Abstract
Fifteen lap splice specimens reinforced with plain steel bars were tested under four-point loading to investigate bond resistance as a function of development length and bar diameter. Three of these specimens were instrumented with both steel and concrete strain gages to examine bond loss within the lap splice length. All of the specimens failed in bond. Splice specimens reinforced with plain bars are capable of resisting maximum loads that are approximately 60% of those recorded for two similar specimens that were reinforced with deformed bars. An analysis of 11 of the splice specimens tested shows that CEB-FIP Model Code provisions for average bond stress underestimates the prediction of the maximum load by 16% on average. A flexural analysis conducted for the instrumented specimens showed that strain compatibility did not exist for much of the loading range.
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