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Patch loading resistance of welded I-beams: with respect to misaligned web stiffeners
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Steel Structures.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Steel Structures.
2016 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

When a concentrated load is introduced perpendicular to the flanges of a steel beam, this condition

is referred to as Patch loading (Gozzi, 2007). This occurrence is common in many steel

structures, for example at supports or during launching of bridges. Because of the usual slenderness

of I-beams and other plated structures, these are sometimes reinforced with stiffeners

in order to avoid buckling. Modifications, such as adding stiffeners to a beam, are done to

make greater plastic deformations possible before buckling can occur; thereby increasing the

resistance against failure.

Transverse stiffeners are added in areas where the beam is exposed to concentrated loads

(Lagerqvist, 1994). The descriptions of calculating patch loading in the Eurocode are presented

for cases of double stiffeners, with the load applied in between two stiffeners with

same distance to each of them, or when there is one single stiffener that is acting in line with

the load. In the Eurocode there are also descriptions on how to calculate on the resistance

against patch loading when there are no stiffeners added. However, the Eurocode lacks descriptions

for cases when the stiffeners are misaligned.

The purpose of this paper is the evaluation of the impact from transverse stiffeners to the resistance

of welded I-beams, when the stiffeners are misaligned and where the length of the

beam varies. Because of the complexity of such of problems it is almost impossible to find

theoretical solutions (Lagerqvist & Johansson, 1996). Therefore, in this study as well as in

almost all studies that aim to predict the ultimate resistances of steel beams subjected to patch

loading, the results are gained empirically. The tests herein were done by FE-modeling and

the results from the physical experiments done in Lagerkvist’s doctoral thesis were used for

validation of the model, as conducting experiments ourselves was not economically possible.

6

The study was made in two steps. In the first step FE-models were produced under the same

circumstances as the results obtained by Lagerqvist (1994). Those analyses were not part of

the aim of the study; the intention for making the initial analyses was to strengthen the reliability

of the results. From there, the final analyses were made with the aim in investigating the

influence of stiffeners on the resistance, when these are misaligned. In this step, observations

were also made with regards to the impact of the bending moment of the beam on its resistance.

The initial analyses, which were made for validation of the modeling, had a satisfying correspondence

to the physical experiments; hence the final analyses are assumed valid of acceptance.

From observations of the results in the final analyses it is noticed that adding stiffeners

is a highly preferred way of increasing the resistance for slender beams. For full utilization

it is however important to have the stiffeners optimally placed, because a small deviation

from this position gives an unwanted decrease in resistance.

Place, publisher, year, edition, pages
2016.
Series
TRITA-BKN-Examensarbete, ISSN 1103-4297 ; 477
Keyword [en]
Patch loading, Stiffeners, I-beam, Plated steel structures, Abaqus, Simply supported beam
National Category
Building Technologies
Identifiers
URN: urn:nbn:se:kth:diva-199213OAI: oai:DiVA.org:kth-199213DiVA, id: diva2:1060773
External cooperation
Dafina Zeka
Subject / course
Steel Structures
Educational program
Master of Science in Engineering - Urban Management
Supervisors
Examiners
Available from: 2017-02-02 Created: 2016-12-29 Last updated: 2017-02-03Bibliographically approved

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