| Title |
Field Pull-out Test and 3-D FEM Analysis for Steel Pipe Nailing Installed Foldable Wedge |
| Keywords |
steel pipe nailing;foldable wedge;pull-out test;3-D FEM analysis;강관네일;접이식 웨지;인발시험;3차원 유한요소해석 |
| Abstract |
In this study, field pull-out test and 3-D FEM analysis have been performed for examining and reflecting the behavior of steel pipe nailing installed foldable wedge. Field pull-out test was performed under various conditions. As a result, the steel pipe nailing installed foldable wedge has an effect of pull-out resistance increased about 30% in comparison with non-wedge type steel pipe nailing. Through back analysis in 3-D FEM for behavior of non-wedge type steel pipe nailing, friction characteristics between nail to soil was analyzed and obtained first consistent with field pull-out behavior. Then, the frictional characteristic was used for analyzing the behavior of the steel pipe nailing installed foldable wedge. The result was compared with the test results. Consequently, friction coefficient (μ) of about 1.2 between grout to soil leads to good agreement with analysis results and test results. And a limited pull-out resistance, T<SUB>L</SUB>?32 tonf is similar to field pull-out test result which is improved about 33% in comparison with non-wedge type steel pipe nailing"s T<SUB>L</SUB>?24 tonf. |