scholarly journals Research on three dimensional detection system of fatigue cracks of steel box girder

2018 ◽  
Vol 175 ◽  
pp. 03007
Author(s):  
Su Lin ◽  
Zhang Jian ◽  
Cheng Xi
Keyword(s):  
Detection System ◽  
Fatigue Cracks ◽  
Three Dimensional ◽  
Fatigue Tests ◽  
Steel Bridge ◽  
Test Results ◽  
Box Girder ◽  
Detection Scheme ◽  
Steel Box Girder ◽  
Homogeneous Test

The fatigue cracks are inevitably existed in steel bridges after they are working for a fairly short time because of the environmental pollution, overloading vehicles and larger numbers of automobiles. How to efficiently detect the fatigue cracks, especially the initial fatigue cracks, become one of the most important question to be solved for the steel box girder. The static and fatigue tests of the orthotropic steel bridge deck models were carried out in this research paper, which presented the fatigue damage developing laws, compared the test results with homogeneous test results in existing documents. Three dimensional micro detection scheme of fatigue cracks in steel box girder with three dimensional detection system is studied. Through the data from the testing design, the important characteristic width and length of the fatigue crack can be achieved, which can be used for the grasping of the mechanism of the steel box girder.

Three Dimensional Micro Detection Scheme of Fatigue Cracks in Steel Box Girder with HIROX Testing System

2014 ◽  
Vol 1049-1050 ◽  
pp. 281-284
Author(s):  
Jian Zhang ◽  
Tao Hong ◽  
Yan Yuan Gao ◽  
Jian Shu Ye ◽  
Jun Ai
Keyword(s):  
Fatigue Crack ◽  
Fatigue Cracks ◽  
Three Dimensional ◽  
Steel Bridges ◽  
Detection Technique ◽  
Testing System ◽  
Box Girder ◽  
Detection Scheme ◽  
Steel Box Girder ◽  
Testing Design

In practical steel box girder, the fatigue cracks are inevitably existed in steel bridges after they are burdened with the overloading vehicles and larger numbers of automobiles. How to efficiently detect the fatigue cracks, especially the initial fatigue cracks, become one of the most important question to be solved for the steel box girder. HIROX testing system is based on three dimensional micro detection technique, which was successfully used into the domains of aeronautics and astronautics. Three dimensional micro detection scheme of fatigue cracks in steel box girder with HIROX testing system is studied in this paper. Through the data from the testing design, the important characteristic width and length of the fatigue crack can be achieved, which can be used for the grasping of the mechanism of the steel box girder.

Analysis of Fatigue Mechanical Behaviors of Welding Conformations in Orthotropic Steel Bridge Deck

2015 ◽  
Vol 1096 ◽  
pp. 562-566 ◽  
Author(s):  
Bo Yu ◽  
Tao Hong ◽  
Jian Zhang ◽  
Qing Yu Liang
Keyword(s):  
Fatigue Damage ◽  
Bridge Deck ◽  
Fatigue Tests ◽  
Steel Bridge ◽  
Test Results ◽  
Practical Application ◽  
Mechanical Behaviors ◽  
Homogeneous Test ◽  
Orthotropic Steel Bridge Deck ◽  
Damage Theory

Due to the superior structure style, orthotropic steel bridge deck has been getting more and more widely practical application. The static and fatigue tests of the orthotropic steel bridge deck models were carried out in this research paper, which presented the fatigue damage developing laws, compared the test results with homogeneous test results in existing documents, and according to the relative fatigue accumulative damage theory, the fatigue accumulative damage equations of the sectional specimen and the whole specimen are respectively studied.

Experiment Design of Corrosive and Fatigue Property of Steel Box Girder Combined with Environment Controlling Equipment

2014 ◽  
Vol 1049-1050 ◽  
pp. 268-271
Author(s):  
Jian Zhang ◽  
Tao Hong ◽  
Jun Ai ◽  
Yan Yuan Gao ◽  
Qing Yu Liang
Keyword(s):  
Environmental Pollution ◽  
Residual Strain ◽  
Fatigue Cracks ◽  
Fatigue Property ◽  
Experiment Design ◽  
Steel Bridge ◽  
Corrosive Environment ◽  
Box Girder ◽  
Steel Box Girder ◽  
Short Time

The fatigue cracks are inevitably existed in steel bridges after they are working for a fairly short time because of the environmental pollution, overloading vehicles and larger numbers of automobiles. Due to the fact that the scholars have put few emphases on the influence of corrosive environment which inevitably affects the fatigue property of steel bridge, an experiment design of corrosive and fatigue property of steel box girder with the specific environment controlling equipment is taken into account. Through the data from the experiment design, the important residual strain can be gained, which can be used for the analysis of the damage developing regularity.

scholarly journals Improving Applicability for Information Model of an IFC-Based Steel Bridge in the Design Phase Using Functional Meanings of Bridge Components

2018 ◽  
Vol 8 (12) ◽  
pp. 2531 ◽  
Author(s):  
Sang Park ◽  
Junwon Park ◽  
Bong-Geun Kim ◽  
Sang-Ho Lee
Keyword(s):  
Information Model ◽  
Information Modeling ◽  
Design Stage ◽  
External Information ◽  
Steel Bridge ◽  
Unique Identifier ◽  
Box Girder ◽  
Data Schema ◽  
Steel Box Girder ◽  
Steel Box Girder Bridge

The industry foundation classes (IFC) data model is the most important data schema in ensuring the interoperability of the information generated throughout the lifecycle of facilities. However, because the current IFC model is focused on buildings, there are limitations when this model is applied to bridge structures. This paper proposes a method that enables the information modeling of steel box girder bridges based on the current IFC. To select the required and core items, we classify the components of a steel box girder bridge by the design stage with reference to engineering documents. To generate functional meanings of each bridge component, we develop the rules of the unique identifier and information reassignment, and then apply a semi-automated naming algorithm. The generated bridge information model was used to confirm the functional semantic meanings of individual components, and it was checked whether additional external information, such as carbon emissions, could be linked for specific bridge components. It was observed that information retrieval and extraction for components is possible through a semantic-based query to the generated IFC-based bridge information model.

