Bond-slip Constitutive Model Research Articles

Refining bond–slip constitutive relationship between checkered steel tube and concrete

In view of the problem of low average bond strength between steel tube and concrete, nine push-out test specimens of concrete filled checkered steel tube (CFCST) have been done to investigate the bond performance between checked steel tube and concrete. According to the experimental results of bond–slip curves, a basic bond–slip constitutive model is established. Considering the varying influential parameters of height of checkered pattern and concrete strength, the changing trends of the ultimate average bond strength are analyzed. Meanwhile, the distribution regularities of checkered steel tube strains, bond strengths and slippages along the longitudinal length, and bond–slip curves in different longitudinal positions are obtained. Based on the basic bond–slip constitutive model, two position functions are introduced to establish the bond–slip constitutive relationship. The experimental results show that the height of checkered pattern has a significant influence on ultimate average bond strength and that the basic bond–slip constitutive model matches well with our test curves. The introduction of the position functions laid the foundation for further finite element analysis of CFCST.

Study on Bond-Slip Performance of Corroded Reinforced Concrete Members

According to pull-off test on reinforced concrete specimens with different corrosion rate, their failure patterns, relationship between bonding strength and slippage, variation laws of bonding strength and slippage are studied. The calculating formula of reduction coefficient of bonding strength and slip ratio is proposed. Based on these studies, constitutive model of bond-slip performance for corroded reinforced concrete is set up. It can be seen after verification and analysis that calculated results of this model agree well with trial values, which suggests that the bond-slip constitutive model of this paper is reliable and universal.

Research of Bond-Slip Constitutive Relation Model between Fiber Gypsum Board and Concrete Materials

How to establish the bond-slip constitutive relation model of concrete and gypsum board will be of great academic significance. Through the pull-out experiment of CFFP, the load-slip curves is obtained. The characteristics and research situation of bond-slip performance at the inter face of concrete and other materials are introduced, and the bond-slip constitutive relation models are summarized at the same time. By using the fitting operation, the proposed constitutive relation is put forward , which is feasible and can be applied to further research on CFFP.