Performance Of Damaged Reinforced Concrete Beams Based On ABAQUS Numerical Simulation Analysis

In actual engineering,the reinforced concrete structure will be damaged due to various environmental conditions.Among them,the damage to the building under the joint action of load and chemical corrosion is particularly prominent.Under the continuous load,the structure may cause cracks and promote the crack development,speeding up the chemical corrosion.In the process of numerical simulation of reinforced concrete beams,the constitutive relationship of concrete is one of the indispensable parameters.Using the experimental values instead of the empirical formulas to calculate the performance of numerically simulated damaged reinforced concrete beams is closer to the actual working conditions.Firstly,the concrete specimens are taken as the research object,and the stress-strain relationship of concrete under different load ratios and different corrosion conditions is studied.The experimental values of concrete stress-strain relationship are fitted by Matlab under the corresponding conditions,and the fitted values are obtained.The simulation parameters were used to simulate the performance of damaged reinforced concrete beams subjected to load and chemical corrosion by ABAQUS software.The results show that within a certain range of sustained load,with the change of age,under the effect of continuous load-sodium chloride solution,continuous loadsodium chloride and sodium sulfate solution,the peak stress and peak strain of concrete are both There is a significant change.The overall trend of both is that the peak stress first increases and then decreases,and the peak strain gradually increases.When the age reaches 120 d and the load ratio is 40%,the comparison with the baseline group under continuous load can be seen.Out,continuous load-sodium chloride solution has more peak stress drop,and the peak strain is slightly shifted to the left.The continuous loadsodium chloride and sodium sulfate mixed solution has less peak stress drop and the peak strain is also slightly to the left.Offset;Matlab is used to fit the stress-strain relationship of concrete under different load ratios and different chemical conditions,and the stressstrain curve of concrete for 180 d is predicted.The predicted values are compared with the experimental values.The curve deviation is not large;the concrete stress-strain under different conditions is analyzed by ABAQUS numerical simulation,simulation and test curve kiss The degree is higher,and the predicted value is used to continue to fit the stress-strain relationship of the concrete with a sustained load ratio of 60% and under different chemical conditions,and substituted into the ABAQUS software to numerically simulate the load-displacement curve and compression zone of the damaged reinforced concrete beam.The stress-strain relationship shows that the experimental values agree well with the simulated values.Figure41;Table24;Reference45...