The Earthquake Engineering Online Archive

Effects of concrete types and loading conditions on local bond-slip relationships

Cowell, Andrew D.; Popov, Egor P.; Bertero, Vitelmo V.

UCB/EERC-82/17, Earthquake Engineering Research Center, University of California, Berkeley, 1982-09-01, 72 pages (515/C68/1982)

This report describes one phase of an experimental investigation into the anchorage bond of deformed reinforcing bars in well confined concrete. The experimental specimens approximate the condition of a continuous main longitudinal beam bar embedded in a beam-column joint. Emphasis is placed on determining local bond-stress and slip for a #8 reinforcing bar. A total of seven specimens are reported upon. Results of experiments using normal weight concrete are compared with similar experiments on specimens constructed of lightweight aggregate concrete and high-strength concrete. Comparison reveals a poorer performance for lightweight specimens, especially when subjected to cyclic loading. High-strength concrete demonstrates an increase in both maximum strength and stiffness of the bond-slip relationship. An additional normal weight test investigates the effect of applying load to one end as opposed to both exposed ends of the test bar. Results indicate that the support reactions induced in the test specimen do not adversely influence the bond-slip behavior of the test bar. Further insight into the nature of the bond mechanism and its variation over the embedment length are also gained from the test.

Available online: http://nisee.berkeley.edu/documents/EERC/EERC-82-17.pdf (5 MB)