PSI - Issue 41

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ScienceDirect

Procedia Structural Integrity 41 (2022) 183–191 Structural Integrity Procedia 00 (2022) 000–000 Structural Integrity Procedia 00 (2022) 000–000

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© 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the MedFract2Guest Editors. © 2022 The Authors. Published by Elsevier B.V. his is an open access article under the CC BY-NC-ND license (http: // creativec mmons.org / licenses / by-nc-nd / 4.0 / ) eer-review under responsibility of th MedFract2Guest Editors. Keywords: Net cross-section failure; Fatigue; Eurocode3; Tensile strength Abstract In Eurocode 3, a design rule is given for predicting the ultimate resistance of the net cross-section at bolt holes. This is based on the average stress evaluated in the net cross-section, and contains both a reduction factor of 0.9 and a partial factor. According to previous research, this reduction factor makes the design rule over-conservative for uncracked components. There are indications that this conservatism accounts for the possible presence of small cracks at the bolt holes. Very limited experimental research has been conducted on the influence of potential cracks at the bolt hole, particularly at the notch root. This paper presents a few experimental results on the ultimate load of pre-cracked notched plate specimens made of S275JR grade steel. Four pre-cracked specimens, with crack depths ranging from 1 to 7m , have been tested and their ultimate load has been compared with the one of non-pre-cracked specimens, exhibiting lower ultimate load and ductility as compared to the undamaged specimens. However, despite the significant pre-cracking, the ultimate strength is slightly lower than calculated with the design rule of Eurocode 3, considering mean material properties and excluding the partial factor. Moreover, the pre-cracked specimens have been assessed using a constraint-corrected version of the failure assessment diagram validating its prediction with the experimental results. © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Peer-review under responsibility of the MedFract2Guest Editors. Keywords: Net cross-section failure; Fatigue; Eurocode3; Tensile strength 2nd Mediterranean Conference on Fracture and Structural Integrity An experimental investigation on the net cross-section failure of damaged plates containing holes Hendrik Baarssen a , Jan-Willem van Maanen a , Davide Leonetti a, ∗ , H.H.(Bert) Snijder a a Eindhoven University of Technology, Department of the Built Environment, The Netherlands Abstract In Eurocode 3, a design rule is given for predicting the ultimate resistance of the net cross-section at bolt holes. This is based on the average stress evaluated in the net cross-section, and contains both a reduction factor of 0.9 and a partial factor. According to previous research, this reduction factor makes the design rule over-conservative for uncracked components. There are indications that this conservatism accounts for the possible presence of small cracks at the bolt holes. Very limited experimental research has been conducted on the influence of potential cracks at the bolt hole, particularly at the notch root. This paper presents a few experimental results on the ultimate load of pre-cracked notched plate specimens made of S275JR grade steel. Four pre-cracked specimens, with crack depths ranging from 1 to 7mm, have been tested and their ultimate load has been compared with the one of non-pre-cracked specimens, exhibiting lower ultimate load and ductility as compared to the undamaged specimens. However, despite the significant pre-cracking, the ultimate strength is slightly lower than calculated with the design rule of Eurocode 3, considering mean material properties and excluding the partial factor. Moreover, the pre-cracked specimens have been assessed using a constraint-corrected version of the failure assessment diagram validating its prediction with the experimental results. 2nd Mediterranean Conference on Fracture and Structural Integrity An experimental investigation on the net cross-section failure of damaged plates containing holes Hendrik Baarssen a , Jan-Willem van Maanen a , Davide Leonetti a, ∗ , H.H.(Bert) Snijder a a Eindhoven University of Technology, Department of the Built Environment, The Netherlands

1. Introduction 1. Introduction

The design rules of the Eurocode 3 CEN (2005a) cover a wide range of failure modes to guarantee the structural safety of steel structures consistently, spanning from plain material to notched components and structural connections. As in the case of a bolted connection, the presence of the holes in the plate reduces the cross-section area and induces stress concentration at the bolt hole, i.e. a notch. The notch root is identified in correspondence with the net cross section . In this case, yielding will more likely spread from the notch root through the most governing net cross section instead of the gross cross-section. Eurocode 3 provides a resistance model to predict the occurrence of this failure mode. According to clause 6.2.3 of EN 1993-1-1 CEN (2005a), the design tension resistance N t , Rd of the plate should always be greater than the design value of the tension force N Ed . The design tension resistance is defined as The design rules of the Eurocode 3 CEN (2005a) cover a wide range of failure modes to guarantee the structural safety of steel structures consistently, spanning from plain material to notched components and structural connections. As in the case of a bolted connection, the presence of the holes in the plate reduces the cross-section area and induces stress concentration at the bolt hole, i.e. a notch. The notch root is identified in correspondence with the net cross section . In this case, yielding will more likely spread from the notch root through the most governing net cross section instead of the gross cross-section. Eurocode 3 provides a resistance model to predict the occurrence of this failure mode. According to clause 6.2.3 of EN 1993-1-1 CEN (2005a), the design tension resistance N t , Rd of the plate should always be greater than the design value of the tension force N Ed . The design tension resistance is defined as

2452-3216 © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the MedFract2Guest Editors. 10.1016/j.prostr.2022.05.020 ∗ Corresponding author E-mail address: d.leonetti@tue.nl (Davide Leonetti). 2210-7843 © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Peer-review under responsibility of the MedFract2Guest Editors. ∗ Corresponding author E-mail address: d.leonetti@tue.nl (Davide Leonetti). 2210-7843 © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Peer-review under responsibility of the MedFract2Guest Editors.