Uplift response of symmetrical anchor plates in non-reinforced and reinforced sand using geogrid and grid fixed reinforced
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Date
2013
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Publisher
Universiti Teknologi Malaysia
Abstract
Anchors with symmetrical plates are typically fixed to the structure and embedded in the ground to effective depth so that they can resist uplift load. This research is focused to improve the existing symmetrical anchor plate system by introducing Geogrid and Grid Fixed Reinforced (GFR) as a new system for ground anchor. The symmetrical anchor plates consist of three different shapes that represent the square, circular and the rectangular. For each shape, three series of anchor system were tested. The first series was the symmetrical anchor plates with sand as backfill. The second series included the Geogrid that was placed in several layers in the backfill. The third series introduced the GFR to tie up the Geogrid thus providing extra reinforcement to the backfill. GFR is a new tied up system with innovative design, made from fiber reinforcement polymer (FRP) which anchor the Geogrid into the soil. A series of numerical analyses using PLAXIS as finite element method software was carried out and the results were compared with the findings from the experimental model tests. The failure mechanism and the associated rupture surface were observed and discussed. It was found that inclusion of one layer of Geogrid on the symmetrical anchor plate improved the uplift capacity by 20% as compared to the same symmetrical anchor plate embedded without reinforcement. However with the inclusion of GFR the uplift respond improved further to 30%. The single layer Geogrid was also more effective in enhancing the uplift capacity compared to the multilayer Geogrid reinforcement although the single layer GFR gives higher uplift capacity as compared to single layer Geogrid.
Description
Thesis (PhD. (Civil Engineering))
Keywords
Anchorage (Structural engineering), Geogrids, Plates (Engineering)—Design and construction