Experimental investigation of forces along anchors subjected to dynamic loading under tension and compression in field tests

Platzer, K.; Wendeler, Corinna; Brändle, Rico; Stolz, Martin

doi:10.1139/cgj-2018-0144

Cited by 5 publications

(2 citation statements)

References 10 publications

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“…This increase in the stiffness response of anchor T33 can be attributed to the improvement of the interface shear strength (skin friction) on the bonded length after the previous loading-unloading sequences in the suitability test (Section 3.4). This phenomenon has also been identified by Platzer et al [32].…”

Section: Pullout Test Resultssupporting

confidence: 76%

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Load transfer on instrumented prestressed ground anchors in sandy soil

Sousa

Costa

Florêncio

et al. 2021

Rev. IBRACON Estrut. Mater.

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This study evaluates load variations in instrumented prestressed ground anchors installed in a bored pile retaining wall system in sandy soil. Data were collected from instrumentation assembled in the bonded length of three anchors, which were monitored during pullout tests and during different construction phases of the retaining wall system. Instrumentation consisted of electrical resistance strain gauges positioned in five different sections along the bonded length. Skin friction distributions were obtained from the field load measurements. Results showed that the skin friction followed a non-uniform distribution along the anchor bonded length. The mobilized skin friction concentrated more intensely on the bonded length half closest to the unbonded length, while the other half of the bonded length developed very small skin friction. The contribution of the unbonded length skin friction to the overall anchor capacity was significant and this should be accounted for in the interpretation of routine anchor testing results. Displacements applied to the anchor head were sufficient to mobilize the ultimate skin friction on the unbonded length, but not on the bonded length. Performance of loading-unloading stages on the ground anchor intensified the transfer of load from the unbonded length to the bonded length. Long-term monitoring of the anchor after lock-off revealed that the load at the anchor bonded length followed a tendency to reduce with time and was not significantly influenced by the retaining wall construction phases.

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Section: Pullout Test Resultssupporting

confidence: 76%

“…Platzer et al [32] conducted a study focusing on the compressive behavior of piles and tensile behavior of ground anchors embedded in cohesionless soils and subjected to dynamic loading. The bonded length of the anchors measured 5.1 m and was instrumented with four strain-gauge sections.…”

Section: Load Transfer Evaluation From Ground Anchor Monitoringmentioning

confidence: 99%

Load transfer on instrumented prestressed ground anchors in sandy soil

Sousa

Costa

Florêncio

et al. 2021

Rev. IBRACON Estrut. Mater.

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Towards an Optimization of Foundation Anchors of Landslide-Resisting Flexible Barriers: Dynamic Pullout Resistance of Anchors

Choi,

Zhang,

Xiong

2024

Progress in Landslide Research and Technology

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Existing research on the design of flexible barriers to arrest the landslide mass mainly focuses on the optimization of the superstructure. Little attention has been given to the optimization of the foundation anchors used to transmit dynamic impact loading from the landslides to the ground. In fact, existing design guidelines for foundation anchors of landslide-resisting flexible barriers are based on quasi-static pullout theories even though field evidence suggests that the dynamic response of an anchor is fundamentally different. In this study, a new analytical model is proposed to predict the peak pullout resistance for anchors subjected to dynamic loading in saturated sand. A novel experimental apparatus was developed to evaluate the proposed analytical model. Dynamic effects are profound in saturated sand and less so in dry sand. Rate strengthening at the soil-anchor interface is governed by pore pressure change from dilation and soil damping. The proposed model is shown to give close predictions of the measured peak dynamic pullout resistance, which is up to three times those under quasi-static conditions. Findings imply that rate strengthening changes the critical failure mechanism of a foundation anchor from the soil-anchor interface for quasi-static loading to the potential rupturing of the steel tendon for dynamic loading. This study highlights the need for the dynamic analysis of foundation anchors of landslide-resisting flexible barriers.

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