Experimental Study On Mechanical Properties Of Grouting Sleeve Connection

The development of construction industry is closely relevant to social progress.As China shift to the green and low-carbon development path after a rapid developing period,prefabricated concrete structures began to be widely used.The mainly connection mode of stressed steel in this structure is sleeve grouting connection which determines the seismic stability of the structure.This paper launches studying according to two levels as material and mechanical properties.At first,designing an orthogonal experiment to explore the suitable formula of grouting material;Then,studying the bond-slip behavior of grouted-filled pipe splice by pull-out test.The main work and achievements of this article are as follows:(1)Introducing the research status of grouting material configuration method and mechanical properties of grouted-filled pipe splice by summarize the relevant literature.The research direction and analysis thought of this paper were determiner on that basis.(2)Prepared grouting material with ordinary Portland cement,sand and several admixtures,using variance and range analysis to assess the influence of each ingredient on liquidity and strength,to find the most appropriate program.(3)Designed and made 18 grouted-filled pipe splice specimens by changing thickness of the pipe wall and anchorage length,studied their bond-slip property by conductiong pull-out test.Has advanced the bond-slip constitutive relations of grouted-filled pipe splice,prorosed an equation which considered the constraint effect of the sleeve pipe to calculate the bond strength.(4)The model of grouted-filled pipe splice specimens was set up using finite element analysis program-ABAQUS.According to compared the consequences of the simulation and test,has proved that model is effective and reliable.Then,analysising the influence of the size of sleeve pipe and the thickness of the grout on the mechanical properties of the grouted-filled pipe splice.