Study on Influence of Temperature to Section Deformation of Steel Box Girder during Cantilever Installation

Because of solar radiation and the atmospheric temperature rise, the temperature change of the steel box girder bridge be larger. Thermal conductivity and sensitivity to the temperature change of steel is very good. The impact of temperature effect can be compared with the dead and live load under certain circumstances. Taking a bridge as example, the relative deformation of flat steel box-shaped girder is analyzed with the finite element analysis software. The results can be reference for other bridges.

Download Full-text

Research on Integral Lifting Continuous Steel Box Girder Bridge Construction Technology

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.256-259.1674 ◽

2012 ◽

Vol 256-259 ◽

pp. 1674-1681

Author(s):

Hong Zhang ◽

Yong Tao Zhang ◽

Hao Zhu ◽

Ji Bin Gao

Keyword(s):

Optimization Design ◽

Water Environment ◽

Construction Technology ◽

Element Analysis ◽

Box Girder ◽

Large Segment ◽

Steel Box Girder ◽

Bridge Steel ◽

Girder Bridge ◽

Steel Box Girder Bridge

Due to over length and weight of the girder segment, the main bridge steel box girder of Chongqi Bridge adopts large segment integral lifting erection method; two sets of large floating cranes are needed for hoisting. According to the water environment condition at site, select the lifting equipments to research on; conduct restrict checking on the lifting weight, height and amplitude; new automatic balance type lifting sling structure form is adopted during lifting erection to make sure the stress on each lifting point is balanced; conduct optimization design onto the lifting points; aimed at lifting erection of large segments, use ansys to establish large solid simulation model for finite element analysis so as to guarantee safety of steel box girder structure during lifting erection of large segment.

Download Full-text

Crack Detection by Static Measurement in Steel Beams

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.321-323.394 ◽

2006 ◽

Vol 321-323 ◽

pp. 394-399

Author(s):

Philip Park ◽

Yong Hak Huh ◽

Dong Jin Kim ◽

Byung Jik Son

Keyword(s):

Crack Detection ◽

Quantitative Relationship ◽

Crack Size ◽

Steel Beams ◽

Element Analysis ◽

Box Girder ◽

Static Measurement ◽

Steel Box Girder ◽

Girder Bridge ◽

Steel Box Girder Bridge

Effects of crack on static behavior in steel box girder were investigated to identify the possibility of crack detection and location using conventionally measured static data including deflection and inclination. Finite element analysis with finely meshed 3-D models and experiments were performed for steel box girder with crack. To eliminate the variation according to load magnitude, compliance technique was applied to analysis of the result. Through this study, the quantitative relationship between crack size and structural responses of deflection and inclination were obtained as a form of relation-curve. This relation-curve can be utilized to evaluate crack size in the steel box girder bridge. The results also demonstrated that the location of crack can be estimated by static measurement.

Download Full-text