Application of response surface-based finite element model in structural damage identification of concrete beams

The emergence of finite element model modification techniques has made it possible to use numerical theoretical analysis techniques to achieve the assessment of the bearing capacity of two problems in practical engineering. Therefore, an improved scheme of finite element model based on the response surface method is proposed, which is optimized by GA algorithm and verified. The experimental results show that the mid-span deformation and strain of the beam under static load are below 5%. Under different static responses, the deformation amplitude is within the set range of concrete structure failure, and has high sensitivity. The precision of response surface equation under different static responses is above 0.99, the highest is 0.9996, which shows the good fitting accuracy of the model. The calculated results of the two optimal methods are in good agreement with the measured results, and the deviation comparison values are within 10%, the lowest is 1.1%. It can identify the concentrated parts of the concrete beam, which is basically consistent with the actual results. In summary, the improved finite element model of response surface can be used to better judge the stress status of concrete beams. Through optimization such as genetic algorithms, the damage identification rate of structures can be effectively improved, which is of great significance in practical engineering applications.