Effectiveness Evaluation on Prestressed Continuous Box Girder Bridge Strengthening with Prestressing

2014 ◽  
Vol 501-504 ◽  
pp. 1343-1347
Author(s):  
Xin Zhao ◽  
Wan Jie Xu
Keyword(s):  
Carrying Capacity ◽  
Limit State ◽  
Element Model ◽  
Effectiveness Evaluation ◽  
Loading Test ◽  
Box Girder ◽  
Capacity Limit ◽  
Bridge Strengthening ◽  
Box Girder Bridge ◽  
Girder Bridge

This paper presented the deterioration condition and strengthening measures of a prestressed continuous box girder bridge. Finite element model of the bridge was built and condition was assessed according to current codes. Strain and deflection were measured through loading test to assess the stiffness in-service and the carrying capacity of the strengthened bridge. The results indicate that the carrying capacity limit state and serviceability limit state of the bridge are improved.

Research on Extending Span of Box Girder Bridge with Corrugated Steel Webs up to 300m

2019 ◽  
Author(s):  
Dong Xu ◽  
Xiangyong Duanmu ◽  
Yafan Zhou
Keyword(s):  
Limit State ◽  
Ultimate Limit State ◽  
Beam Model ◽  
Box Girder ◽  
Single Beam ◽  
Stability Performance ◽  
Rigid Frame ◽  
Box Girder Bridge ◽  
Girder Bridge ◽  
Under Construction

<p>In order to promote the application of steel-concrete composite structure in mountainous areas in China, a conceptual design for a PC continuous rigid frame box-girder bridge with corrugated steel webs and main span of 300 m was performed in the present paper. The combined corrugated steel web was proposed to increase the compressive area and improve the stability performance; thus, the self-weight of the composite box-girder bridge is significantly reduced. Flexural capacity of the whole section had been calculated with a single-beam model for the ultimate limit state (ULS). For the service limit state (SLS) design, the calculation for the composite box-girder bridge was conducted with the spatial grid model (SGM), from which 27 complete checking stresses in three layers (i.e. outside, inside and middle planes) of concrete plates and steel webs in every cross-section could be obtained. The stress history under construction stage was incorporated into the results obtained by SGM. Moreover, the stress states and stability performance for the composite box-girder bridge constructed were evaluated. The present investigation can provide references for the design and construction of the composite box-girder bridge with corrugated steel webs for long spans.</p>

Calculation of Cross Beam in Continuous Box Girder Bridge Based on Modified Shear Method

2014 ◽  
Vol 578-579 ◽  
pp. 642-647
Author(s):  
Ya Feng Gong ◽  
Xiao Bo Sun ◽  
Huan Li Wang ◽  
Hai Peng Bi
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Traditional Method ◽  
Element Model ◽  
Measured Data ◽  
Box Girder ◽  
Box Girder Bridge ◽  
Girder Bridge ◽  
Simplified Calculation ◽  
The Finite Element Model

The mechanical properties of cross beam in continuous box girder bridge can be obtained through analyzing the finite element model and measured data of bridge. A new simplified calculation method for cross beam is proposed in this paper, which is called modified shear method. Comparative analysis with traditional method is used to verify its feasibility and practicability.

scholarly journals Analysis of Static Characteristics of Steel Box Girder Bridge being composited High Strength Concrete at the Lower Flange of the Support

2021 ◽  
Vol 21 (1) ◽  
pp. 219-224
Author(s):  
Taegweon Cha ◽  
Ilyoung Jang
Keyword(s):  
High Strength Concrete ◽  
Torsional Rigidity ◽  
High Strength ◽  
Loading Test ◽  
Box Girder ◽  
Strength Concrete ◽  
Steel Box Girder ◽  
Box Girder Bridge ◽  
Girder Bridge ◽  
Steel Box Girder Bridge

The steel box girder bridge has excellent applicability to curved bridges owing to its large torsional rigidity. In addition, because the weight of the segments is smaller than that of concrete bridges, it also has many applications for medium-range bridges. However, when a bridge with a span greater than 70 m is constructed, the height of the steel box girder increases, which is disadvantageous for the manufacture and transportation of girders and for bridge construction. Therefore, improvements in the construction methods are required to facilitate construction. Therefore, a structural system of a double composite box girder bridge with an upper slab and composite high-strength concrete at the lower flange of the support of continuous span was proposed, and the structural performance was verified by finite element analysis and a static loading test of an actual specimen. It was confirmed that such a structure minimizes the height of the girder of continuous support by optimizing the sectional efficiency and also improves usability.

Accurate FEM of Steel-Concrete Composite Box Girder Bridge for Damage Identification Based on Dynamical Experimental Study

2013 ◽  
Vol 330 ◽  
pp. 872-877
Author(s):  
Yi Qiang Xiang ◽  
Li Si Liu ◽  
Shao Jun Li
Keyword(s):  
Experimental Study ◽  
Finite Element ◽  
Finite Element Model ◽  
Damage Identification ◽  
Element Model ◽  
Scale Model ◽  
Box Girder ◽  
Box Girder Bridge ◽  
Girder Bridge ◽  
The Finite Element Model

Based on the results of experiment, this paper discusses about the updating and validation of accurate finite element model for damage identification of the steel-concrete composite box girder bridge. Taking a 5 meters long steel-concrete composite box girder bridge as the research object and the finite element model is established. By means of scale model test the updating of the accurate finite element model has been completed and validation is confirmed.

Analysis of the Design Method for the Casual Anchor Skeleton at the Closure for PC Continuous Box Girder Bridge

2013 ◽  
Vol 712-715 ◽  
pp. 1011-1017
Author(s):  
Ting Li ◽  
Xing Wang Sheng ◽  
Hua Shuai Zhang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Design Method ◽  
Element Model ◽  
Analytic Method ◽  
Finite Model ◽  
Box Girder ◽  
Box Girder Bridge ◽  
Girder Bridge ◽  
Element Study

A finite element study was performed to investigate the design method of the casual anchor skeleton at the closure of a PC continuous box girder bridge. Based on a finite element model of a certain four spans PC continuous box girder bridge, we found that the stresses of skeleton calculated with the finite model were 5 percent beyond those with the traditional analytic method. Besides, the tensile stresses increased 19 percent and the compressive ones were 14 percent decreased considered the vertical unbalance temperature and both increased 8 percent for the wind, which were totally ignored in the traditional analytic method. So, the traditional analytic method is inaccurate and unsafe for the casual anchor skeleton design, and the general temperature difference, the vertical unbalance temperature and the wind are better to be considered.

Analysis of Loading Test Research on a Steel-Concrete Composite Box Girder Bridge

2013 ◽  
Vol 438-439 ◽  
pp. 908-912
Author(s):  
Zhi Yong Wang ◽  
Qiu Yan Sun ◽  
Du Bo Wang
Keyword(s):  
Loading Test ◽  
Box Girder ◽  
Calculation Results ◽  
Impact Coefficient ◽  
Design Requirements ◽  
Static And Dynamic Tests ◽  
Working Performance ◽  
Box Girder Bridge ◽  
Stress And Deformation ◽  
Girder Bridge

In order to understand the overall mechanical characteristics of a steel-concrete composite box girder bridge, static and dynamic tests were carried out. According to the results of tests and calculations, its bearing capacity and working performance were evaluated. The results show that the stress and deformation at control cross-section of the bridge meet design requirements under the static load, the vibration frequency and impact coefficient consistent with the theoretical calculation results under the dynamic load.

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