3D FE analysis of anchor bolts with large embedment depths

Ožbolt, Joško; Eligehausen, Rolf; Periškić, Goran; Mayer, Utz

doi:10.1016/j.engfracmech.2006.01.019

Cited by 70 publications

(33 citation statements)

References 6 publications

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“…For each loading rate the relative nominal strength is calculated as the ratio between the nominal strength and the nominal strength for hef = 150 mm ( N,150 ). The results of analysis without loading rate confirm previous results obtained in [13] Furthermore, it can be seen that by increase of the loading rate, the size effect becomes stronger, i.e. the reduction of the nominal strength for larger embedment depths is larger at higher loading rates.…”

Section: Static Analysissupporting

confidence: 81%

“…From results it can be seen that in the experiments and in the analysis there is a similar increase of the resistance when the loading rate increases. Numerical studies, in which the rate sensitivity was not considered, show that for anchors with relatively small head sizes the size effect is close to the prediction according to LEFM [13]. However, it has been recently shown [13] that for larger head sizes, such as were used in the present study, the size effect obtained in experiments and in quasi static FE analysis is weaker than the prediction based on LEFM.…”

Section: Static Analysiscontrasting

confidence: 41%

“…Numerical studies, in which the rate sensitivity was not considered, show that for anchors with relatively small head sizes the size effect is close to the prediction according to LEFM [13]. However, it has been recently shown [13] that for larger head sizes, such as were used in the present study, the size effect obtained in experiments and in quasi static FE analysis is weaker than the prediction based on LEFM. In Figure 6b, the relative nominal pull-out strength for all loading rates is plotted as a function of the embedment depth.…”

Section: Static Analysiscontrasting

confidence: 41%

See 2 more Smart Citations

Investigation on influence of the loading rate on concrete cone failure

Meštrović¹,

Ivić²,

Čizmar³

2015

Materials Characterisation VII

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The loading rate significantly influences structural response. The structural response depends on the loading rate through three different effects: through the creep of the bulk material between the cracks, through the rate dependency of the growing microcracks and through the influence of structural inertia forces. The first effect is important only at extremely slow loading rates whereas the second and third effects dominate at higher loading rates. In this paper, a rate sensitive model, which is based on the energy activation theory of bond rupture and its implementation into the microplane model for concrete are given. To investigate the importance of the rate of the growing microcracks and the influence of structural inertia, static and dynamic analyses were carried out. The results show that with an increase of the loading rate, the pull-out resistance increases. The comparison between model prediction and test data for uniaxial compression failure of concrete shows that the model realistically predicts the influence of the loading rate on the compressive strength and initial Young's modulus.

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Section: Static Analysissupporting

confidence: 81%

Section: Static Analysiscontrasting

confidence: 41%

Section: Static Analysiscontrasting

confidence: 41%

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Investigation on influence of the loading rate on concrete cone failure

Meštrović¹,

Ivić²,

Čizmar³

2015

Materials Characterisation VII

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“…In their study, they observed a linear increase in capacity for embedded lengths from 20 to 70 mm and a very quick increase from 70 to 100 mm for different concrete compressive strengths. Ozbolt et al [6] prepared a 3D FE model to study the effect of embedded length on the ultimate capacity of an anchor system. Embedded lengths from 50 to 1600 mm are tested.…”

Section: Types Of Failures In Anchor Systems Under Tensile Loadmentioning

confidence: 99%

Creep Design of Epoxy Bonded Anchor System

Yang

Thota

Zhao

2014

Mechanics of Advanced Materials and Structures

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This article presents a systematic study on creep design of epoxy bonded anchor system. First, a theoretical model for prediction of long-term performance of an anchor system is suggested assuming epoxy layer following Maxwell visco-elastic behavior, which is then validated through an ABAQUS numerical model. A close match between the ABAQUS result and the theoretical model has been reached. Next, a general-purpose methodology for estimating creep capacity of an adhesive bonded anchor system is suggested following AC58 and two creep capacity equations are reached for Model Dry Epoxy and Model Wet Epoxy bonded anchor systems. The derived creep capacity is then used to re-examine the Boston D Tunnel anchor design and a safe design is reached through the suggested method considering the anchor system's long-term creep performance. Last, the ABAQUS model is extended to include the effect of curing temperatures, which shows significant influences of curing temperature on the capacity of an epoxy bonded anchor system.

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“…Even though the special foundation configuration of wind turbine towers is not presented as a total, very important details can be borrowed from the analysis of headed studs in the above mentioned document. The case of wind turbine towers foundations shows also great similarity with nuclear power plants foundations and in the work of Ozbolt et al (2007) experimental and numerical results of such anchors with large embedment depths are compared. The importance of the concrete cone resistance is highlighted and the pull-out resistance of the bolts is proved numerically to increase with the increase of the bolt head.…”

Section: Introductionmentioning

confidence: 99%

Verification of Anchoring in Foundations of Wind Turbine Towers

Stavridou¹,

Efthymiou²,

Baniotopoulos³

2015

American Journal of Engineering and Applied Sciences

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Tubular steel towers are the most common supporting structure of wind converters. The towers' foundation covers an important part of the initial cost and its configuration depends heavily on the type of subsoil. Onshore structures are founded on spread footing foundations or pile foundations with the first being the commonest. In these spread footing foundations, the tower is either embedded in the concrete foundation slab or the tower bottom flange is anchored to the concrete by means of pretensioned bolts. This anchoring of the steel tower on the concrete foundation is very rarely analyzed separately and recent failures due to inadequate design have alerted the wind industry towards the solution of the problem. For the purposes of the analytical and numerical approaches, two alternative types of foundation dimensioning are investigated. The tower properties of the two configurations are the same, providing the same loading and material data. The analytical study of the foundation anchoring is performed with the use of the equivalent ring method and the numerical verification of the two foundation solutions is performed with the use of a detailed micro model. The same micro model is used for the calculation of the fatigue life of the tower bottom joint following the damage accumulation method. In both foundation solutions, the total cross sectional area of the anchor bolts is proved to be the decisive factor for the selection of bolt size and number. The size of the tower bottom diameter plays also an important role on the maximum number and size of bolts used. Both analytical and numerical results are in good agreement and valuable outcomes are emerging from the comparative study on the foundation dimensioning of contemporary structures.

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3D FE analysis of anchor bolts with large embedment depths

Cited by 70 publications

References 6 publications

Investigation on influence of the loading rate on concrete cone failure

Investigation on influence of the loading rate on concrete cone failure

Creep Design of Epoxy Bonded Anchor System

Verification of Anchoring in Foundations of Wind Turbine Towers

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