Analysis of Eccentric Load Causing Torsion Effects of Variable Cross-Section Continuous Box Girder during Cantilevered Casting

2012 ◽  
Vol 446-449 ◽  
pp. 1194-1198
Author(s):  
Min Xiang ◽  
Cong Juan Yang
Keyword(s):  
Cross Section ◽  
Variable Cross Section ◽  
Variable Cross ◽  
Construction Process ◽  
Analysis Model ◽  
Box Girders ◽  
Eccentric Load ◽  
Box Girder ◽  
Continuous Beam Bridge ◽  
Beam Bridge

The construction with hanging basket eccentric loading was studied for the cantilever casting of a 32m +48 m +32 m continuous box girder. The calculation of center deflecting angles of cantilever box girders with variable cross-section due to pure torsion was derived, and correspondingly a program was developed to calculate this formula. An analysis model of cantilever casting continuous beam bridge with hanging basket eccentric loading was established based on finite elements software, and the shear stress, the longitudinal normal stress and the combined stress of different section were analyzed under different construction process. The torsional effect due to hanging basket eccentric loading was studied and the results are helpful to guide the construction in practice.

Stability Analysis of Single-Pier Variable Cross-Section Box-Girder Continuous Bridge

2014 ◽  
Vol 989-994 ◽  
pp. 923-926
Author(s):  
Guan Sheng Yin ◽  
Jie Bai ◽  
Jun Jie Feng
Keyword(s):  
Cross Section ◽  
Variable Cross Section ◽  
Variable Cross ◽  
Lateral Stability ◽  
Eccentric Load ◽  
Box Girder ◽  
Factors Affecting ◽  
Safety Coefficient ◽  
Future Design ◽  
Transverse Stability

On the basis of Umansky box-girder torsion theory, the software of ANSYS is applied to simulate related engineering model. In considering a variety of live load conditions, the lateral stability of multi-span single-pier variable cross-section box-girder under torsion eccentric load is analyzed. Analysis results reveal that under different working conditions, the factors affecting the transverse stability of the bridge and the proportion of the value on each, such as gravity, the span ratio and the distance between support are different; When the overload ratio is 2 times larger, the bridge stability safety coefficient decreases along the curve and changes rapidly. In the future design of this kind of bridge, the overall lateral stability should be paid much more attention. Some methods and suggestions about how to prevent the emergence of security and stability problems are put forward in the end.

Numerical Modeling and Optimizing Construction Schemes for Transition Section Complex Structure of Large Scale Underground Railway Station and Tunnel

2012 ◽  
Vol 256-259 ◽  
pp. 1177-1180
Author(s):  
Rui Lang Cao ◽  
Shao Hui He ◽  
De Lian Gao
Keyword(s):  
Cross Section ◽  
Large Scale ◽  
Variable Cross Section ◽  
Variable Cross ◽  
Construction Process ◽  
Large Span ◽  
Transition Section ◽  
Cell Method ◽  
Tunnel Transition ◽  
Underground Station

Based on the engineering background of New Beijing-Zhangjiakou Inter-city railway Badaling underground station and tunnel transition section construction, the problem of tri-arch and large-span variable single arch construction schemes in the transition section launched research. This paper draws some basis and the law as reference in construction process by the simulate calculation of ABAQUS finite element analysis software. This thesis discuss the frequently-used methods(middle cell method, one-side wall drift heading method, CRD-4 holes method and CRD-6 holes method) that is used in large-scale variable cross-section tunnel engineering research and analysis the stress, deformation and plastic areas distribution of surrounding rock by the simulate calculation of construction process. By comparative analysis, confirm the best construction scheme of transition section: the middle cell method applies to tri-arch cross-section and the CRD-4 holes method applies to large-span single arch of variable cross-section. It can offer direct guidance to the Badaling underground station and tunnel transition section project and some reference to similar underground projects.

The Program Design of the Variable Cross-Section of Concrete Continuous Skew Beam Bridge

2008 ◽  
Vol 400-402 ◽  
pp. 633-638
Author(s):  
Min Chen ◽  
Zhong Chu Tian ◽  
Guo Liang Zeng
Keyword(s):  
Cross Section ◽  
Concrete Beams ◽  
Variable Cross Section ◽  
Variable Cross ◽  
Girder Bridges ◽  
Practical Engineering ◽  
Uniform Cross Section ◽  
Girder Bridge ◽  
Beam Bridge ◽  
Compound Section

In practical engineering, we often encounter designs of variable cross-section or compound section skew girder bridge. While in many bibliographies, uniform cross-section of the concrete beams studying was carried out, but few of variable cross-section concrete beams were in-depth studied. Based on analyzing the mechanical behavior of variable cross-section beam skew girder bridge, the semi-analytic solution of variable cross-section beam skew girder bridges were provided in this paper. With this method developed a planar computation program to resolve the calculation problems of skew girder bridge, a more convenient way will be brought up for designers in calculation.

The Changes of Internal Forces and the Reliability of Curved Bridge Taking the Cross-Sectional Design of Axial Symmetrical

2014 ◽  
Vol 587-589 ◽  
pp. 1631-1636
Author(s):  
Zheng Jiu Zhao ◽  
Jing Hong Gao
Keyword(s):  
Cross Section ◽  
Variable Cross Section ◽  
Radius Of Curvature ◽  
Variable Cross ◽  
Cross Sectional ◽  
Box Girder ◽  
Curved Bridge ◽  
The Cross ◽  
Cross Sectional Design ◽  
Bridge Models

Taking a bridge of 160m long variable cross-section prestressed continuous curved box-girder as the research object and analyzing the cross-sectional design of axis with axial symmetrical or axial non-symmetrical to research the structure forces change of the upper part of bridge in different curvature. In order to test and verify the variable cross-section of prestressed continuous curved box-girder bridge is safe and reliable via cross-sectional design with axial symmetrical instead of axial non-symtrical within a radius of curvature of the interval. Creating the straight bridge and curved bridge models with different radius of curvature in same span by Midas/Civil to compare their structure forces.

Study on Rational Position of Joint Section of Steel-Concrete Hybrid Girder Bridge

2013 ◽  
Vol 671-674 ◽  
pp. 1007-1011
Author(s):  
Feng Jiang Qin ◽  
Jin Di ◽  
Jie Dai ◽  
Wen Ru Lu ◽  
Min Zhao
Keyword(s):  
Bending Moment ◽  
Variable Cross Section ◽  
Live Load ◽  
Variable Cross ◽  
Box Girder ◽  
Load Combination ◽  
Negative Bending ◽  
Girder Bridge ◽  
Joint Section ◽  
Beam Bridge

Taking Wei River Bridge with span combination of 69m+7×90m for example, the method of determining the steel-concrete joint section for variable cross-section steel-concrete hybrid continuous box girder bridge were investigated by finite element and parameter sensitivity analysis. The results show that it was an effective method for hybrid girder highway beam bridge from the view of mechanical property that the bending moment under dead load combination was employed as the main parameters, considering the negative bending moment in the pier top and the amplitude of bending moment in the joint section under live load. But based on reasonable structure stress conditions, the length of steel box girder that the host material of the bridge was concrete could determined by economy principle.

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