Abstract
To study the bond anchorage performance of 1860-grade high-strength prestressed steel strands and lightweight aggregate concrete, taking the cover thickness, anchorage length, stirrup spacing and matrix material as characteristic parameters, 10 groups of three specimens – a total of 30 test specimens – were designed and manufactured for pull-out tests. In these tests, the failure modes and the variation of bond strength of specimens were examined, and the influence of the variation of characteristic parameters on the bond anchorage performance of 1860-grade high-strength steel strand and lightweight aggregate concrete was studied. Optimal results were produced with a larger cover thickness and anchorage length, and smaller stirrup spacing. Based on the experimental data, we established the formula of ultimate bond strength and the formula of bond strength when the average slip is 1 mm, and a recommended formula for the anchorage length of components was devised incorporating current building design codes.
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