Experimental Research on Beam Bar Bond Deterioration of the Interior Joint in Earthquake-resistant Frames
FU Jian-ping, LIU Xiao, BAI Shao-liang
DOI:10.11835/j.issn.1674-4764.2007.04.010
Received ,Revised February 15, 2007, Accepted , Available online July 01, 2015
Volume ,2007,Pages 39-43
- Abstract
Based on the reversed cyclic loading tests of 21 nearly full-size interior joints in completed reinforced concrete frames,the law of bond deterioration of beam bars crossing the joint is tested and analyzed,which is influenced by the axial load ratio,shear-compression ratio,reinforced bar strength,concrete strength and the relative length of beam bars crossing the joint. By the nonlinear fitting method, the formula of the bond stress r between steel crossing interior joints and concrete under different loading step is obtained. According to the loading approach, the propositional formula of the relative length of beam bars crossing the joint hc/d is presented, which is influenced by axial load ratio, shear-compression ratio ,reinforced bar strength and concrete strength.