SIMULATION VERIFICATION ANALYSIS OF ANCHORING CHARACTERISTICS OF TRANSVERSE RIB STEEL BAR DURING PULL-OUT TEST

Abstract

To evaluate the anchoring mechanical characteristics of transverse rib steel bar during the pull-out test, the comprehensive methods such as laboratory test, numerical simulation and theoretical analysis were conducted. The results show that the anchorage grout during the pull-out tests display the splitting failure mode and the relationship curve of anchorage force-displacement can be simplified into four stages: debonding stage, ascent stage, splitting stage, and residual stage. Then the analytical derivation and segregate expressions to the relationship curve of anchorage force-displacement at different stages were carried out by using the nested cylinder model. Furthermore, the numerical simulation results verified that the grout in front of the transverse rib presented the wedge-shape force and the anchorage grout displayed the splitting failure mode ultimately. It was found that the anchorage force and the remained grout in front of the transverse rib increase with the transverse rib height increasing during the pull-out tests. The results can provide a basic reference for the reinforcement design and safety construction of practice engineering. Keywords: Pull-out test, Transverse rib bar, Nested cylinder model, Numerical simulation