scholarly journals Behavior of Strengthened Composite Prestressed Concrete Girders under Static and Repeated Loading

2017 ◽  
Vol 2017 ◽  
pp. 1-13
Author(s):  
Abbas AbdulMajeed Allawi
Keyword(s):  
Prestressed Concrete ◽  
Experimental Tests ◽  
Full Scale ◽  
Repeated Loading ◽  
Test Results ◽  
Concrete Girders ◽  
Load Carrying ◽  
Prestressed Concrete Girders ◽  
Aashto Lrfd ◽  
Analysis Models

The use of external posttensioning technique for strengthening reinforced concrete girders has been considerably studied by many researchers worldwide. However, no available data are seen regarding strengthening full-scale composite prestressed concrete girders with external posttensioned technique under static and repeated loading. In this research, four full-scale composite prestressed I-shape girders of 16 m span were fabricated and tested under static and repeated loading up to failure. Accordingly, two girders were externally strengthened with posttensioned strands, while the other two girders were left without strengthening. The experimental tests include deflection, cracking load, ultimate strength and strains at midspan, and loading stages. Test results were compared with the design expressions mentioned in AASHTO LRFD specifications and ACI 318-2014 code. Also, a nonlinear analysis was conducted using the finite element method (FEM). The presented analysis models were verified by comparing the model results with test results. The general theme abstracted from both experimental tests and numerical analysis reflects that the performance and procedure of strengthening with external prestressing of girders were found to be effective in increasing the load carrying capacity of the strengthened girders.

Strand Transfer Lengths in Full Scale AASHTO Prestressed Concrete Girders

PCI Journal ◽  
1992 ◽  
Vol 37 (3) ◽  
pp. 84-96 ◽  
Author(s):  
Mohsen A. Shahawy ◽  
Moussa lssa ◽  
Barrington deV Batchelor
Keyword(s):  
Prestressed Concrete ◽  
Full Scale ◽  
Strand Transfer ◽  
Concrete Girders ◽  
Prestressed Concrete Girders

Inspection and Analysis of Prestressed Concrete Girders Deteriorated by Alkali-Silica Reaction

2006 ◽  
Vol 302-303 ◽  
pp. 131-137
Author(s):  
Ting Yu Hao
Keyword(s):  
Prestressed Concrete ◽  
North China ◽  
Alkali Silica Reaction ◽  
Test Results ◽  
Railway Bridge ◽  
Alkali Content ◽  
Concrete Girders ◽  
The Future ◽  
Prestressed Concrete Girders

In-situ inspection and lab study were combined to analyze the prestressed concrete girders of an existing railway bridge built in 1976 in North China. The reactive components in aggregates and the alkali content of concrete were investigated. Typical reaction product was found in site and was analyzed in lab. Residual expansion of concrete cores drilled from some girders was measured. From test results, it can be deducted that alkali silica reaction had affected the concrete girders and would continue to cause expansion in the future.

scholarly journals Full-Scale Experimental Investigation of the Static and Dynamic Stiffness of Prestressed Concrete Girders

2019 ◽  
Vol 2019 ◽  
pp. 1-13
Author(s):  
Yongjun Zhou ◽  
Yu Zhao ◽  
Hengying Yao ◽  
Yuan Jing
Keyword(s):  
Prestressed Concrete ◽  
Flexural Rigidity ◽  
Dynamic Stiffness ◽  
Full Scale ◽  
Scale Model ◽  
Mode Shapes ◽  
Load Case ◽  
Concrete Girders ◽  
Scale Down ◽  
Prestressed Concrete Girders

Cracking damage influences the stiffness of the girders. Many articles in the literatures have studied the development of stiffness of the scale-down model; however, full-scale model testing cannot be completely replaced by scale-down testing because of material component characteristics and boundary effects. This paper deals with the effects of cracking damage on the structural static and dynamic stiffness based on three prestressed concrete (PC) girders which were removed from an old bridge. First, the equivalent flexural rigidity of cracked prestressed concrete girder was assessed using the measured load-deflection response under cycles of loading and unloading. Then, after unloading, the frequencies were measured on the PC girders supported by the elastomeric bearings. Next, the development of frequency under different damage was studied, and finally, the dynamic stiffness of PC girders with cracks was assessed. The results indicate that the first frequency is more sensitive to the cracking of concrete compared with the second frequency and that the mode shapes are not sensitive to girder damage. The test girders cannot be simplified as an ideal simply supported beam for the purpose of identifying frequencies. In addition, the “final” (the end of the ultimate load case) equivalent flexural rigidity of the girders is 30% of the “initial” (the beginning of the first load case) equivalent flexural rigidity, compared with 50% in the scale-down test; and the final dynamic stiffness is approximately 84% of the initial dynamic stiffness, whereas the scale-down test is 72%.

Proposed evaluation and repair procedures for precast, prestressed concrete girders with end-zone cracking

PCI Journal ◽  
2012 ◽  
Vol 57 (2) ◽  
pp. 94-119 ◽  
Author(s):  
Christie J. Hasenkamp ◽  
Sameh S. Badie ◽  
Kromel E. Hanna ◽  
Maher K. Tadros
Keyword(s):  
Prestressed Concrete ◽  
Concrete Girders ◽  
Prestressed Concrete Girders ◽  
Precast Prestressed Concrete

Experimental and analytical studies of prestressed concrete girders with corrugated steel webs

2014 ◽  
Vol 48 (8) ◽  
pp. 2505-2520 ◽  
Author(s):  
Xiao-Gang Liu ◽  
Jian-Sheng Fan ◽  
Jian-Guo Nie ◽  
Yu Bai ◽  
You-xu Han ◽  
...  
Keyword(s):  
Prestressed Concrete ◽  
Concrete Girders ◽  
Analytical Studies ◽  
Prestressed Concrete Girders
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