Numerical analysis of circular-steel-tube with anchor-plates embedded in concrete-columns under uplift load

Abstract

The concrete columns reinforced by circular steel tube (CRCST) with anchor-plates is the main component of steel tube plug-in foundation, which is widely used in the design of transmission tower foundation with large lateral load. However, the research of the uplift behavior of circular-steel-tube with anchor plates in CRCST is rarely reported. This paper presents the numerical modeling and analysis of circular-steel-tube with anchor-plates embedded in concrete-columns on uplift-load. A finite element (FE) model considering non-linear properties of concrete, strain hardening of steel and non-linear adhesive friction between concrete and steel tube is developed and validated through comparing with the results obtained from the indoor experimental study. Based on the validated FE model, the parameter study is undertaken by analyzing the uplift-load displacement response, stress distribution of a series CRCST models with different thickness and diameter of steel tube, concrete compressive strength, cross-section shape and size of anchor plates, to investigate the effect of geomatic and material properties on the uplift load-carrying capacity of circular-steel-tube with anchor plates in CRCST. A comparison between ultimate uplift resistance obtained from experimental study and calculating method deduced by Japanese standard (JEC-127) and American standard (ASCE/SEI 10-15) is presented. It is demonstrated that the FE model developed predicts the uplift load-carrying capacity well, and the prediction accuracy of Japanese standard is poor, while that of American standard is better.