Monitoring of early stage prestress change of long span steam-cured concrete box girder with pretension method

2008 ◽  
Author(s):  
Geun-Yong Song ◽  
Su-Won Cha ◽  
Kyu-Yong Choi ◽  
Dong-Ok Kang
Keyword(s):  
Early Stage ◽  
Box Girder ◽  
Long Span ◽  
Concrete Box Girder

Research of Temperature Field of Long Span Concrete Box Girder Bridge Caused by Solar Radiation

2012 ◽  
Vol 256-259 ◽  
pp. 1635-1639
Author(s):  
Cun Ren Jiang ◽  
Jian Min Ren ◽  
Zhuo Ling Wang
Keyword(s):  
Temperature Field ◽  
Temperature Gradient ◽  
Solar Radiation ◽  
Structure Design ◽  
Box Girder ◽  
Qinghai Province ◽  
Long Span ◽  
Concrete Box Girder ◽  
Girder Bridge ◽  
Bottom Slab

When stimulate temperature field of concrete box girder caused by solar radiation with ANSYS, it’s feasible to turn boundary conditions to third boundary condition. Taking Ping'an Huangshui River Super-large Bridge in Qinghai Province for example, the research analyzes box girder temperature field distribution and deduces realistic temperature gradient mode by comparing calculations with measurements. Calculations show that bottom slab of box girder also has quite big temperature gradient which should be taken seriously in bridge structure design.

Spatial Stress Analysis of Long Span Prestressed Concrete Box Girder Bridges

2012 ◽  
Vol 256-259 ◽  
pp. 1693-1696
Author(s):  
Xian Lin Yu ◽  
Jian Shu Ye ◽  
Wen Qing Wu
Keyword(s):  
Prestressed Concrete ◽  
Shell Element ◽  
Box Girder Bridges ◽  
Box Girder ◽  
Girder Bridges ◽  
Long Span ◽  
Principal Tensile Stress ◽  
Concrete Box Girder ◽  
Concrete Box Girder Bridges ◽  
Spatial Stress

A FEA program using 8 nodes and 40 freedoms degenerated solid shell element was developed to analyze the spatial stress of long span prestressed concrete box girder bridges during construction stage and finished stage. The maximum principal tensile stress positions on box girder section and shear lag coefficient were researched according to spatial stress results. It presented suggestions on prestressed concrete box girder bridges anti-crack design.

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