Experimental and finite element analysis on performance of high strength grouted sleeve connection
A high strength grouted sleeve connection combined with the 500 MPa rebar and 120 MPa grouting material was proposed to improve the bearing capacity and economy of precast concrete structure.Based on the theoretical analysis of grouted sleeve connection,two sets of 16 mm and 20 mm diameter specimens were designed and studied by the uniaxial loading test,and the failure modes,rebar strain distribution,sleeve axial strain,sleeve transverse strain distribution were obtained by mainly considering the effect of the anchorage length of the reinforcement under unidirectional tension.Then the parametric analysis of high strength grouted sleeve connections was developed by using the verified finite element method.The results indicated that the ideal failure mode of rational design of high strength grouted sleeve connection was rebar necking,and the load-displacement curve mainly contained elastic stage,yield stage,hardening stage and failure stage.The stress and strain and rebar,stress and strain of sleeve,and the damage of grouting material gradually decreased with the increase of anchorage length.In addition,the residual deformation of high strength grouted sleeve connection could satisfy the code requirement while the anchorage length of rebar was not less than 8d,the rebar and sleeve were uniformly stressed,and the damage degree and damage zone of grouting material minimized.
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