Uncertainty and updating of long-term prediction of prestress forces in PSC box girder bridges

2005 ◽  
Vol 83 (25-26) ◽  
pp. 2137-2149 ◽  
Author(s):  
In Hwan Yang
Keyword(s):  
Box Girder Bridges ◽  
Box Girder ◽  
Girder Bridges ◽  
Term Prediction ◽  
Long Term Prediction

NC-UHPC Composite Structure for Long-Term Creep-Induced Deflection Control in Continuous Box-Girder Bridges

2018 ◽  
Vol 23 (6) ◽  
pp. 04018034 ◽  
Author(s):  
Yang Zhang ◽  
Ping Zhu ◽  
Yanping Zhu ◽  
Chao Bao ◽  
Xudong Shao ◽  
...  
Keyword(s):  
Composite Structure ◽  
Box Girder Bridges ◽  
Box Girder ◽  
Girder Bridges ◽  
Term Creep

Effect of Pier Vertical Deformations on Deflections of Main Girders for High Pier and Long-Span Continuous Rigid-Frame Bridges

2010 ◽  
Vol 163-167 ◽  
pp. 1436-1439
Author(s):  
Jin Sheng Du ◽  
Hai Bin Liu
Keyword(s):  
Prestressed Concrete ◽  
Short Term ◽  
Box Girder Bridges ◽  
Box Girder ◽  
Girder Bridges ◽  
Long Span ◽  
Concrete Box Girder ◽  
Concrete Box Girder Bridges ◽  
Main Girder

In some long-span prestressed concrete box girder bridges, excessive deflections of main girders are often observed. These unacceptable deflections have detrimental influence on the serviceability and safety of the structures. To better understand and estimate short term and long term deflections for prestressed concrete box girder bridges, pier vertical deformation and its effect on deflections of main girders of Jinghe Bridg is investigated in this paper. Piers in Jinghe Bridge are tall and the difference in height between piers up to 22 m. Analysis indicates that although the short term deformations of piers are small, the long term deformations of piers can be 3 times as large as that of short-term ones. The maximum short-term downward deflection of Jinghe Bridge caused by pier deformation for main girders is 7.7 mm and the maximum long-term downward deflection is 33.3 mm. These values are relatively small compared with the span length of the bridge. But when the deflection of the main girder itself is also included, the final total deflection of the main girder may exceed the design code limit.

Effect of Shear Lag on the Long-Term Performance of Long-Span PC Box Girder Bridge

2011 ◽  
Vol 255-260 ◽  
pp. 1290-1294 ◽  
Author(s):  
Yan Wei Niu
Keyword(s):  
Prestressed Concrete ◽  
Three Dimensional ◽  
3D Analysis ◽  
Shear Lag ◽  
Box Girder Bridges ◽  
Box Girder ◽  
Girder Bridges ◽  
Long Span ◽  
Girder Bridge

The analysis and mechanism of excessive long-term deflection of long-span prestressed concrete (PC) box girder bridges is concentrated recently. However, because of the lack of computing method, three dimensional (3D) analysis of PC continuous bridge especially including long-term shear lag effect is hard to analyze. According to this, a 3D creep analysis method for long-span PC bridges is illustrated in this paper first. The shear lag analysis of loads, prestress and their combination effect is carried out respectively. Based on this, the effect of shear lag to the long-term deflection of mid-span and whole-shape of the bridge is demonstrated. At the end, the different of computing between analysis with or without considering shear lag is discussed and some suggestion is proposed.

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