Effect of Relative Displacement of Strands Bent Over Circular Saddles on Fatigue Life Under Fretting Conditions
Effect of Relative Displacement of Strands Bent Over Circular Saddles on Fatigue Life Under Fretting Conditions
复制标题
圆形鞍座上弯曲钢绞线的相对位移对微动条件下疲劳寿命的影响
DOI:
10.1007/978-3-319-59471-2_263
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发表时间:
2017
期刊:
影响因子:
--
通讯作者:
Walbridge
中科院分区:
文献类型:
--
作者:
Mohareb;Goldack;Schlaich;Walbridge
High strength steel strands are widely used as main supporting elements in cable-stayed and extradosed bridges. Saddle systems have recently been introduced as an alternative to attaching the stays using anchor heads to pylons. As a drawback, strands installed in such systems are subjected, in addition to plain fatigue, to the fretting phenomenon, which accelerates fatigue damage and shortens the fatigue life of the strands.The tribological phenomenon of fretting occurs when two elements in contact are subjected to a small amount of cyclic relative displacement (up to 300 µm). Amongst other parameters, the relative displacement between the two elements plays an important role in determining the fatigue life of elements subjected to such conditions. During the last decades, the case of strands subjected to free-bending fatigue has been widely investigated, whereas the case of strands bent over bridge saddles has not been researched sufficiently. Until now, full saddle tests are the most convenient way for estimating the fatigue life of strands bent over saddles.Fibbulletin 30 gives detailed saddle test recommendations, which include the testing of the fretting phenomenon in the “entrance zone” of a bridge saddle. However, the suggested geometrical similarity constraints do not guarantee that the applied relative displacements in the test correspond to those of the real saddle.This paper provides a literature review of previous research concerning the role of relative displacement on the fatigue life of elements subjected to fretting, with a focus on high strength steel strand applications. In addition, it proposes a calculation method to map the expected relative displacement between strands and saddle along the whole contact perimeter. The study provides the fundamentals to include realistic relative displacements in revised recommendations for saddle tests and to develop an equivalent simple test that can replace the current full saddle tests.
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影响因子:
8.4
作者:
Dagang Wang;Dekun Zhang;S. Ge
通讯作者:
Dagang Wang;Dekun Zhang;S. Ge
DOI:
--
发表时间:
--
期刊:
影响因子:
--
作者:
J. A. Eytelwein
通讯作者:
J. A. Eytelwein
DOI:
--
发表时间:
1968
期刊:
影响因子:
--
作者:
K. Nishioka;K. Hirakawa
通讯作者:
K. Hirakawa
影响因子:
5
作者:
Ratsimba, CHH;McColl, IR;Soh, HP
通讯作者:
Soh, HP
影响因子:
3.6
作者:
Goldack;Schlaich;Meiselbach
通讯作者:
Meiselbach