GEOTECHNICAL DESIGN OF GUYED MAST ANCHORS USING FINITE ELEMENT METHOD

摘要

Many different types of guyed mast anchors have been studied in order to optimize materials. The soil properties, the frictional and gravity forces are the main factors that define their design and stability according to guy tensions. This paper describes the investigation on geotechnical behavior of unconventional anchors designed with a small quantity of materials. Two types of anchors are compared: reversed T, and reversed T without retaining wall. The preliminary design was made using the global security factor method, with a factor value of 1.5. The comparison is based on simulations of the two types of anchors using the code ABAQUS 6.9-3, with Finite Element as the mathematical solution method. Two independent variables are defined: the soil resistance and the interaction properties between soil and reinforced concrete, and two dependent variables: horizontal and vertical displacements are observed in a selected point at the anchorage structure. Results show that the reversed T without retaining wall works in an elastic stage of the soil; hence soil plastic parameters as cohesion and friction angle do not have a significant influence on the final behavior of anchorages. Displacements obtained in a new design with security factor of 12, in compliance with admissible values are included on ANSI/TIA-222-G and CSA codes.