Lateral Calculation and Analysis of Shear Lag Effect of Extra-Wide Triple-Cell Single Box Girder

2014 ◽  
Vol 501-504 ◽  
pp. 1429-1433
Author(s):  
Ming Jin Zhang
Keyword(s):  
Finite Element ◽  
Local Stress ◽  
Element Model ◽  
The Self ◽  
Shear Lag ◽  
Box Girder ◽  
Lag Effect ◽  
Triple Cell ◽  
Main Girder ◽  
The Finite Element Model

The main bridge of Yunshi Hanjiang River Bridge is a prestressed concrete extradosed bridge with two pylons, a single cable plane and with span arrangement (128+238+128) m. The main girder of the bridge is the concrete continuous triple-cell single box girder of long cantilevers and variable sections, the box girder is 26.5m wide. The cantilever of girder is 5.75m wide as to reduce the self-weight of main girder. In the design, the software Dr.Bridge was used to establish the finite element model for the box girder and to carry out the global calculation of the girder lateral calculation. The software ANSYS was used as well to establish the finite element model for the segments of the main girder and to carry out the analysis of the local stress of the girder. The results of the calculation and analysis indicate that the global structure of the bridge is safe and reliable and the structure can meet the requirements for highway vehicle riding safety and comfort. No significant local stress concentration appears in the main girder, the stress amplitude values of the stay cables are within 30Mpa, and the structure can meet the requirements for durability in the process of service of the bridge. With long cantilever design greatly reduce the self-weight of main girder and saving cost, at the same time make the bridge look lighter and beautiful. The results of the analysis provide a reference for analysis on the shear lag effect and lateral calculation of the concrete continuous triple-cell single box girder of long cantilevers and variable sections.

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 Mechanical Performance Analysis and Parametric Study of a Self-Anchored Suspension Bridge with Ultra-Wide Double-Sided Steel Box Girder

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Fangwen Wu ◽  
Wenlong Tang ◽  
Shuo Liu ◽  
Yanpeng Feng ◽  
Guangqian Wang ◽  
...  
Keyword(s):  
Mechanical Performance ◽  
Suspension Bridge ◽  
Design Parameters ◽  
Shear Lag ◽  
Shear Lag Effect ◽  
Box Girder ◽  
Vehicle Load ◽  
Steel Box Girder ◽  
Lag Effect ◽  
Main Girder

A sufficient understanding of mechanical performance of self-anchored suspension bridge with double-sided steel box girder is essential for design and normal use as such bridges are widely built in urban bridge. Using the Yunlongwan Bridge which is a suspension bridge with ultra-wide double-sided steel box girder as an example, this paper investigates its deformation and mechanical performance under vehicle load. Firstly, based on the field test results, the deformation performance of the bridge and the stress distribution of the main girder are analysed, with emphasis on the shear lag effect of double-sided steel box girder. Then, a multiscale model of the bridge was built, and the accuracy of the model was verified by comparison with the test data. Finally, the influence of design parameters on the mechanical behaviour of double-sided steel box girder is studied by numerical simulation. The results show that the deformation of the bridge has good symmetry, there is obvious shear lag effect on the main girder, and the U-rib thickness, diaphragm spacing, and vehicle load could significantly affect the stress of the main girder top plate. The obtained analytical results lead to a better understanding of the mechanical performance and provide reference for the design of self-anchored suspension bridge with double-sided steel box girder.

scholarly journals STUDY ON SPATIAL STRESS EFFECT OF PC CONTINUOUS THIN-WALLED BOX GIRDER BRIDGE

2021 ◽  
Vol 30 (3) ◽  
Author(s):  
Honglei Zhang
Keyword(s):  
Finite Element ◽  
Load Test ◽  
Bottom Plate ◽  
Stress Effect ◽  
Shear Lag ◽  
Element Analysis ◽  
Box Girder ◽  
Lag Effect ◽  
Girder Bridge ◽  
Spatial Stress

In order to study the influence of spatial stress effect and shear lag effect on the cracking of PC continuous thin-walled box girder bridge, a spatial model was established by using ANSYS finite element software to analyze the internal stress distribution of the bridge. The test results are compared with the analysis results of spatial model and plane link system model through the load test of real bridge. The results show that the longitudinal stress is evenly distributed along the width direction, which means that the spatial stress effect and the shear lag effect have little influence on the downdeflection of the bridge. The shear lag coefficient at the longitudinal axis of midspan bottom plate and the intersection of bottom plate and web are larger than other positions, which is most likely to produce cracks caused by stress concentration, and should be strengthened here in practical engineering. The results of load test show that the results of spatial finite element analysis are more reliable than those of plane link system calculation, and the design and construction based on the results of spatial finite element analysis is safer.

