Plate Anchor Groups Pulled Vertically in Sand

Vertical Uplift Capacity of Equally Spaced Multiple Strip Anchors in Sand

“…From Fig. 7a and b, it can be noted that the present experimental data provides relatively a little lower values of n c as compared to the experimental data of Hanna et al (1972) and Geddes and Murray (1996). It should also be noted that the tests' results of Hanna et al (1972) and Geddes and Murray (1996) also reveal that the magnitude of the efficiency factor for a given s/B for a group of 5 anchors in a single row becomes lower than that for 2 anchors.…”

“…In addition, the effect of embedment depth and friction angle of the soil mass on the uplift resistance is also examined. The results obtained from this research investigation were also compared with (1) the theory of Meyerhof and Adams (1968), and (2) the experimental results of Hanna et al (1972) and Geddes and Murray (1996) for a group of anchors. It is expected that the study will be helpful in determining the vertical uplift resistance of a group of multiple horizontal anchors.…”

“…However, at present, there is no exclusive research investigation, either experimental or theoretical, from which the ultimate pullout capacity of interfering strip anchors, having Fig. 7 A comparison of n c obtained from the present study with the experimental data of (a) Hanna et al (1972) for circular anchors; and (b) Geddes and Murray (1996) for square anchors Geotech Geol Eng (2009) 27:461-472 469 different sizes, can be assessed. In order to explore explicitly the effect of the size of the anchor plate on the results, in the present study, a few uplift tests on anchors, involving an isolated anchor as well a group of multiple strip anchors, were also performed by employing an additional size of the anchor plate (4 cm 9 36 cm).…”

“…Figure 7a provides a comparison of the experimental data of Hanna et al (1972) for a group of 2 and 5 numbers of circular anchors in a single row (for k = 6 and / = 37°) with the present experimental data (for k = 4 and 6 with / = 37.4°). The experimental data of Geddes and Murray (1996) for a group of 2 and 5 square anchors in a single row (with k = 4, / = 43.6°) was also compared with the present experimental data (for k = 3 and 5, with / = 44.8°); this comparison is illustrated in Fig. 7b.…”

“…However, the information available on determining the vertical uplift resistance of a group of horizontal anchors is rather limited. A theoretical solution for this problem was provided by Meyerhof and Adams (1968) on the basis of the limit equilibrium method, and a few small scale model tests were later performed in sand by Hanna et al (1972) on a group of circular anchors, and Geddes and Murray (1996) on a group of square anchors. Apart from these research investigations, there is hardly any other data in literature which deals with the determination of the pullout capacity of a group of horizontal anchors.…”