ANCHORAGE OF RIBBED BARS IN HIGH STRENGTH CONCRETE BEAMS

摘要

With the aim to study the bond behaviour and the anchorage capacity of ribbed bars in high-strength concrete, an extensive experimental study was carried out. For each test in high-strength concrete, a companion test in normal strength concrete, with the same detailing, was prepared as a reference. Non-linear FE-analysis was used as a tool to better understand and explain the observations made. Various types of test specimens were used but this paper only concerns anchorage at end supports. As expected the anchorage capacity in the high-strength concrete was considerably higher than in normal strength concrete. Still, it was found that high-strength concrete had a limited ability for favourable stress re-distribution compared to normal strength concrete, both along the anchorage length, and between bars anchored in the same anchorage region.