Abstract This paper presents a new fatigue model to predict life of steel bridges considering the effect of high amplitude loading. It consists of a modified strain-life curve and a new strain based damage index. Modified strain-life curve consists of Coffin-Manson relation in low cycle fatigue region and a new strain-life curve in high cycle fatigue region. The damage variable is based on a modified von Mises equivalent strain to account for the effects of loading nonproportionality and strain path orientation in multiaxial stress state. The proposed model was verified with experimental test results of two materials available on the literature. Then, it was illustrated with an old riveted wrought iron railway bridge. The obtained results verify the effectiveness of the proposed model over commonly used Miner's rule based life prediction of steel bridges.
[1]
Y. Kondo,et al.
The effect of seismic loading on the fatigue strength of welded joints
,
2007
.
[3]
Ali Fatemi,et al.
Variable amplitude cyclic deformation and fatigue behaviour of stainless steel 304L including step, periodic, and random loadings
,
2010
.
[4]
S. Suresh.
Fatigue of materials
,
1991
.
[5]
Mitao Ohga,et al.
Application of new damage indicator-based sequential law for remaining fatigue life estimation of railway bridges
,
2008
.
[6]
M. V. Borodii,et al.
Life assessment for metallic materials with the use of the strain criterion for low-cycle fatigue
,
2009
.
[7]
Gopal S. Upadhyaya,et al.
Material Science and Engineering
,
2007
.