Optical Fiber Strain Measurements and Numerical Modeling of Load Tests on Grouted Anchors

Smet, Jef De; Huybrechts, Noël; Lysebetten, Gust Van; Verstraelen, Jan; François, Stijn

doi:10.1061/(asce)gt.1943-5606.0002167

Cited by 9 publications

(5 citation statements)

References 13 publications

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“…The surrounding soil has been simulated by a nonlinear spring model governed by a (t-z) hyperbolic relation. Authors in [6] used a one-dimension finite element to simulate an instrumented field test of grouted ground anchor. Spring elements have been used to model separately the strands and the grout.…”

Section: Imentioning

confidence: 99%

“…An elastic-perfectly plastic model has been used to simulate the pile shaft resistance, [2,[9][10][11][12]. It has been also used to model the grout-soil interface in grouted ground anchors [6,[13][14][15]. As shown in Figure 2, the y axis represents a percent of the mobilized shear stress along with the anchorsoil interface τ to maximum shear stress (τ max ), which is calculated by [16]:…”

Section: A Soil-grout Interface Modelingmentioning

confidence: 99%

“… Adding the calculated above initial stiffness of soil spring, to the global stiffness matrix, as presented in (6).…”

Section: Wwwetasrcom Al-baghdadi Et Al: One-dimension Finite Element ...mentioning

confidence: 99%

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One-Dimension Finite Element Modeling of Grouted Ground Anchor

Al-Baghdadi

Ahmed²,

Aljorany³

2022

Eng. Technol. Appl. Sci. Res.

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In the present research work, a one-dimension finite element model has been developed to simulate both compression and tension types of grouted ground anchors. The steel tendon-grout interface has been modeled by using the local bond-slip model, while the soil-grout interface has been modeled with a series of perfectly elastic plastic springs. The verification of the proposed one-dimension finite element model has been made by comparison of the model results with a three-dimension finite element model developed by commercial finite element software PLAXIS, and with the results of field tests of tension-type grouted ground anchor. A parametric study has been made to study the load-transfer mechanism for both types of anchors, compression, and tension. The compression-type anchor exhibits less displacement than the tension one under the same applied load. The developed strain in the grouted body of the compression-type anchor is much smaller than the tension-type one, regardless of the type of strain.

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Section: Imentioning

confidence: 99%

Section: A Soil-grout Interface Modelingmentioning

confidence: 99%

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One-Dimension Finite Element Modeling of Grouted Ground Anchor

Al-Baghdadi

Ahmed²,

Aljorany³

2022

Eng. Technol. Appl. Sci. Res.

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“…As students master the key steps of a structural analysis, they easily customize and extend the Stabil toolbox for their specific problems. This has resulted in a variety of applications, ranging from uncertainty quantification in structural dynamics [41], optimization of frame structures [40,46], geotechnical applications such as dynamic soil‐structure interaction [16,31] and modeling of grouted anchors in soils [43], to phase‐field modeling of brittle and ductile fracture [44,47].…”

Section: The Use Of Stabil Throughout the Curriculummentioning

confidence: 99%

Stabil: An educational Matlab toolbox for static and dynamic structural analysis

François

Schevenels

Dooms

et al. 2021

Comp Applic In Engineering

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The capability to analyze structures under static and dynamic loads is an essential skill for structural engineers. Structural analysis therefore is a key component in civil and architectural engineering education, where analytical methods are traditionally complemented by the use of (commercial) software packages. The latter are often closed source, which may obscure the links to the underlying matrix structural analysis or finite element formulation. To stimulate active, cooperative, and solution‐oriented learning, we developed Stabil, an electronic learning environment implemented as a Matlab toolbox. Stabil has an open structure to elucidate the links between theory and implementation and is presently used throughout the curricula of Civil and Architectural Engineering at KU Leuven. This paper explains the main principles of Stabil and discusses teaching experiences over the past 15 years. Stabil can be downloaded from http://bwk.kuleuven.be/bwm/stabil.

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“…Recently, the development of the fiber optic technology allowed some detailed measurements of the strain distribution along the entire bar. Iten and Puzrin, 2010 [7]; Huang et al, 2013 [8]; Zeni et al, 2015 [9] and Smet et al (2019) [10] provided interesting analysis of fiber optic strain measurements during load tests on grouted anchors. It is worth noting that most of the monitored anchors had a short fixed length, usually not exceeding 10 m. This choice agrees with many recommendations that suggest limiting the fixed length of the anchor to avoid possible progressive failure phenomena due to the highly non-uniform mobilization of bond stress along the foundation length (Barley, 1997 [11]; Woods and Barkhordari, 1997 [12]).…”

Section: Introductionmentioning

confidence: 99%

The Behavior of a Thread-Bar Grouted Anchor in Soils from Local Strain Monitoring

2020

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International standards discourage the use of grouted anchors with a fixed length exceeding 10 m. However, grouted anchors with a fixed length between 10 and 20 m are frequently used in Italy to transfer high loads to ground with poor geotechnical properties. This paper presents the results of investigation tests on an anchor with a length of 36 m, of which 18 m is fixed, sloping 40° from the horizontal; the anchor is comprised of a reinforced thread-bar which was instrumented with strain gauges and founded in nonhomogeneous ground, a sand deposit followed by marly clay. The test aimed at investigating the progressive mobilization of the shear strength along the foundation. The results indicate a very low shear strength offered by the sand, probably disturbed by the drilling, and an unusually fast mobilization of the shear strength in the marly clay at the deep end of the anchor. The results are particularly useful to identify the reasons for the observed poor performance of the grouted anchor. In particular, the study once again made it clear how important the influence of the execution details on reaching the expected load capacity may be, and likewise the practice of investigation tests on suitably instrumented test anchors.

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Optical Fiber Strain Measurements and Numerical Modeling of Load Tests on Grouted Anchors

Cited by 9 publications

References 13 publications

One-Dimension Finite Element Modeling of Grouted Ground Anchor

One-Dimension Finite Element Modeling of Grouted Ground Anchor

Stabil: An educational Matlab toolbox for static and dynamic structural analysis

The Behavior of a Thread-Bar Grouted Anchor in Soils from Local Strain Monitoring

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