EXPERIMENTAL STUDY OF ANCHORAGE PERFORMANCE OF GROUTING CONNECTION WITH STEEL BARS INSERTED PRE-BURIED BELLOWS

In order to study the assembling and connection reliability of pre-cast concrete structural components，a grouting connection was proposed with the steel bars inserted pre-buried bellows． Considering of the bar diameter， sleeve diameter，anchorage length，and so on，48 pull out tests of 16 groups were carried out under the continuous load． The results showed that there were two sorts of final failures in the specimens，namely the bond slip failure and reinforced tension yield or being broken，that there was no non-production bond slip failure． It also showed that the connection mode could be applied to assembly and connect pre-cast concrete structures with the reliable anchoring performance，simple construction operation and high efficiency of molding． In this paper，it was proposed that the anchor length of grouting connection should be 15 times of the steel bars diameter and the outer diameter of pre-buried bellows should be 2 times of the steel bars diameter．