Resistance of I-girders to concentrated loads

Lagerqvist, Ove; Johansson, Bertil

doi:10.1016/s0143-974x(96)00023-5

Cited by 104 publications

(74 citation statements)

References 3 publications

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“…The elastic stress ( , Lagerqvist and Johansson [24] investigated the resistance of I-girders to concentrated loads. They presented the design model for the patch loading resistance of unstiffened plate girders.…”

Section: Stiffenersmentioning

confidence: 99%

Ultimate Capacity Assessment of Web Plate Beams With Pitting Corrosion Subjected to Patch Loading by Artificial Neural Networks

Sharifi¹,

Tohidi²

2014

Volume 10 Number 3

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ABSTRACT:Corrosion is an unavoidable phenomenon in ship hull structures and thickness loss of the structural members due to corrosion is a great concern when the integrity of hull structures is considered. It is well known that pitting corrosion occurring on coated hold frames will surely result in a significant degradation of the ultimate strength of these members. Extensive study on the effect of pitting corrosion on structural strength under a wide variety of loading conditions is necessary to assess the relationship between pitting corrosion intensity and residual strength precisely. The aim of the present study is to investigate the ultimate strength characteristics of steel beams with pit and uniform corrosions wastage. Then pitted member will predict with a member that its thickness decreases uniformly in terms of ultimate strength. A series of ABAQUS nonlinear elastic-plastic analyses by Finite Element Method (FEM) has been carried out on I-shape section steel models, varying the degree of pit corrosion intensity. Load-carrying capacity of deteriorated steel beam models with different pit corrosion under patch loading has been estimated using Artificial Neural Network (ANN) method using FE results. The ultimate strength reduction factor due to web pitting corrosion of steel beams is empirically derived by ANNs of the computed results as a function of DOP. Hence, the results of this study can be used for better prediction of the failure of deteriorated steel beams by practice engineers.

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Section: Stiffenersmentioning

confidence: 99%

Ultimate Capacity Assessment of Web Plate Beams With Pitting Corrosion Subjected to Patch Loading by Artificial Neural Networks

Sharifi¹,

Tohidi²

2014

Volume 10 Number 3

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“…Besides the exact stress function in the girder web, the introduction of flange in the stability analysis of I-girder through a series of effects (elastic restraint of edges on the web-flange junctions; bending, axial and torsional stiffness of the flange; load propagation through the flange) increases the value of the buckling coefficient. The aforementioned thesis has been studied by numerous authors [3][4][5][6] and this primarily through numerical analyses based on the finite element method, so as to take into account the complexity of the problem and a large number of parameters that affect the critical load intensity of thin-walled I-girders. Lagerqvist and Johansson [3] have studied the influence of flanges on the elastic stability of I-girders, as well as the impact of the loading length on critical load.…”

Section: Figure 1 Thin-walled I-girder Subjected To Patch Loadmentioning

confidence: 99%

“…The aforementioned thesis has been studied by numerous authors [3][4][5][6] and this primarily through numerical analyses based on the finite element method, so as to take into account the complexity of the problem and a large number of parameters that affect the critical load intensity of thin-walled I-girders. Lagerqvist and Johansson [3] have studied the influence of flanges on the elastic stability of I-girders, as well as the impact of the loading length on critical load. Based on the aforementioned numerical study, an expression for calculating the buckling coefficient of thin-walled I-girders under the patch loading is suggested.…”

Section: Figure 1 Thin-walled I-girder Subjected To Patch Loadmentioning

confidence: 99%

Analysis of flange impact on critical patch load of thin-walled I-girders

2014

JCE

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Analysis of flange impact on critical patch load of thin-walled I-girdersA numerical analysis of the flange impact on the critical load level of thin-walled I-girders subjected to patch load with special emphasis on the influence of shear stress in the zone of transverse stiffeners and shear stress at the flange-web junction on the girders response, is presented in this paper. The analysis is done by forming a 3D model in Abaqus software based on the finite element method, through variation of flange to web thickness ratio. 2D numerical models of girders web as isolated plate are also created. Matching of the 2D numerical results with results of existing analytical model, is the real basis for the expected accuracy of the 3D model. Key words:Elastic stability, thin-walled I-girders, patch load, numerical analysis, shear stress Prethodno priopćenje Milivoje Rogač, Olga Mijušković, Duško Lučić, Srđa Aleksić Analiza utjecaja pojasnica na kritično koncentrirano opterećenje tankostijenog I-nosača U radu je prikazana numerička analiza utjecaja pojasnica na razinu kritičnog opterećenja tankostijenog I-nosača opterećenog koncentriranim opterećenjem. Analiza je provedena formiranjem 3D modela u programskom paketu Abaqus na temelju metode konačnih elemenata, varirajući odnos debljine pojasnica prema debljini hrpta. Podudaranje rezultata 2D numeričkih modela hrpta nosača kao izdvojene ploče s rezultatima postojećeg analitičkog modela predstavlja realnu osnovu na kojoj se temelji očekivana točnost 3D modela.

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“…The simplified model for predicting the force-displacement behaviour of the compression zone at elevated temperatures consists of three parts, of which the firstly is an approach for the ultimate resistance, based on a proposal by Lagerqvist and Johansson (1996). This assumes a series of plastic hinges forming in the column flange in combination with yielding of the web.…”

Section: Simplified Model Of the Compression Zonementioning

confidence: 99%

High-temperature experiments on joint component behaviour

Block

Burgess

Davison

et al. 2005

Fourth International Conference on Advances in Steel Structures

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This paper describes the comparison of a series of high-temperature experiments on column webs under transverse compression at different axial load ratios and temperatures with a simplified design approach. The study forms a part of an ongoing project aimed at developing high-temperature models for the behaviour of the main components of steel end-plate beam-to-column connections in fire. In this particular phase of the work the emphasis is on the compression zone in the column web, when transverse compression acts simultaneously with axial compression due to superstructure loading. The ultimate objective is to be able to construct component-based models of end-plate joints in global numerical modelling of steel and composite building structures in fire conditions. This is the only feasible analytical approach to joint modelling under the simultaneous effects of loading, thermal degradation of materials and forces due to restraint to thermal expansion.

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Resistance of I-girders to concentrated loads

Cited by 104 publications

References 3 publications

Ultimate Capacity Assessment of Web Plate Beams With Pitting Corrosion Subjected to Patch Loading by Artificial Neural Networks

Ultimate Capacity Assessment of Web Plate Beams With Pitting Corrosion Subjected to Patch Loading by Artificial Neural Networks

Analysis of flange impact on critical patch load of thin-walled I-girders

High-temperature experiments on joint component behaviour

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