Crack Research for Welded Joint of Steel Truss Bridge

2011 ◽  
Vol 194-196 ◽  
pp. 104-108
Author(s):  
Zhong Shan He ◽  
Jia Liu
Keyword(s):  
Stress Intensity ◽  
Fatigue Cracks ◽  
Three Dimensional ◽  
Modeling Method ◽  
Finite Element Software ◽  
Steel Truss Bridge ◽  
Bridge Structures ◽  
Truss Bridge ◽  
Steel Trusses

Steel trusses are often used in the railway bridges.It is known that fatigue cracks may occour in the welded joints under the long-term dynamic loading. If the cracks are not detected and repaired in time, which may endanger the safety of bridges. This paper presents a solid element modeling method by the commercial finite element software package ANSYS, which can be used to model three dimensional cracked joint of bridge structures. Based on this method, the stress intensity factors are calculated. The results show that the modeling method is efficient and has a high precision for the stress intensity factor, which can be used to predict the fatigue life of the bridge.

3D Fine Modeling Method in Large and Complex Steel Truss Bridge

2014 ◽  
Vol 501-504 ◽  
pp. 1408-1412
Author(s):  
Yi Fan Jia ◽  
Yun Dong Peng ◽  
Hua Jiang
Keyword(s):  
Large Scale ◽  
Visual Analysis ◽  
Three Dimensional ◽  
Modeling Method ◽  
Decision Makers ◽  
Data Conversion ◽  
Steel Truss Bridge ◽  
Steel Truss ◽  
Truss Bridge ◽  
Analysis Platform

The design and construction of the stiffening steel truss bridge is a complex and large-scale professional program. The abstract of the plans and the weaknesses of the view angles to the design sketch will also become limitations to the owners and the decision makers. Based on the project of Baling River Bridge of large stiffening steel truss girders, this study creates a three-dimensional fine model for it via CAD, pre-assembles each parts of the bridge, and checks sections and dockings one to one correspondingly. Data conversion of this model directly generates virtual visualized model. This visualized fine model of Baling River Bridge provides decision makers with a visual analysis platform, which also offers technical guarantee and support for sensible decision makings.

The Research of Thermosetting Resin Matrix Composite Reinforcing Application in the Web of Truss Bridge

2012 ◽  
Vol 531 ◽  
pp. 638-641
Author(s):  
Li Wei ◽  
Guang Qing Zhou ◽  
Jia Guo Zheng ◽  
Kun Liang Liu
Keyword(s):  
Three Dimensional ◽  
Steel Structure ◽  
Resin Matrix ◽  
Three Dimensional Model ◽  
Finite Element Software ◽  
Concrete Members ◽  
Long Span ◽  
Long Span Bridge ◽  
Resin Matrix Composite ◽  
Truss Bridge

A significant number of concrete members were strengthened by carbon fiber reinforced polymer (CFRP).However there are only a few applications in strengthening steel structure with CFRP. The three-dimensional model of the long span bridge is made by using the finite element software ANSYS and do the force analysis of it ,then make composites reinforcement in order to Improve the structure strength and increase bridge life. The conclusion received of this paper is that composite patch at the end of web is more effective than in the middle of web. By picking up the stress distribution of every layer, the law of stress is obtained.

Estimation of Stress Intensity Factors for Embedded Irregular Cracks Subjected to Arbitrary Normal Stress Fields

1980 ◽  
Vol 102 (2) ◽  
pp. 202-211 ◽  
Author(s):  
M. Oore ◽  
D. J. Burns
Keyword(s):  
Stress Intensity ◽  
Normal Stress ◽  
Fatigue Cracks ◽  
Three Dimensional ◽  
Stress Fields ◽  
Intensity Factors ◽  
Opening Mode ◽  
Mode Stress ◽  
Planar Crack ◽  
Integral Procedure

An integral is developed for calculating opening mode stress intensity factor at any point on the front of an irregular planar crack embedded in an infinite solid and subjected to an arbitrary normal stress field. No other solutions are available for irregular cracks, therefore the integral is first used to analyze three-dimensional regular cracks for which there are solutions. An embedded square crack is used to illustrate the integral procedure for an irregular shape. The integral is also used to explain qualitatively how irregular fatigue cracks will grow.

scholarly journals Three- Dimensional Simulation of Crack Propagation using Finite Element Method

