Research on the mechanical properties and cohesive zone model of the steel-ECO concrete interface
In recent years,ecology conservation optimization concrete(ECO concrete)has gained favor in steel bridge deck paving projects due to its excellent properties.However,there has been limited investigation into the mechanical properties of the interface between ECO concrete and steel plates,thus constraining its further widespread application.To study the mechanical properties of the steel-ECO concrete interface,three specimens of steel-ECO concrete interface were designed and fabricated for four-point bending test.The experimental results demonstrate that,compared to ordinary steel-concrete interface,the bond strength,stiffness,and ultimate opening displacement of the steel-ECO concrete interface have been increased by 289.3%,368.4%,and 160.0%,respectively,indicating better mechanical properties.Additionally,to accurately describe the normal cracking behavior of the steel-ECO concrete interface,a cohesive zone model suitable for normal cracking of this interface was proposed,and the parameter values of the model were determined based on regression analysis of experimental data and fracture boundary conditions.The research results indicate that the proposed cohesive zone model can accurately characterize the initiation and development process of normal cracking damage at the steel-ECO concrete interface,and can conveniently calculate the bond strength,stiffness,critical displacement at the onset of damage,and critical fracture energy of the steel-ECO concrete interface.Furthermore,compared with the exponential model,the mean square error of the raised model applied to the descending section of each specimen is reduced by 57.3%,46.0%,and 72.9%,significantly enhancing the accuracy of the cohesive zone model.Moreover,the findings can provide theoretical basis for the practical engineering application of ECO concrete,further promoting its widespread utilization in the civil engineering field.
steel bridge deckECO concreteinterface mechanical performancefour-point bending testcohesive zone model
万方数据
维普
