Abstract
With an application of the upper bound finite element limit analysis, the vertical pullout capacity of a group of two horizontal strip plate anchors, with the common vertical axis and placed in a cohesive-frictional soil, has been computed. The variation of the uplift factors <i>F<sub>c</sub>, F<sub>q</sub></i> and <i>F<sub>y</sub></i>, due to the contributions of soil cohesion, surcharge pressure and unit weight, respectively, has been evaluated for different combinations of <i>S/B</i> and <i>H/B.</i> As compared to single isolated anchor, the group of two anchors generates significantly greater magnitude of <i>F<sub>c</sub></i> for Φ ≤ 20° especially with greater values of <i>H/B</i> and under fully bonded anchor-soil interface condition. The factor <i>F<sub>c</sub></i> attains almost the maximum value when the upper anchor plate is placed midway between ground surface and the lower anchor plate. The factors <i>F<sub>q</sub></i> and <i>F<sub>y</sub></i>, on the other hand, for a group of two anchors are found to remain almost equal to that of a single isolated anchor as long as the levels of the lower plate in the group and the single isolated anchor are kept the same.
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