Modified steel bar model incorporating bond-slip effects for embedded element method

作者：Dehestani M^*; Mousavi S S

来源：Construction and Building Materials, 2015, 81: 284-290.

DOI：10.1016/j.conbuildmat.2015.02.027

• Steel bar
• Embedded element
• Bond-slip effect
• Effective bond strain
• Transmission length

The interaction between the steel bar and concrete is one of the most important issues that control the efficiency of the composite behavior. Accurate evaluation of the interaction between the reinforcement and the surrounding concrete can lead to more reliable finite element models. The implementation of a modified steel bar model in embedded elements to consider the bond-slip phenomenon is presented in this study. The procedure includes the addition of equivalent bond strain to the strain of the steel bar. This leads to a decrease in the effective stiffness of steel bar in the layered model. Validation of the modified steel bar model with existing experimental results demonstrates that the model is capable to consider the bond effects in embedded elements for use in analysis of reinforced concrete structure. A comprehensive parametric study is accomplished to obtain the influence of parameters such as concrete and steel properties, bar diameter, reinforcement ratio and confinement conditions on modification factors. Results revealed the significant effect of bond-slip on total behavior of the member.

• 出版日期2015-4-15