Multiaxial fatigue criteria for prestressed strengthening of steel connections

Published on Dec 1, 2021in International Journal of Fatigue4.369
· DOI :10.1016/J.IJFATIGUE.2021.106470
Hossein Heydarinouri (EPFL: École Polytechnique Fédérale de Lausanne), Alain Nussbaumer23
Estimated H-index: 23
+ 1 AuthorsElyas Ghafoori23
Estimated H-index: 23
(Empa: Swiss Federal Laboratories for Materials Science and Technology)
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Abstract
References50
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#1Hossein Heydarinouri (Empa: Swiss Federal Laboratories for Materials Science and Technology)
#2Masoud Motavalli (Empa: Swiss Federal Laboratories for Materials Science and Technology)H-Index: 43
Last. Elyas Ghafoori (Empa: Swiss Federal Laboratories for Materials Science and Technology)H-Index: 23
view all 4 authors...
Abstract In this study, a mechanical anchorage for prestressed carbon fiber–reinforced polymer (CFRP) rods was proposed. The proposed anchorage consisted of a steel barrel with a conical hole and t...
3 CitationsSource
#1Hossein Heydarinouri (Empa: Swiss Federal Laboratories for Materials Science and Technology)
#2Alain Nussbaumer (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 23
Last. Elyas Ghafoori (Empa: Swiss Federal Laboratories for Materials Science and Technology)H-Index: 23
view all 4 authors...
Abstract This paper presented a new retrofit system for strengthening the stringer-to-floor-beam double-angle connections in a 92-year-old riveted railway bridge in Switzerland, using prestressed c...
3 CitationsSource
#1Hossein Heydarinouri (Empa: Swiss Federal Laboratories for Materials Science and Technology)
#2Masoud Motavalli (Empa: Swiss Federal Laboratories for Materials Science and Technology)H-Index: 43
Last. Elyas Ghafoori (Empa: Swiss Federal Laboratories for Materials Science and Technology)H-Index: 23
view all 4 authors...
AbstractStringer-to-floor beam web-to-web double-angle connections are among the most fatigue-prone elements in old riveted bridges. These connections are often designed to carry only shear loads. ...
5 CitationsSource
#1Davide LeonettiH-Index: 4
#2Johan Maljaars (TNO: Netherlands Organisation for Applied Scientific Research)H-Index: 16
Last. Giuseppe BrandoH-Index: 15
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Abstract Hot-riveted connections have been widely used in the past for metallic bridges, of which a large part is still in service, making relevant the assessment of their fatigue life. Previous studies have shown that the fatigue behavior of hot-riveted connections depends on many factors; among these, the residual tensile force in the rivets that clamps the plates together, i.e. the clamping force, is one of the most prone to uncertainty and scatter. Investigations p in the past made use of sp...
6 CitationsSource
#1Mohammadreza Izadi (UT: University of Tehran)H-Index: 6
#2Masoud Motavalli (UT: University of Tehran)H-Index: 43
Last. Elyas Ghafoori (Empa: Swiss Federal Laboratories for Materials Science and Technology)H-Index: 23
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Abstract Smart iron-based shape memory alloys (Fe-SMAs) are used in this study to retrofit fatigue-cracked riveted connections in steel bridges. The prestressed strengthening technique is found to be an effective approach to overcome fatigue-related damage in riveted connections. Because of the property of Fe-SMAs known as shape memory effect, these alloys can be prestressed without difficulty. The activated (i.e., prestressed) Fe-SMA strips (two 50-mm wide × 1.5-mm thick) are anchored to the fl...
20 CitationsSource
#1Ardalan Hosseini (Empa: Swiss Federal Laboratories for Materials Science and Technology)H-Index: 16
#2Julien Michels (Empa: Swiss Federal Laboratories for Materials Science and Technology)H-Index: 15
Last. Elyas Ghafoori (Empa: Swiss Federal Laboratories for Materials Science and Technology)H-Index: 23
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Abstract In the last two decades, carbon fiber reinforced polymer (CFRP) composites have been used for the strengthening of various civil structures. Since recently, iron-based shape memory alloy (Fe-SMA) has been introduced as a promising material, and Fe-SMA reinforcements have been utilized for prestressed strengthening of existing structures. This study aims to conduct a comparative analysis between the structural performance and cost of using Fe-SMA vs. CFRP reinforcements for the prestress...
15 CitationsSource
#1Ardalan Hosseini (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 16
#2Elyas Ghafoori (Swinburne University of Technology)H-Index: 23
Last. Masoud Motavalli (Monash University)H-Index: 43
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Abstract This paper summarizes the strengthening of a historically significant 122-year-old roadway metallic bridge using nonprestressed bonded carbon fiber reinforced polymer (CFRP) plates. Prior to the bridge strengthening, sets of laboratory tests were conducted to characterize the mechanical properties, glass transition temperature, and CFRP-to-steel bond strength of two different epoxy adhesives (linear and nonlinear) commonly used for structural retrofitting. Furthermore, the field applica...
38 CitationsSource
#1Hossein Heydarinouri (Empa: Swiss Federal Laboratories for Materials Science and Technology)
#2Alain Nussbaumer (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 23
Last. Elyas Ghafoori (Empa: Swiss Federal Laboratories for Materials Science and Technology)H-Index: 23
view all 4 authors...
Abstract Most existing guidelines and recommendations for the fatigue design of riveted members are not considering the effect of stress ratio on the constant amplitude fatigue limit (CAFL). However, fatigue test data show that there is a substantial influence of the stress ratio on the CAFL. In this study, a simple fatigue design criterion for riveted members is proposed taking into account the effect of stress ratio. The applied method is based on the constant life diagram (CLD) methodology. T...
4 CitationsSource
#1Ardalan Hosseini (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 16
#2Elyas Ghafoori (Swinburne University of Technology)H-Index: 23
Last. Riadh Al-Mahaidi (Swinburne University of Technology)H-Index: 46
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Abstract In this study, a novel retrofitting system is developed to strengthen existing metallic I-girders using prestressed unbonded carbon fiber reinforced polymer (CFRP) plates. The system relies on a pair of mechanical clamps. Each clamp holds two CFRP plates (each having cross-sectional dimensions of 50 × 1.4 mm) and anchors their prestressing forces to a metallic I-girder via friction. A finite element (FE) model was established to optimize the design of the required mechanical components,...
22 CitationsSource
#1Elyas Ghafoori (Swinburne University of Technology)H-Index: 23
#2Ardalan Hosseini (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 16
Last. Masoud Motavalli (Empa: Swiss Federal Laboratories for Materials Science and Technology)H-Index: 43
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Abstract This paper presents an application of prestressed carbon fiber-reinforced polymer (CFRP) plates for the strengthening of metallic girders of a roadway bridge in Melbourne, Australia. The study also describes the application of a wireless sensor network (WSN) system for long-term structural monitoring of the retrofitted bridge girders. A flat prestressed unbonded retrofit (FPUR) system was developed to apply prestressed CFRP plates to the steel girders of the Diamond Creek Bridge (122 ye...
43 CitationsSource
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