Longitudinal stress over supports of concrete box-girder bridges

1981 ◽  
Vol 8 (2) ◽  
pp. 155-164 ◽  
Author(s):  
A. Ghali ◽  
M. S. Cheung ◽  
W. H. Dilger ◽  
M. Y. T. Chan
Keyword(s):  
Finite Element ◽  
Beam Theory ◽  
Type Equation ◽  
Box Girder Bridges ◽  
Element Analysis ◽  
Box Girder ◽  
Girder Bridges ◽  
Beam Type ◽  
Concrete Box Girder Bridges ◽  
Classical Beam Theory

This paper describes a study of the values of longitudinal moments/stresses and their distribution at sections over the supports of continuous box-girder bridges. A series of continuous box-girder bridges are analyzed using the finite element method. Results from the finite element analysis are compared with the classical beam theory which is commonly used in the design office for this type of bridge. It is found that the use of the classical beam theory assuming knife-edge supports usually results in an overestimation of the support moments. A modified beam-type equation for the support moments is proposed here for the design of continuous box-girder bridges.

Study on Crack Causes and Strengthening Measures of Large Span PC Continuous Box Girder Bridges

2010 ◽  
Vol 163-167 ◽  
pp. 3551-3554
Author(s):  
Wei Peng ◽  
Zhi Xiang Zha
Keyword(s):  
Prestressed Concrete ◽  
Load Test ◽  
Box Girder Bridges ◽  
Element Analysis ◽  
Box Girder ◽  
Girder Bridges ◽  
Long Span ◽  
Concrete Box Girder Bridges ◽  
Girder Bridge ◽  
Engineering Projects

This template Based on cracks observation and finite element analysis of real engineering projects as well as bridge load test after reinforcement, causes and types of cracks in prestressed concrete box girder bridges and treating measurements are systematically studied. The results obtained from the calculation are presented to demonstrate the effect of sensitive factors, such as arrangement of longitudinal prestressed tendons, the magnitude of vertical prestressed force, temperature gradient, etc. The results show that the arrangement of longitudinal prestressed tendons and the magnitude of vertical prestressed force take key roles in cracks control of box girder webs. Lots of treating measurements are presented in accordance with different types of cracks, some of them are applied to a reinforcement engineering of a long span pretressed concrete continuous box girder bridge with cracks. Load test after reinforcement of the bridge demonstrates the reasonability of the treating measurements. Several design recommendations and construction measures about reinforcements and some sensitive factors mentioned above are proposed to control cracks.

A materially nonlinear finite element model for the analysis of curved reinforced concrete box-girder bridges

1993 ◽  
Vol 20 (5) ◽  
pp. 754-759 ◽  
Author(s):  
S. F. Ng ◽  
M. S. Cheung ◽  
J. Q. Zhao
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Finite Element Model ◽  
Element Model ◽  
Nonlinear Material ◽  
Box Girder Bridges ◽  
Box Girder ◽  
Girder Bridges ◽  
Concrete Box Girder ◽  
Concrete Box Girder Bridges

A layered finite element model with material nonlinearity is developed to trace the nonlinear response of horizontally curved reinforced concrete box-girder bridges. Concrete is treated as an orthotropic nonlinear material and reinforcement is modeled as an elastoplastic strain-hardening material. Due to the fact that the flanges and webs of the structure are much different both in configuration and in the state of stresses, two types of facet shell elements, namely, the triangular generalized conforming element and the rectangular nonconforming element, are adopted to model them separately. A numerical example of a multi-cell box-girder bridge is given and the results are compared favourably with the experimental results previously obtained. Key words: finite element method, curved box-girder bridges, reinforced concrete, nonlinear analysis.

scholarly journals Spatial Finite Element Analysis for Dynamic Response of Curved Thin-Walled Box Girder Bridges

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Yinhui Wang ◽  
Yidong Xu ◽  
Zheng Luo ◽  
Haijun Wu ◽  
Liangliang Yan
Keyword(s):  
Finite Element ◽  
Dynamic Response ◽  
Degrees Of Freedom ◽  
Response Analysis ◽  
Box Girder Bridges ◽  
Element Analysis ◽  
Box Girder ◽  
Girder Bridges ◽  
System A ◽  
Thin Walled

According to the flexural and torsional characteristics of curved thin-walled box girder with the effect of initial curvature, 7 basic displacements of curved box girder are determined. And then the strain-displacement calculation correlations were established. Under the curvilinear coordinate system, a three-noded curved girder finite element which has 7 degrees of freedom per node for the vibration characteristic and dynamic response analysis of curved box girder is constructed. The shape functions are used as the interpolation functions of variable curvature and variable height to accommodate to the variation of curvature and section height. A MATLAB numerical analysis program has been implemented.

DYNAMIC ANALYSIS OF PRESTRESSED CONCRETE BOX-GIRDER BRIDGES BY USING THE BEAM SEGMENT FINITE ELEMENT METHOD

2011 ◽  
Vol 11 (02) ◽  
pp. 379-399 ◽  
Author(s):  
Z.-C. WANG ◽  
W.-X. REN
Keyword(s):  
Finite Element ◽  
Dynamic Analysis ◽  
Prestressed Concrete ◽  
Element Formulation ◽  
Box Girder Bridges ◽  
Box Girder ◽  
Girder Bridges ◽  
Beam Segment ◽  
Concrete Box Girder ◽  
Concrete Box Girder Bridges

A beam segment element formulation is presented for the dynamic analysis of prestressed concrete box-girder bridges, which can conveniently takes into account the effects of the restrained torsion, distortion, transverse local deformation, diaphragms, and prestressing tendons of prestressed concrete box-girder bridges. The spatial displacement field of the beam segment element is directly represented by the nodal degrees of freedom of the corner points. The stiffness matrix and mass matrix of such a segment element are formulated based on the principle of stationary total potential energy in elastic system dynamics. The proposed beam segment element formulation is then implemented to carry out the free vibration analysis of a real case prestressed concrete box-girder bridge. In terms of both natural frequencies and mode shapes, the formulation is verified by the three-dimensional (3D) finite element analysis using a commercial package. It is demonstrated that the proposed beam segment element formulation is suitable and efficient for the dynamic analysis of prestressed concrete box-girder bridges with the advantages of less element numbers and enough accuracy. It is expected that this methodology can be an effective approach for the further dynamic response analysis under all kinds of dynamic loads such as earthquakes, winds, vehicles, and their interaction.

Finite Element Analysis of Continuous Curved Box-Girder Bridge

2013 ◽  
Vol 454 ◽  
pp. 183-186
Author(s):  
Qi Yong You
Keyword(s):  
Finite Element ◽  
Internal Force ◽  
Calculation Model ◽  
Box Girder Bridges ◽  
Element Analysis ◽  
Box Girder ◽  
Girder Bridges ◽  
Internal Forces ◽  
Box Girder Bridge ◽  
Girder Bridge

The calculations of plan truss and beam-girder method on straight bridge were analyzed, which determined right beam-girder method calculation model of the box-girder bridge. Based on this model, the different radius continuous curved box-girder bridges were simulated by finite element, and then the internal forces of the bridge were obtained. The calculations of inner beam and outer beam show the change rule of internal force and bridge radius. The reasonable calculation methods of continuous curved box girder bridges are obtained, which can offer help to the bridge designers.

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