Research Anchorage Performance Of High Strength Anchor Bolt With Two Different Anchoring Mode

The exposed column foot directly fixes the steel column on the surface of the concrete foundation,which has the advantages of simple structure,quick construction,clear transmission force,and the reinforcement arrangement in foundation was unlimited.The column foot stress is mainly transmitted to the concrete foundation through the anchor bolt connection.Conventional anchor bolts are directly embedded in the concrete structure and the anchorage length of anchor bolts installed the anchor plates,ends or hooks at the bottom,which was greater than 25 times the anchor bolt diameter.At present,the tension anchoring performance of anchor bolts is relatively common in abroad,and the design requirements for anchor bolts are given in the relevant specifications.However,there are few researches about the tension anchor bolts in China,and there is no uniform design standard in standards and standards.In this dissertation,the experimental and finite element method were conducted to study the tension anchoring performance of the anchor bolt joints.Two types of anchoring,embedded and embedded corrugated sleeve poured into grout anchorage were contrasted to study the anchoring performance.Moreover,the anchorage method is compared with the traditional anchorage method to verify the reliability of anchorage method.The main efforts are listed as follows:(1)The pull out tests was carried out to study the bond anchoring properties betweendirect high strength bolts and concrete with forty eight specimens of twenty-four groups.Influence factors of bond anchorage capacity was considered,including the high strengthanchor bolt type,the diameter of high strength anchor bolt d,the anchorage length la andthe thickness of concrete cover c.The test results were compared with relatedspecifications by analyzing the different influence factors,and the formula for calculatingthe anchorage length of the high-strength anchor bolts was proposed,which provided areference for the design and revision of the relevant anchor bolt designs in the country andits application in engineering applications.(2)According to the proposed anchoring method for embedded high-strength anchorbolts with corrugated sleeve,sixty high strength anchor bolt pull out tests,under thirty groups,were carried out.To study the bond anchorage capacity for embedded high strength anchor bolts with corrugated sleeve,the pull out tests was carried out.And the Influence factors of bond anchorage capacity of high strength anchor bolt,including the diameter of high strength anchor bolt d,the diameter of corrugated sleeve D,the anchorage length la,and the diameter ratio D/d were considered.Moreover,the reliability,practicability and superiority for embedded high-strength anchor bolts with corrugated sleeve were verified by analyzing the experimental data,and the recommended anchorage lengths for the reasonable aperture ratio D/d and such high strength bolt anchorage methods are given.(3)Abaqus,a finite element software,was used to model and analyze the different working conditions of the test,and the applicability and rationality of the finite element model is verified by experimental data.