2019 ◽  
Vol 9 (2) ◽  
pp. 892-897 ◽  
Keyword(s):  
Finite Element ◽  
Stress Intensity ◽  
Crack Growth ◽  
Stress Intensity Factors ◽  
Crack Path ◽  
Three Dimensional ◽  
Life Time ◽  
Intensity Factors ◽  
Growth Step ◽  
Finite Element Software

The 3D finite element software ANSYS Workbench software has been employed for simulation of engineering geometries which are containing a pre-cracks and holes. The new feature in this software is using the smart crack growth procedure and the mesh smoothing technique which provides an adaptive and smooth mesh around the crack path as well as the higher stresses area. Under the assumption of LEFM, the stress intensity factors was used as a crack growth criterion which provided as indicators of failure compared to the fracture toughness or threshold stress intensity factors (SIFs) in both static and dynamic loading respectively. The stress intensity factors were calculated for every crack growth step and the fatigue life time was predicted according to the number of cycles. The effect of the nominal notch position of the crack was illustrated. Simulations performed with Ansys show an identical crack path on structures that is in line with that of the experimental and numerical results performed by other researchers.

A Study on the 3D Fine Model of a Large-Scale and Complicated Steel Truss Bridge

2011 ◽  
Vol 99-100 ◽  
pp. 383-387 ◽  
Author(s):  
Qun Wei ◽  
Hua Jiang ◽  
Sheng Ji Li
Keyword(s):  
Large Scale ◽  
Visual Analysis ◽  
Three Dimensional ◽  
Decision Makers ◽  
Data Conversion ◽  
Truss Bridges ◽  
Steel Truss Bridge ◽  
Steel Truss ◽  
Truss Bridge ◽  
Analysis Platform

The design and construction of the stiffening steel truss bridges is a complex and large-scale professional program. The abstract of the plans and the weaknesses of the view angles to the design sketch will also become limitations to the owners and the decision makers. Based on the project of River Baling Bridge of large stiffening steel truss girders, this study creates a three-dimensional fine model for it via CAD, pre-assembles each parts of the bridge, and checks sections and dockings one to one correspondingly. Data conversion of this model directly generates virtual visualized model. This visualized fine model of River Baling Bridge provides decision makers with a visual analysis platform, which also offers technical guarantee and support for sensible decision makings.

scholarly journals Three-dimensional fatigue crack propagation analysis of welded steel beam based on global-local numerical model

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Liang Zong ◽  
Gang Shi
Keyword(s):  
Fatigue Crack ◽  
Numerical Model ◽  
Crack Propagation ◽  
Three Dimensional ◽  
Local Model ◽  
Fatigue Assessment ◽  
Steel Truss Bridge ◽  
Propagation Analysis ◽  
Steel Truss ◽  
Truss Bridge

AbstractThe existing fatigue assessment approaches were mainly conducted on the component level. The interaction of local component damage and the global response cannot be well addressed. In this study, three-dimensional (3D) fatigue crack propagation analysis approach based on global-local numerical model was implemented, and examined to be accurate and effective through a series of systematic experimental data obtained by Fisher. Afterwards, the approach was introduced into a typical steel truss bridge for realizing more refined fatigue assessment from the global structural level. The fatigue performance of the longitudinal steel welded beam in the steel truss bridge was investigated based on global-local model and local model respectively. It was found that there is no difference in terms of the fatigue crack growth mechanism between the simulation between global-local model and local model due to that the stress level of the whole structure is relatively low. At last, the effect of heavy haul train operation on the fatigue performance of the steel truss bridge was analyzed. It was observed that the residual life of the longitudinal steel welded beam would have an obvious reduction when the axle load was increasing. The research work in this study presents a technical solution for the fatigue assessment of the global structure and can provide beneficial reference for relevant practical engineering projects.

Investigation of Temperature Effects on Steel-Truss Bridge Based on Long-Term Monitoring Data: Case Study

2020 ◽  
Vol 25 (9) ◽  
pp. 05020007
Author(s):  
Qing-Xin Zhu ◽  
Hao Wang ◽  
Jian-Xiao Mao ◽  
Hua-Ping Wan ◽  
Wen-Zhi Zheng ◽  
...  
Keyword(s):  
Temperature Effects ◽  
Monitoring Data ◽  
Steel Truss Bridge ◽  
Steel Truss ◽  
Long Term Monitoring ◽  
Truss Bridge ◽  
Term Monitoring
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