TY - JOUR

T1 - Multiaxial fatigue criteria for prestressed strengthening of steel connections

AU - Heydarinouri, Hossein

AU - Nussbaumer, Alain

AU - Motavalli, Masoud

AU - Ghafoori, Elyas

N1 - Funding Information: The authors acknowledge the Innosuisse Swiss Innovation Agency (Grant ID: 19240.1 PFIW-IW) for funding this research project. The financial and technical support from the project partners, namely S&P Clever Reinforcement Company AG, Switzerland; the Swiss Federal Railways (SBB) AG, Bern; and dsp Ingenieure + Planer AG Engineering Office, Uster, Switzerland are highly appreciated. Special thanks go to the teams of the Structural Engineering Research Laboratory of Empa (Dübendorf, Switzerland). The authors also appreciate Dr. Hans-Jakob Schindler at Mat-Tec AG, Switzerland, for his support in measuring the residual stresses. Publisher Copyright: © 2021 The Author(s)

PY - 2021/12

Y1 - 2021/12

N2 - In this study, the high-cycle fatigue behavior of bridge connections subjected to distortion-induced loadings (generating multiaxial stresses) and strengthened with prestressed elements were experimentally investigated. Thereafter, appropriate critical plane-based multiaxial fatigue thresholds based on the modified Wohler curve method (MWCM) and Fatemi-Socie's (FS) criteria were used to predict the initiation of cracks in the angles considering the estimated fully reversed uniaxial and shear fatigue limits as well as residual stresses. The prestressed strengthening system was effective in reducing the mean values as a result of the prestressing force, enabling a shift in the stress state to below the initiation threshold.

AB - In this study, the high-cycle fatigue behavior of bridge connections subjected to distortion-induced loadings (generating multiaxial stresses) and strengthened with prestressed elements were experimentally investigated. Thereafter, appropriate critical plane-based multiaxial fatigue thresholds based on the modified Wohler curve method (MWCM) and Fatemi-Socie's (FS) criteria were used to predict the initiation of cracks in the angles considering the estimated fully reversed uniaxial and shear fatigue limits as well as residual stresses. The prestressed strengthening system was effective in reducing the mean values as a result of the prestressing force, enabling a shift in the stress state to below the initiation threshold.

KW - Angle connections

KW - Crack initiation

KW - Critical plane approach

KW - Distortion-induced loading

KW - Multiaxial fatigue

UR - http://www.scopus.com/inward/record.url?scp=85112270219&partnerID=8YFLogxK

U2 - 10.1016/j.ijfatigue.2021.106470

DO - 10.1016/j.ijfatigue.2021.106470

M3 - Article

AN - SCOPUS:85112270219

VL - 153

JO - International journal of fatigue

JF - International journal of fatigue

SN - 0142-1123

M1 - 106470

ER -