Impact load effects on screw anchors in concrete

Abdul-Hamid, Aliu; Braimah, Abass; Tai, Fred

doi:10.1016/j.engstruct.2021.113491

Cited by 2 publications

(1 citation statement)

References 11 publications

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“…The portion allowed to yield plastically was not fully utilized in any case. Abdul-hamid [10] conducted impact experiments on mechanical screw anchors using impulsetype loading and noted that the anchoring system had high load carrying capacity under high strain rate loading conditions with recommended values of 1.1 and 1.2 for anchor Dif. Drop tests on d-bolts were conducted by Charlie [11]; the energy absorption of the d-type anchor cross-section was observed to be directly proportional to the volume of the anchor cross-section, tensile strength of the anchor material, and ultimate strain.…”

Section: Introductionmentioning

confidence: 99%

Study on Mechanical Response Characteristics of Anchor under Dynamic Disturbance

Yin,

Wang,

Chen

et al. 2024

Archives of Mining Sciences

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The roadway surrounding rock is often subjected to severe damage under dynamic loading at greater mining depths. To study the dynamic response of prestressed anchors, the damage characteristics of anchor solids with different prestresses and number of impacts under dynamic and static loads were investigated by improving the Hopkinson bar equipment. The effect of prestress on stress wave transmission was obtained, and the laws and reasons for axial force loss under static and dynamic loads were analyzed. The damage characteristics of anchor solids were determined experimentally. The results show that with an increase in prestress from 15 to 30 MPa, the peak value of the stress wave gradually increases and the decay rate gradually decreases. Shear damage occurred at the impact end of the specimen, combined tension and shear damage occurred at the free end, and fracture occurred in the middle. With an increase in the number of impacts, the damage to the anchor solid specimens gradually increased, and the prestressing force gradually decreased. After impact, the axial force of the various prestressed anchor solid specimens gradually increased; however, the anchor bar with a 17 MPa prestressing force had the slowest rate of axial force loss during impact, withstanding a greater number of impacts. In on-site applications, after three explosions, the displacement on both sides of the tunnel supported by 17 MPa prestressed anchor rods could be controlled within 0.3 m, with an average displacement of 206, 240, and 283 mm, respectively, increasing by 16.5% and 17.9%. This study, based on theoretical analysis and laboratory research combined with field application provides guidance for the anchor support of a dynamic loading tunnel.

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Section: Introductionmentioning

confidence: 99%

Study on Mechanical Response Characteristics of Anchor under Dynamic Disturbance

Yin,

Wang,

Chen

et al. 2024

Archives of Mining Sciences

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Seismic Performance of Drop-In Anchors in Concrete under Shear and Tension

Sennah,

Azimi,

Ahmed

et al. 2024

Buildings

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This paper presents an experimental study conducted on the behavior of drop-in anchors in uncracked concrete slabs. Both seismic (cyclic) load tests and static load tests to collapse are performed on drop-in anchors subjected to tension or shear forces. Three different anchor sizes are subjected to seismic qualification testing, followed by a static load test to collapse. The test results confirm the capability of the tested anchors to sustain simulated pulsating seismic tension and shear loading with frequency ranges between 0.1 and 2.0 Hz. It was observed that no tension failure occurred at the end of the cyclic load tests for all the tested anchors, and their residual inelastic maximum displacement at the end of the cyclic tension test was relatively small. Moreover, the experimental results show that the anchors’ ultimate capacities are higher than those specified by the anchor manufacturer. Finally, the anchors’ experimental pullout shear capacities are compared with the failure prediction equations in the literature and design codes. It is found that the theoretical models provide a conservative prediction of the concrete breakout of anchors in tension compared to the experimental ultimate loads. The coefficient for pry-out strength (kcp) equal to 2 or slightly smaller than 2 is likely to predict a better pry-out capacity with the experimental results compared to the application of the high conservative value of kcp equal to 1, as given in the code.

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Impact load effects on screw anchors in concrete

Cited by 2 publications

References 11 publications

Study on Mechanical Response Characteristics of Anchor under Dynamic Disturbance

Study on Mechanical Response Characteristics of Anchor under Dynamic Disturbance

Seismic Performance of Drop-In Anchors in Concrete under Shear and Tension

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