Theoretical analysis on bond characteristics between steel bars and ultra-high performance concrete

In order to investigate the bond and anchorage characteristics of steel bars embedded in Ultra-High Performance Concrete (UHPC), Tepfer thick-walled cylinder theory and elastic mechanics theory were used to establish the theoretical calculation model of bond strength between deformed steel bars and UHPC under the conditions of splitting failure and pull-out failure, respectively. Then the proposed calculation model is verified with a large number of test data from the literature and experiments conducted by the author. Finally, the anchorage length of deformed steel bars in UHPC is calculated by Central Point method, Checking Point method and the design specification of normal concrete structure, and the recommended values of anchorage length are given based on anchorage reliability theory. The research results can provide design basis for engineering designers, and are also a useful guideline for the popularization and application of UHPC materials.