500MPa级钢筋套筒灌浆连接力学性能研究OA

Sleeve grouting connection technology is one of the main connection methods in the prefabricated concrete structures,which is devel-oping towards to the high-strength steel bars.In this paper,four grouted sleeve connections with different rebar strengths,anchorage lengths,and grout material strengths are designed and analyzed which are based on 500 MPa grade rebars,so the failure modes and load-displacement curves of the specimens can be obtained.The results show that increasing the grout strength can reduce the internal concrete cracks and en-hance the adhesion force between the rebar and grouting material.The mechanical interlocking of the rebar and steel grouting material can be also improved by increasing the anchorage length of rebar from 6 d to 8 d,while the residual deformation of the sleeve grouting connection will be effectively decreased.In addition,the 120 MPa grouting materials and anchorage length of 8 d are recommended to use in the 500 MPa re-bar grouted sleeve connection.