Fatigue strength of cope hole details in steel bridges

Miki, Chitoshi; Tateishi, Kensuke

doi:10.1016/s0142-1123(97)85727-1

Cited by 30 publications

(29 citation statements)

References 1 publication

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“…Note that from the strength standpoint, the hole causes local reduction in cross-section, thus its rigidity leading in consequence to significant stresses concentration near the toe of longitudinal weld connecting the strip with the web. Therefore, fatigue life of such joint is considerably lower, comparing to other structural details [4,5].…”

Section: Introductionmentioning

confidence: 97%

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Numerical investigation of the cope hole shape impact on fatigue life of welded joints in steel bridges

Śledziewski

2019

MATEC Web Conf.

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Holes in the bridge girders are usually made at the joint of strips. In most cases, they are made when there is a need to make double-sided butt welds and in order to avoid welds crossing. Size of the hole is selected in order to allow full penetration of the strips across their whole width and also to ensure free access to the welds during NDT. Welded joints with holes, due to low fatigue life, are critical elements affecting durability of large-span steel bridge structures. Low fatigue life of joints with holes results mostly from high concentration of stresses near the weld toe caused by local reduction of cross-section. The paper covers parametric studies based on finite elements method in order to determine the impact of geometrical changes of the hole shape on distribution of stresses within probable areas of cracks initiation and durability of such joint. With reference to experimental studies results, four different holes geometries were analysed: semi-circle (conventional), triangle, parabola of second degree and oval. Assessment of the fatigue was performed using the so-called hot spot method, i.e. geometrical stresses. Results of the studies show that geometrical change of the hole shape affects the stresses concentration change, but it does not translate to the increase of fatigue life of such joint.

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Section: Introductionmentioning

confidence: 97%

“…Relatively low class of the detail with simultaneous presence at the place, where significant loads are transferred, causes reduction of durability of the whole structural element [5]. Therefore, it is necessary to increase the fatigue life of such joint [7].…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of the cope hole shape impact on fatigue life of welded joints in steel bridges

Śledziewski

2019

MATEC Web Conf.

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“…The fatigue tests of the cope-hole details existing in the I-section beam bent in-planes were carried out. The fatigue strength and local stress were also investigated (Miki & Tateishi, 1997). Because of the local stress near the cope-hole, the fatigue strength of this detail was desperately low.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Life Assessment and Reliability Analysis of Cope-Hole Details in Steel Bridges

Liao

Wang

Zhang

et al. 2020

BJRBE

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Cope-hole details are widely applied to steel bridges. However, the safety of steel bridges is influenced by the fatigue performance of welded details. So, cope-hole details with flange and web subjected to axial loads were selected as the research object. Based on the basic theory of linear elastic fracture mechanics and the Finite Element Method, the stress intensity factors of cope-holes details were calculated. The influences of geometry size and crack size of the detail on the stress intensity factors were then investigated. The Paris model of fatigue crack propagation predicted the crack propagation life of cope-hole details. Besides, the fatigue limit-state equation was also established to analyse the effect of random variables (such as initial crack size, critical crack size, crack propagation parameter) on the fatigue reliability index. Finally, the recommended value of the detection period was present. The results show that the stress intensity factor gradually increases with the increase of the cope-hole radius, the weld size, the flange plate thickness, the crack length and the web thickness. However, it gradually decreases with the increase of the ratio of the long and short axle to the crack. The predicted number of fatigue cyclic loading required by the fatigue crack depth propagating from 0.5 mm to 16 mm under nominal stress amplitude of 63 MPa is 122.22 million times. The fatigue reliability index decreases with the fatigue growth parameter, the crack shape ratio and the mean of initial crack size increasing, which is relatively sensitive. However, the variation coefficient of the initial crack size has little effect on it. The detection period of cope-hole details is the service time corresponding to the fatigue accumulated cyclic loading of 198.3 million times.

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“…Chiew et al [2] conducted fatigue tests to measure and analyze fatigue strength and local stresses for cope-hole details existing in I-section beams bent in-planes. The research results indicated that the fatigue strength of copehole details was extremely low because of the local stress around the cope holes.…”

Section: Introductionmentioning

confidence: 99%

Stress concentration coefficients of optimized cope-hole welded detail

et al. 2017

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The fatigue performance of optimized welded detail has been investigated by fatigue experiments of three welded specimens under different loadings. In addition, local finite element models of this welded detail were established using finite element software ANSYS. The influences of different factors such as plate thickness, plate gap and initial geometric imperfections on the stress concentration coefficient (SCC) were discussed. The experimental results indicate that the fatigue life of three specimens for this welded detail is 736,000, 1,044,200 and 1,920,300 times, respectively. The web thickness, the filler plate thickness and the initial geometric imperfection have relatively less effect on the SCCs of this welded detail. However, cope-hole radius is influential on the SCCs of the web and the weld. The SCC of weld is significantly affected by the weld size and plate gap, but the SCCs of other parts of the welded detail are hardly affected by the plate gap.

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Fatigue strength of cope hole details in steel bridges

Cited by 30 publications

References 1 publication

Numerical investigation of the cope hole shape impact on fatigue life of welded joints in steel bridges

Numerical investigation of the cope hole shape impact on fatigue life of welded joints in steel bridges

Fatigue Life Assessment and Reliability Analysis of Cope-Hole Details in Steel Bridges

Stress concentration coefficients of optimized cope-hole welded detail

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