Experiment on anchoring performance of spiral stirrup-corrugated pipe grout splicing
To provide theoretical data for the spiral stirrup-corrugated pipe grout splicing used in prefabricated structures field,21 anchorage pull-out specimens were designed and fabricated.The failure mode,load-displacement curves and the influence of different influencing factors on the bond anchorage strength of the specimen were analyzed by the pull-out test.The test results show that the failure modes of the specimens include rebar pull-out,splitting pull-out,rebar fracture and splitting fracture.The bond strength decreases with the increase of anchorage length and rebar diameter.The ultimate bond strength varies nonlinearly with the diameter of the corrugated pipe as the diameter increases.The average ultimate bond strength increases with increasing grout strength and the anchorage length can be further reduced to 5d.In engineering applications,when the rebar diameter is no more than 16 mm,the anchorage length is recommended to be 5d to 7d and the corrugated pipe diameter to be 2.5 to 2.8,and when the grout strength fcu≥80 MPa,the anchorage length is not less than 5d.
万方数据
维普
