Reliability analysis for anchorage of reinforced concrete beams with longitudinal cracks due to corrosion at anchorage zone

摘要

An anchorage reliability analysis approach for simply supported reinforced concrete beams under corrosion attack in the anchorage zone is developed. The first-order second-moment method is employed to analyze the effects of various factors on the anchorage reliability. These factors include both the length and width of cover cracking due to reinforcement corrosion, the cover thickness, the anchorage length, and the stirrup ratio. The results show that the effect of corrosion-induced crack length on the reliability index for anchorage, beta_0, is negligible when the crack on the concrete surface is just appearing, but with the crack widening, the beta_0 value is reduced significantly; the considerable changes in /30 result from a variation in cover depth and anchorage length; the effect of changes in the diameter or space of stirrups on the anchorage resistance is very limited, and the variation in beta_0 is also very low.