Analysis of fatigue behavior of welded joints in orthotropic bridge deck using traction structural stress

In this study, the fatigue behavior of welded joints in an orthotropic steel bridge is simulated and analyzed. The traction structural stress method is proven to be more accurate and effective, and the predicted results agree well with the test results compared to traditional assessment methods, including the nominal stress, hot-spot stress, and effective notch stress methods. The traction structural stress concentration factor curves of welded joints under cyclic tensile and bending moment loading are obtained. The accuracy and validity of finite-element simulation methods for welded joints in orthotropic steel bridge are verified by comparing simulation results with full-scale tests results. Equivalent nominal stresses predicted by the master S–N curve method based on traction structural stress results agree well with the fatigue test results with small standard deviation. The fatigue behavior of orthotropic steel bridge analysis specifications Eurocode3 and GB50017 is combined with the traction structural stress method using unified traction structural stress concentration factor curves. This approach provides practical guidance for the fatigue behavior design of orthotropic steel bridges.

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Theoretical Analysis and Experimental Verification of the Stress Concentration Factor at the Steel Tube-Welded Hollow Sphere Connection Node

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.851.739 ◽

2016 ◽

Vol 851 ◽

pp. 739-744

Author(s):

Bo Li ◽

Hong Gang Lei ◽

Xu Yang

Keyword(s):

Finite Element ◽

Stress Concentration ◽

Theoretical Analysis ◽

Hollow Sphere ◽

Stress Concentration Factor ◽

Concentration Factor ◽

Hot Spot ◽

Steel Tube ◽

Element Analysis ◽

Hot Spot Stress

In this paper, the author uses ANSYS, the software of finite element analysis, to establish the finite element model, the hot spot stress value of different connection structures of steel tube-welded hollow sphere under uniaxial elongation has been analyzed, the theoretical stress concentration factor of this joint has been obtained. Through the static test on the four typical test-piece, 26 steel tube-welded hollow spherical nodes in total, the actually measured stress concentration factor of the joints has been obtained. The theoretical analysis basically coincides with the law of stress concentration factor obtained from the test results.

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Research on Fatigue Properties of Typical Welded Joints of DH36 Steel at −60 °C

Applied Sciences ◽

10.3390/app10113742 ◽

2020 ◽

Vol 10 (11) ◽

pp. 3742

Author(s):

Weidong Zhao ◽

Guoqing Feng ◽

Wenchao Liu ◽

Huilong Ren

Keyword(s):

Stress Concentration ◽

Welded Joints ◽

Room Temperature ◽

Polar Region ◽

Hot Spot ◽

Fatigue Properties ◽

Test Results ◽

Hot Spot Stress ◽

Confidence Levels ◽

Better Than

As the development of the polar region continues to increase, the fatigue properties of structures at low temperature are increasingly receiving researcher attention. This study aimed to investigate the fatigue properties of T-welded and cruciform welded joints at −60 °C. Logarithmic S–N curves based on the hot-spot stress of the T-welded and cruciform welded joints at 50% and 95% confidence levels were obtained at −60 °C. The test results showed that the fatigue properties of T-welded joints were almost 2–7% better than those of the cruciform welded joints at −60 °C. Factors that affected the fatigue properties of welded joints, such as the stress concentration factor, microstructure, Vickers hardness profiles, and fractography, were also studied and the test results showed that the fatigue properties of cruciform welded joints at −60 °C were 57.215% better than at room temperature.

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Stress concentration factor and hot spot stress studies of partially overlapped circular hollow section K-joints

10.32657/10356/25677 ◽

2010 ◽

Author(s):

Sopha Thong

Keyword(s):

Stress Concentration ◽

Stress Concentration Factor ◽

Concentration Factor ◽

Hot Spot ◽

Hot Spot Stress ◽

Hollow Section ◽

Stress Studies ◽

Circular Hollow Section

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Study of Typical Welded Joint Hot Spot Stress Concentration Factor

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.160-162.1482 ◽

2010 ◽

Vol 160-162 ◽

pp. 1482-1487

Author(s):

Bin Jie Wang ◽

Qiang Li ◽

Zhi Ming Liu

Keyword(s):

Stress Concentration ◽

Stress Concentration Factor ◽

Concentration Factor ◽

High Speed ◽

Welded Joint ◽

Hot Spot ◽

Nominal Stress ◽

Hot Spot Stress ◽

The Difference ◽

Fatigue Evaluation

Hot spot stress (HSS) approach is more applicable for fatigue evaluation, because it is more closer to the real stress at the welded notch than nominal stress.This paper studies a typical welded joint, fillet welded joint, which is used widely in high-speed car. Hot spot stress concentration factor is calculated under different nominal stress and loading methods. The S-N curves belong to nominal stress and hot spot stress were analysized. The result show that the difference between the S-N curves under different load style can be reduced greatly by hot spot stress. The hot spot stress characteristic variable was put forward, which is used to describe the influence from the welding size of the joint.

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Fatigue Test Welded Joints Steel S960QL

Materials Science Forum ◽

10.4028/www.scientific.net/msf.726.93 ◽

2012 ◽

Vol 726 ◽

pp. 93-99

Author(s):

Czesław Goss ◽

Paweł Marecki

Keyword(s):

Stress Concentration ◽

Residual Stresses ◽

Fatigue Test ◽

Stress Concentration Factor ◽

Welded Joints ◽

Concentration Factor ◽

Test Results ◽

Butt Joints ◽

Considerable Research

Test results of residual stresses in welded butt joints were also presented. Finite Elments Methods and Jewdokimow and Lawrance’a methods of stress concentration factor αk calculation were comparative sumarized. Presents results is a part more considerable research attendant bridge MS-20.

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