol 6 (4) ◽  
pp. 158-169
Author(s):  
R. Park ◽  
K. J. Thompson
Keyword(s):  
Prestressed Concrete ◽  
Concrete Beam ◽  
Seismic Load ◽  
Research Association ◽  
Concrete Frames ◽  
Building Frames ◽  
Framed Structures ◽  
Prestressing Steel ◽  
Concrete Building ◽  
The University

The University of Canterbury is at present conducting an experimental investigation into the seismic resistance of concrete building frames. This research project is sponsored by the N.Z. Prestressed Concrete Institute, the Building Research Association (N.Z.) and the University. The test frames will include a range of proportions of prestressing steel
and ordinary reinforcing steel to allow a comparison of prestressed and reinforced concrete frames and to establish the possible advantages of combining both systems. The tests are aimed at determining the deformation capacity and degree of damage of such frames when responding to severe seismic load
reversals and will establish further basic information for the evaluation and design of framed structures for earthquake resistance. Testing of the first test specimen has been completed. The specimen (Unit 1) consisted of
a beam-column assembly with a prestressed concrete beam. After testing under very severe seismic type loading the damaged concrete was repaired and the assembly retested. This
 report summarizes the results obtained from
the tests on that specimen.

scholarly journals Prestressed concrete seismic design

1973 ◽  
Vol 6 (1) ◽  
pp. 2-21
Author(s):  
R. W. G. Blakeley
Keyword(s):  
New Zealand ◽  
Seismic Design ◽  
Prestressed Concrete ◽  
Structural Elements ◽  
Design Practice ◽  
Concrete Frames ◽  
Concrete Members ◽  
Load Factors ◽  
Seismic Resistant ◽  
Inelastic Seismic Response

The approach of design and research engineers to the use of prestressed concrete in primary seismic resistant structural elements is reviewed. Some results of recent research into the ductility of prestressed concrete members and the inelastic seismic response of prestressed concrete frames are presented. Also, the principles and recommendations of
the FIP-CEB and others for seismic resistant design are given and current New Zealand
design practice is summarised. Finally, the question of suitable load factors for pre-stressed concrete structures is discussed.

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