Contemporary conceptual models for predicting carrying capacity of multi helices screw piles

Abstract. Contemporary civil constructions are based on foundation systems consisting mainly of shallow, semi deep and foundations. The screw pile resembles essentially to a large that is inserted into the ground by special machine. Basically, it acts as or an anchor. In general, composed central shaft one more graded steel helices. Screw piles have made great progress in recent decades, particularly when comes their axial capabilities installation processes. Using for anchoring supporting structures advancing rapidly. Despite this, still lacking design methods require further research. This study consists developing three conceptual models predict carrying capacity multi first analytical model takes account friction, grooves’ geometry, configuration helices’ assembly. second observed failure surface proclaimed literature. Whereas, third empirical considers existing correlation between torsional resistance generated during its capacity. were validated against some actual testing results experimental data reported It was noted underestimate compressive about 5 15%. For model, reasonable agreement calculated measured ratio L/B ≥ 10. However, opposite, overestimates ultimate 15.3%. Likewise, (third model) tensile 10 20% with average 12.4%.