Reinforced Straight Thread Sleeve Connection Of The Mechanical Behavior Of Its Application

There have been a series of rebar couplers from the last century 70's when the rebar mechanical splicing were invented. The rebar couplers include sleeve extrusion couplers cone screw thread couplers parallel thread rebar splicing with upsetting ends parallel thread rebar splicing with rolled thread ends and so on, among which the mechanical character of the parallel thread rebar splicing with rolled thread ends is better than any other's. And the parallel thread rebar splicing with rolled thread ends are popular to big diameter rebar splicing today.A lot of work have been done in this paper on the parallel thread rebar splicing, which include theorees analysis for mechanical behavior test finite element analysis and so on. The purpose is to study the rebar couplers deeply, which would help to the rebar couplers applied to the actual projects.According to JGJ107, there have tested a series of rebar couplers for III class reinforcing bar on testing machines. Single direction tension and the repeating of tension and compression in elastic and pastic range tests have been done. The results show that the samples' connection character for rebar couplers measuree up JGJ107, among which the connection character of parallel thread rebar splice with rolled thread ends is better than any others'.There have done lots of work on analysis the parallel thread rebar splice with rolled ends for its merits. First, we simulate the rebar couplers in finite element method. The results are accordant with test results. Second, the paper concluded some recommendatory design parameters according to above nanlysis, which help to this type rebar couplers applied to actual projects.