Experimental Tests and Numerical Analyses on Axial Tensile Bearing Capacity of Connection Specimen of Mechanical Sleeve Embedded in Anti-extubation Pile

Abstract

Purposes To verify the axil fensile beaning performance of pre embeded mechanical sleeve connectors used for anti-pulling pile. Methods The axial tension test of 6 groups of anti-pulling pile tensile mechanical sleeve connectors was completed, and the maximum failure load and failure mode were obtained. Combined with the finite element calculation results, the stress distribution law of the specimen was analyzed to find out the stress concentration point or weak part. Findings The results show that the pre-embedded mechanical sleeve connection specimen meets the requirements of tensile bearing capacity; when the specimen was subjected to ultimate failure, the main failure phenomena were the failure of sleeve groove and steel bar end block; the inclination angle decrease of the contact surface between the pier head and the groove has a significant effect on improving the stress concentration of the specimen, it is suggested that the inclination angle should be controlled within 15°. Conclusion Pile concrete limits the deformation of sleeve connectors and improves the safety and reliability of specimens during pullout.

Keywords

• phc pipe pile
• axial tension
• prestressed reinforcement
• mechanical sleeve
• pile concrete
• finite element simulation