The Local Stress Analysis for the Anchorage Zone of Tooth Plate in Steel Box Girder

2013 ◽  
Vol 477-478 ◽  
pp. 631-634
Author(s):  
Zuo Long Luo ◽  
Jiang Long Wang ◽  
Feng Hui Dong
Keyword(s):  
Finite Element ◽  
Comparative Analysis ◽  
Local Stress ◽  
Element Model ◽  
Maximum Difference ◽  
Box Girder ◽  
Steel Box Girder ◽  
Tooth Plate ◽  
The Difference ◽  
Different Parts

Calculating the local stress for the anchorage zone of each part in the tooth plate by establishing two kinds of finite element model: considering concrete effect and not considering concrete effect. The result of the comparative analysis of the two models shows that the local stress considering the concrete effect is smaller than that not considering the concrete effect and the maximum difference is about 170 MPa. The difference is not the same in different parts of the tooth plate. Although the design will be tend to be safe for not considering the concrete effect, the size of the tooth plate may increase. Therefore, in order to reduce the weight of the tooth plate , the concrete effect should be taken into consideration in the design.

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.

The Finite Element Analysis on Shear-Lag Effect of the Steel Box-Girder

2013 ◽  
Vol 671-674 ◽  
pp. 815-819
Author(s):  
Yi Sheng Li ◽  
Jun Ping Wang ◽  
Wei Liu ◽  
Jian Ming Shen
Keyword(s):  
Finite Element ◽  
Effective Width ◽  
Shear Lag ◽  
Shear Lag Effect ◽  
Element Analysis ◽  
Box Girder ◽  
Finite Element Software ◽  
Steel Box Girder ◽  
Lag Effect ◽  
The Finite Element Analysis

The shear-lag effect of steel box-girder is qualitatively analyzed by using the finite element software ANSYS. Various methods to reduce the shear-lag effect are studied, and the most effective method is changing the web layout and increasing the number of box-room among them. The suggested value of effective width to thickness ratio b1/t1 of the flange without considering the shear-lag effect are obtained in this paper.

A Method to Determine Local Stress Fields in Microstructure Features Produced by Additive Manufacturing

2017 ◽  
Author(s):  
Robert Saunders ◽  
Amit Bagchi ◽  
Ajit Achuthan
Keyword(s):  
Finite Element ◽  
Additive Manufacturing ◽  
Finite Element Model ◽  
Void Formation ◽  
Local Stress ◽  
Element Model ◽  
Stress Fields ◽  
Shape Preserving ◽  
Columnar Grains ◽  
The Finite Element Model

Metal power-based additive manufacturing (PAM) processes typically result in microstructures with a texture and columnar grains of different grain sizes, which affect the mechanical properties of the material. In this work, a method is developed to better represent the local granular stress fields within the microstructure. This is accomplished by converting a digital image segmentation from a synthetic microstructure into a shape-preserving finite element model with a microstructure-informed constitutive model that describes the mechanical behavior of solidified material produced by PAM. The new method to develop the finite element model allows the local stress intensification to be better captured in the vicinity of the grain boundary and helps with the prediction of defects and void formation in the material.

Influence of External Tendons on Dynamic Characteristics of Box Girder with Corrugated Steel Webs

2010 ◽  
Vol 163-167 ◽  
pp. 2131-2136 ◽  
Author(s):  
Jian Bo Chen ◽  
Bao Dong Liu ◽  
Peng Fei Li
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Natural Frequency ◽  
Dynamic Characteristics ◽  
Element Model ◽  
Box Girder ◽  
External Tendons ◽  
The Impact ◽  
The Finite Element Model

Based on Miyamoto’s method, the natural frequency of prestressed box girder with corrugated steel webs considering the impact of external tendons was obtained. And the result was modified based on the finite element model. It shows that: the external tendons will reduce the natural frequency of bridge with reduced range of about 3%. Beneficial references were provided to the layout of external tendons in order to avoid the resonance between the box girder with corrugated steel webs and the external tendons.

Analysis of Effect Factors about Shear Lag in Curved Box Girder under Seismic Loads

2014 ◽  
Vol 926-930 ◽  
pp. 505-510
Author(s):  
Hai Lin Lu ◽  
Li Peng Chen ◽  
Song Bo Zhu ◽  
Chong Yong Wan ◽  
Jia Qi Qian
Keyword(s):  
Finite Element ◽  
Curvature Radius ◽  
Seismic Load ◽  
Finite Element Models ◽  
Seismic Loads ◽  
Shear Lag ◽  
Effect Factors ◽  
Box Girders ◽  
Box Girder ◽  
Lag Effect

The shear lag effect will cause damage to the curved box girders. And it will adversely affect the bridge’s seismic performance. In order to analyze the effect under seismic loads, finite element models were created in this paper. By changing the parameters, such as curvature radius, width and height, their influence on the shear lag were studied. Results show that the effect was more obvious in wide and flat box girders under seismic load.

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