چكيده به لاتين
The slip between concrete and rebars, is one of the most important factors in behavior of reinforced concrete structures. Not considering the slip effect, may lead to increasing the stiffness, and decreasing the energy absorbing. The slip typically occure in the cracked part of the reinforced concrete structures such as tensile members, column-foundation connections, column-beam connections, and in cold cracks. In finite element analysis of such structures, the slip event can be simulated approximately by implementing a proper sticky-slip relation.
Many researchers have presented bond-slip equations for interaction of concrete-rebars, that in these equations, bond is a function of slip between them. Also there are many researches in this field, but a general relation for all reinforced concrete structures with good accuracy is not presented.
In this thesis, by using ABAQUS finite element software, the pull-out tests were analysed with several bond-slip relations. According to analysis results, a bond-slip relation which is related to steel strain is presented. Also a new and simple method is proposed to implement bond-slip relation in reinforced concrete structures. Due to validate, the results of the presented model is compared with the results of other models and test results. Finally by using these relations, a progressive collapse of a reinforced concrete structure is modeled. The results show good accuracy with the test results.
Keywords: bond-slip, concrete-rebar interaction, reinforced concrete structures analysis, abaqus, finite element
