Experimental Study On Bonding-anchoring Behavior Of Steel Bar In Grouted Joint Of Self-insulation Concrete Compound Block Masonry

Experimental research and theoretical calculation of the bond anchorage performance of steel bar in self-insulation concrete composite block masonry are carried on in this paper. Through the analysis of experimental research, put forward the design suggestions of anchorage length of steel bar in grouted joint of self-insulation block masonry.Through the pull-out test of 36 steel bars in the self-insulation concrete compound block masonry, the bond failure form of steel bar in horizontal gray seam is obtained. The effects of vertical normal stress, anchorage length of steel bar and mortar strength on the bond behavior of steel bar are studied; The limit anchorage length of the reinforced bar in the self-insulation block is obtained from the analysis of bond stress along with the change of the distribution of anchorage length of steel bar.The analysis of the impact of mortar strength grade, steel bar diameter and anchorage length on the bond performance is carried on by the pull-out test of 39 steel bars in self-insulation concrete compound block Calculation formula of ultimate bond strength of steel bar and block special mortar block mortar is obtained.The bond anchorage performance of steel bar in the horizontal joint of the self-insulation block is calculated and analyzed based on the finite element software, and the calculated result is in good agreement with the experimental result.Hasofer-Lind first order two moment method is used to carried on the reliability calculation of bond anchorage limit state. The design of anchorage length of steel bar in self-insulation block is proposed. In the self-insulation block masonry, the anchorage length of reinforcement should not be less than 70 times the diameter, and the length of the horizontal bending section should not be less than 20 times the diameter.