scholarly journals CFRP-Strengthening and Long-Term Performance of Fatigue Critical Welds of a Steel Box Girder

Polymers ◽  
2014 ◽  
Vol 6 (2) ◽  
pp. 443-463 ◽  
Author(s):  
Roland Koller ◽  
Iwan Stoecklin ◽  
Sebastian Valet ◽  
Giovanni Terrasi
Keyword(s):  
Box Girder ◽  
Steel Box Girder ◽  
Long Term Performance ◽  
Term Performance

The investigation and proposed rehabilitation of the Tsing Yi South Bridge, Hong Kong

1988 ◽  
Vol 15 (2) ◽  
pp. 190-198
Author(s):  
A. S. Beard ◽  
H. S. S. Tung
Keyword(s):  
Prestressed Concrete ◽  
Load Testing ◽  
Concrete Core ◽  
Box Girder ◽  
Expansion Joints ◽  
Radiographic Inspection ◽  
Core Extraction ◽  
Long Term Performance ◽  
Term Performance

The Tsing Yi South Bridge was constructed in the early 1970s to provide access between Tsing Yi Island and the mainland at Kwai Chung. It has a prestressed concrete box girder superstructure consisting of five independent units which are monolithic with their piers and have expansion joints at the mid-span shear hinges and the abutments. During routine maintenance it was found that the superstructure cantilevers were deflecting excessively, and consequently a thorough inspection and appraisal were commissioned. These included a complete visual inspection, concrete core extraction, radiographic inspection of prestressing tendons and a programme of load testing. The bridge was also reanalyzed to check its long-term performance. Subsequently, a rehabilitation scheme was designed to recover part of the deflection. This involved the introduction of additional prestress near the box girder's top flange. Key words: prestressed concrete, structural assessment, creep, shrinkage, radiographic inspection, rehabilitation, external prestressing.

Long-Term Performance of Concrete Suffered Infant Age Freezing

2012 ◽  
Vol 174-177 ◽  
pp. 524-529 ◽  
Author(s):  
Bao Lin Guo ◽  
Chang He Yu ◽  
Yu Han ◽  
Ju Peng Zhu
Keyword(s):  
Calcium Carbonate ◽  
Cross Section ◽  
Box Girder ◽  
Cover Concrete ◽  
Concrete Quality ◽  
Complicated Process ◽  
Long Term Performance ◽  
Term Performance ◽  
The Web

Interior water migrated towards the surface area when concrete suffered minus temperature during infant ages. Cover concrete became the worst part after the complicated process of water freezing – thawing, intermittent hydration of cementious materials and volatilization. Presentation quality, carbonization depth and rebound value in 120 d ages were observed and tested in situation. There were some calcium carbonate stains spread over the web, many swelling points and radial ice lens spread over the surface of box girder. The carbonization depth was over 10mm, and the rebound value of web concrete lower than 50, some areas’ lower than 35, variance larger than 30. Compared with other parts, the rebound value of web bottom concrete was the lowest and the variance biggest. For the same cross section, there were obviously difference of concrete quality between sunny face and shady ones, which enhanced the un-uniformity of element and made the stress distribution more complicated and uncertainty. Some effective measures must be taken to avoid the infant age frozen in order to assure the concrete quality constructed during the winter.

Long-Term Performance of a Curved Box Girder Viaduct

2021 ◽  
Vol 35 (1) ◽  
pp. 04020135
Author(s):  
Yang Zhou ◽  
Carnot Nogueira ◽  
Kevin Rens ◽  
Chengyu Li
Keyword(s):  
Box Girder ◽  
Long Term Performance ◽  
Term Performance

Long-Term Performance of Steel-Concrete Composite Box Girder

2013 ◽  
Vol 838-841 ◽  
pp. 653-656
Author(s):  
Xiao Jie Liu ◽  
Ya Peng Jiang
Keyword(s):  
Initial Time ◽  
Time Varying ◽  
Box Girder ◽  
Stress And Deformation ◽  
Long Term Performance ◽  
Term Performance

In this paper, an analytical example was given to show the time-varying regularity of stress and deformation of composite box girder. The distribution of deflection along the span at initial time and ultimate time was calculated. It was found that the mid-span deflection increased rapidly during the initial 50 days, and became stable after 300 days. The stress of steel increased while the stress of concrete decreased and both of the variation rates gradually slowed down with time. The regularity of stress of steel and concrete with time are similar to that of the mid-span deflection.

Fine Particle Mass Monitoring with Low-Cost Sensors: Corrections and Long-Term Performance Evaluation

2019 ◽  
Author(s):  
Carl Malings ◽  
Rebecca Tanzer ◽  
Aliaksei Hauryliuk ◽  
Provat K. Saha ◽  
Allen L. Robinson ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Fine Particle ◽  
Low Cost ◽  
Particle Mass ◽  
Long Term Performance ◽  
Term Performance

Long-term performance of the Hancock bioprosthetic conduit for aortic root replacement

2008 ◽  
Vol 56 (S 1) ◽  
Author(s):  
CC Badiu ◽  
W Eichinger ◽  
D Ruzicka ◽  
I Hettich ◽  
S Bleiziffer ◽  
...  
Keyword(s):  
Aortic Root ◽  
Aortic Root Replacement ◽  
Long Term Performance ◽  
Term Performance
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