Study on mechanical properties of new grouting sleeve under different parameters
In order to study the influence of the number of ring ribs,the spacing of ring ribs,the depth of ring ribs,the anchorage length of steel bars and the diameter of steel bars on the mechanical properties of the new grouting sleeve made of seamless steel tubes,23 groups of 69 full-grouting sleeve connection specimens with Q390B low-alloy seamless steel tubes as raw materials were designed and manufactured for uniaxial tensile test.In addition,ABAQUS was used for numerical simulation,and the numerical analysis results were compared with the experimental values to analyze the influence of the above parameters on the bearing capacity,failure mode and stress distribution of the sleeve specimens.The results show that the numerical analysis results are in good agreement with the experimental values,which fully verifies the feasibility of the numerical model analysis.The ring rib of the sleeve should not be set near the elastic section of the steel bar and the central position of the sleeve.The increase of the number of ring ribs in a certain range is beneficial to improve the bearing capacity of the sleeve.The too large and too small ring rib spacing and ring rib depth are not conducive to improving the bearing capacity of the sleeve,and the stress concentration phenomenon is obvious.The anchorage length should not be less than 6 times the diameter of the steel bar to meet the bearing capacity requirements of the sleeve,and the difference between the inner diameter of the sleeve and the diameter of the steel bar should not be less than 12mm.
NETL
NSTL
万方数据
