Journal of Materials and Engineering Structures
Volume 12, Numéro 3, Pages 295-314
2025-09-30
Strengthening Of Deficient Drop-in-ends With Near Surface Mounted (nsm) Steel Bars Under Static And Repeated Loading
Authors : Shakir Qasim M. . Alliwe Ruqyia .
Abstract
The present research work, presented the results of eight drop-in-ends specimens tested experimentally to investigate the efficiency of the NSM steel bars technique in strengthening the drop-in-ends including internal miss detailing, under static and repeated loading. Two values of shear span/depth (a/d) ratios was considered, namely are 1.0 and 1.5. Several variables were considered including (a/d) ratio, effect of deficient nib reinforcement (by about 40%) and the type of loading. The behaviour has been discussed in terms of cracking load, failure load, cracking pattern, load-deflection curve and failure mode. Results revealed that increasing a/d ratio from 1.0 to 1.5 yielded a reduction in capacity and the corresponding deflection by 33% and 5%.Moreover, capacity reduced by 11% and 5% for the two values of a/d respectively, when the nib steel reduced by (40%).Furthermore, it was found that the strengthening by NSM steel bars resulted in increasing capacity by 15% and 14% for the two a/d ratio respectively. Regarding the repeated loading tests, it was found that capacity and corresponding deflection reduced by 25% and 42% for a/d =1.0 relative to the strengthened specimen and tested under static loading ,while the respective values for a/d =1.5 were 5% and 3%. In addition, it was obtained that the capacity was reduced by 16% when increasing a/d ratio from 1.0 to 1.5.
Keywords
Drop-in -ends ; Repeated loading ; Residual deflection ; NSM steel bars
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