Analysis on Crack Types and Causes of Junshan Bridge’s Steel Box Girder Orthotropic Plate

2013 ◽  
Vol 668 ◽  
pp. 621-624
Author(s):  
Jian Hua Cheng ◽  
Jian Min Xiong ◽  
Jie Dai
Keyword(s):  
Orthotropic Plate ◽  
Fatigue Cracks ◽  
Fatigue Cracking ◽  
Scientific Basis ◽  
Steel Bridge ◽  
Future Health ◽  
Box Girder ◽  
Detail Design ◽  
Design And Manufacturing ◽  
Long Operation

The fatigue cracking of orthotropic plate is a fatal problem for the long operation of steel bridge safely. There are numerous fatigue cracks appearing on Junshan Bridge, which locate mainly on diaphragm, U-Rib and fillet weld between the U-Rib and deck. Based on the location of fatigue cracks, the paper analyzed the causes of fatigue cracking from three aspects of mechanics cause, detail design and manufacturing factors, providing scientific basis of future health monitoring for bridges.

Research on Surface Cracks Identification of Continuous Steel Box Girder Bridge by Wavelet Analysis of the Strain Mode

2012 ◽  
Vol 178-181 ◽  
pp. 2509-2512
Author(s):  
De Qing Guan ◽  
Hong Wei Ying ◽  
Xiao Lin Zhong
Keyword(s):  
Three Dimensional ◽  
Haar Wavelet ◽  
Continuous Steel ◽  
Surface Cracks ◽  
Box Girder ◽  
Strain Mode ◽  
Steel Box Girder ◽  
Box Girder Bridge ◽  
Girder Bridge ◽  
Steel Box Girder Bridge

The paper chose a three-span continuous steel box girder bridge with horizontal semicircular surface cracks as research object, and the cracks are non-through and unsymmetrical. Solving strain modal parameters of beams with cracks by means of the three-dimensional finite element theory, and applying continuous wavelet transform (CWT) to analyze the strain mode by Haar wavelet, then the position of the cracks could be identified by the maximum of wavelet coefficients. The validity of the method has been proved by numerical calculation and analysis. Some useful conclusions for continuous steel girders bridge have been drawn and it has been useful in surface flaw identification and diagnosis in structures.

Finite Element Analysis on Mechanical Behavior of Orthotropic Steel Bridge Deck in Balinghe Bridge

2013 ◽  
Vol 639-640 ◽  
pp. 239-242
Author(s):  
Jian Hua Cheng ◽  
Jian Min Xiong ◽  
Jin Zhi Zhou
Keyword(s):  
Mechanical Behavior ◽  
Bridge Deck ◽  
Fatigue Cracks ◽  
Steel Bridge ◽  
Bridge Structure ◽  
Future Health ◽  
Wheel Load ◽  
Element Analysis ◽  
Box Girder ◽  
Orthotropic Steel Bridge Deck

Orthotropic plate participates in bridge structure as a part of steel box girder, while in Balinghe Bridge it is used as bridge deck directly to endure the wheel load [1]. In this paper it’s studied systematically the mechanical behavior of orthotropic steel bridge deck in combination with the deck model of Balinghe Bridge, and shows the positions emerging fatigue cracks to provide the basis for future health monitoring and put forward some suggestions.

Influences of Cyclic Pre-Overload on Low Cycle Fatigue Behaviours of Elbow Pipe

2011 ◽  
Author(s):  
Kazuya Matsuo ◽  
Koji Takahashi ◽  
Kyohei Sato
Keyword(s):  
Low Cycle Fatigue ◽  
Three Dimensional ◽  
Preliminary Test ◽  
Growth Direction ◽  
Fatigue Tests ◽  
Test Results ◽  
Cycle Fatigue ◽  
Crack Penetration ◽  
Crack Growth Direction ◽  
Cumulative Fatigue Damage

Low cycle fatigue tests were conducted using sound elbows made of carbon steel (STPT410). The elbows were subjected to cyclic in-plane bending under displacement control with internal pressure of 9 MPa. The preliminary fatigue tests were conducted under constant cyclic displacements. Then, two test conditions were adopted to investigate the influence of cyclic pre-overload on low cycle behavior of elbow on the basis of the preliminary test results. The fatigue test results were evaluated by using the total usage factor UFTotal (= UFpre+UFpost), where the UFpre and UFpost correspond to usage factor for δpre and δpost, respectively. The fatigue lives of overloaded elbow pipes were estimated based on the cumulative fatigue damage rule basically from UFpre = 0.2 to UFpre = 0.6. In addition, three-dimensional elastic-plastic analyses were carried out using the finite element method. The crack penetration area and the crack growth direction were successfully predicted by the analyses.

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