Uplift Behavior of Conical Shape Anchors in Silty Sand

• Main Authors: Kuo, Chih-Ling, 郭芷伶
• Other Authors: Hsu,Shih-Tsung
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/16025251376850647562

碩士 === 朝陽科技大學 === 營建工程系碩士班 === 89 === ABSTRACT A series of triaxial tests for silty sand was performed to obtain the parameters needed for establishing a dilatant strain hardening-softening model, SHSE. The model and FLAC software are used to carry out the numerical analysis to study the anchorage behavior of cone-shape anchors in silty sand. To emphasize the feasibility of the numerical method, this research uses the results of field tests to verify the results of numerical analyses. It was found that the anchorage capacity come from frictional force and end resistance, but frictional force dominates the anchorage capacity, end resistance could be neglect. The pullout resistance increased with based diameter of anchors, free length and fixed length of anchors. As total length of anchor is less than 30m, the progressive yield was not evidence, so increasing fixed length is the most effective way to increase anchorage capacity. In addition, the anchor behavior predicted by numerical analyses are in good agreement with to the field tests. In order to reduce the time consumption for numerical study, the relationship between load and displacement are correlated with the relative density of sand, the free length, the based diameter of anchor. A simple program ”Conical Anchor” is then established. The program can significantly cut down the compute time. In addition, the anchor behavior predicted by this program is very closed to the field test.