Pullout capacity of vertical ground anchor in homogeneous sand
Vertical ground anchors are commonly used in foundation systems for structures requiring pullout resistance such as transmission towers, structures requiring lateral resistance, such as sheet pile walls. The work described in this research was primarily concerned with the pullout capacity of a verti...
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| Format: | Thesis |
| Language: | English English |
| Published: |
2011
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| Subjects: | |
| Online Access: | https://eprints.ums.edu.my/id/eprint/40605/1/24%20PAGES.pdf https://eprints.ums.edu.my/id/eprint/40605/2/FULLTEXT.pdf |
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| Summary: | Vertical ground anchors are commonly used in foundation systems for structures requiring pullout resistance such as transmission towers, structures requiring lateral resistance, such as sheet pile walls. The work described in this research was primarily concerned with the pullout capacity of a vertical ground anchor embedded in dry homogeneous sand. One-laboratory model of anchor test apparatus is fabricated, with dry sand as a medium in sand box to form the homogeneous sand bed. Three models of circular anchors namely 25, 50 and 75 mm diameter and three states of homogeneous sand bed with different unit weights i.e., 15.89, 16.29 and 17.13 kN/m³ , where the relative densities are 29%, 37% and 53% respectively were used in this research. The range of depth/ diameter (D/B) ratios are from 1 to 24 in order to cover shallow and deep anchors with the anchors being subjected to vertical loads under displacement control. A delineation technique is used to define the general failure surface of anchor in the soil mass during pullout. From the test, results show that the behavior and general failure surface of vertical ground anchor in dry homogeneous sand are similar to those reported by previous studies. The predicted formulae of pullout capacity for shallow and deep anchors in dry homogeneous sand are developed using semi-empirical method i.e., prediction of failure surface from pullout test and analytical method. From the comparison, results show that the predicted formula in similar trend with previous studies and experimental test. Overall, the study provides insights about pullout capacity of vertical ground anchor in homogeneous sand. At end of the research finding, suggestions are given for the further works in future. |
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