Integrated Fatigue Life Evaluation Method for Members in Riveted Steel Truss Bridges

2021 ◽  
Vol 35 (4) ◽  
Author(s):  
Delong Guan ◽  
Yonghui An ◽  
Xin Xiao ◽  
Xinxin Zhao ◽  
Jinping Ou
Keyword(s):  
Fatigue Life ◽  
Evaluation Method ◽  
Truss Bridges ◽  
Life Evaluation ◽  
Steel Truss ◽  
Fatigue Life Evaluation ◽  
Steel Truss Bridges

The monitoring of temperature differences between steel truss members in long-span truss bridges compared with bridge design codes

2018 ◽  
Vol 22 (6) ◽  
pp. 1453-1466 ◽  
Author(s):  
Gaoxin Wang ◽  
Youliang Ding ◽  
Xingwang Liu
Keyword(s):  
Evaluation Method ◽  
Thermal Action ◽  
Transfer Characteristic ◽  
Primary Concern ◽  
Truss Bridges ◽  
Long Span ◽  
Steel Material ◽  
Steel Truss ◽  
Bridge Structures ◽  
Steel Truss Bridges

The temperature differences in bridge structures have been one primary concern for bridge engineers and researchers. In the traditional view, the temperature differences between steel truss members are treated as uniform because of the good heat transfer characteristic of steel material and the shading effect of deck coverage. However, for some steel truss bridges, some truss members are directly exposed to solar radiation, while some other truss members are totally shaded by steel decks, which may cause obvious temperature differences between them, so it is reasonable to doubt the correctness of uniform temperature existing between steel truss members. In this research, the temperature differences between steel truss members in two long-span truss bridges are analyzed using long-term temperature field data, and after analysis, the temperature differences which contain obvious positive or negative values are made clear. Furthermore, the evaluation method of temperature differences in bridge service life for thermal action design is put forward together with the determination method of probability density function, and the evaluated temperature differences are further obtained after probability statistics analysis. Finally, the evaluated temperature differences are classified by sun radiation and steel deck coverage, and then compared with the specified values in the three specifications. The research results can provide important reference for current specifications and structural design, especially for steel truss bridges.

Development of fatigue life evaluation method using small specimen

2013 ◽  
Vol 441 (1-3) ◽  
pp. 125-132 ◽  
Author(s):  
Shuhei Nogami ◽  
Arata Nishimura ◽  
Eichi Wakai ◽  
Hiroyasu Tanigawa ◽  
Takamoto Itoh ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Evaluation Method ◽  
Small Specimen ◽  
Life Evaluation ◽  
Fatigue Life Evaluation

scholarly journals Fatigue Life Evaluation Considering Fatigue Reliability and Fatigue Crack for FV520B-I in VHCF Regime Based on Fracture Mechanics

Metals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 371 ◽  
Author(s):  
Jinlong Wang ◽  
Yuxing Yang ◽  
Jing Yu ◽  
Jingsi Wang ◽  
Fengming Du ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Fracture Mechanics ◽  
Evaluation Method ◽  
Evaluation Model ◽  
Fatigue Cracking ◽  
High Strength ◽  
Fatigue Reliability ◽  
Life Evaluation ◽  
Fatigue Life Evaluation ◽  
Very High

This paper focuses on the fatigue reliability analysis and the development of a new life model of reliability and crack growth mechanisms in FV520B-I (high strength martensitic-type stainless steels) in the very-high cycle fatigue (VHCF) regime, which haven’t been studied well. First, the fatigue test was carried out to clarify the fatigue failure mechanism in the very-high cycle regime. Based on the test results and fatigue reliability theory, the fatigue life distribution and P-S-N curves were modeled. A new fatigue life evaluation model for FV520B-I is proposed according to the fracture mechanics and classic life evaluation method. With the comprehensive application of P-S-N curves and a new proposed fatigue life evaluation model, a new assumption of a P-Sc-N curve is developed and verified, to quantitatively express the relationship between fatigue life, reliability and fatigue cracking. This is novel and valuable for further fatigue study of FV520B-I.

Fatigue and Creep-Fatigue Life Evaluation of U-Shaped Bellows

1992 ◽  
Vol 114 (3) ◽  
pp. 280-291 ◽  
Author(s):  
K. Tsukimori ◽  
T. Yamashita ◽  
M. Kikuchi ◽  
K. Iwata ◽  
A. Imazu
Keyword(s):  
Fatigue Life ◽  
Evaluation Method ◽  
Strain Range ◽  
Creep Damage ◽  
Fatigue Tests ◽  
Reliable Operation ◽  
Life Evaluation ◽  
Creep Fatigue ◽  
Fatigue Life Evaluation ◽  
Rational Evaluation

For the reliable operation of bellows under cyclic loadings at high temperatures, a rational evaluation method of life of bellows would be needed. Authors investigated simplified analysis methods for fatigue and creep-fatigue life prediction of U-shaped bellows considering inelasticity as well as various geometrical nonuniformity such as thickness and shape of convolutions. A conservative evaluation method of the strain range is developed, introducing three strain range amplification factors for nominal elastic strain range. Creep and relaxation behaviors of bellows are studied. Consequently, a new evaluation method of creep damage fractions is proposed which depends upon the relation between primary and secondary stresses. Fatigue and creep-fatigue tests are conducted and the validity of the present methods is discussed.

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