The Fine View Damage of Reinforced Concrete Piles Under the Combined Effect of Temperature and Load
In order to explore the influence of different environmental factors on the deterioration of wharf pile material properties and reduce the bearing capacity of the pile body,a three-dimensional particle flow discrete element reinforced concrete pile model was established through PFC3D(particle flow code 3D)for research.A temperature stress model was established,and thermal parameters were selected to construct a temperature heat pipe model.Through graded heating,the transverse tensile strain,longitudinal compressive strain,and microcrack growth number of reinforced concrete piles were obtained as a function of temperature.Adjust the proportion and strength grade of coarse aggregate in the model concrete,and study its impact on the thermal damage of reinforced concrete piles.The stress-strain curve obtained by applying a temperature field model to a horizontal load.Based on the number of microcracks in the model,a damage variable axial strain curve was constructed to further analyze the damage law under the combined action of temperature and load.The results show that the axial compressive strain and transverse tensile strain of concrete gradually increase with the increase of temperature,and the number of micro cracks increases with the increase of temperature.An increase in the proportion of coarse aggregate will increase the initial damage caused by heating.The increase in temperature results in varying degrees of decrease in the macroscopic mechanical properties of the material.
万方数据
维普
