Method and device for quickly determining optimal buckling cable force of multi-constraint arch bridge during construction period

The invention discloses a method and a device for quickly determining the optimal cable buckling force of a multi-constraint arch bridge in the construction period. The method comprises the following steps of: S1, determining a line shape and stress combined target state of an arch rib in each construction stage; s2, constructing a learning sample, and dividing the learning sample into a training set, a verification set and a test set; s3, building a DNN deep neural network model, carrying out network training, network verification and network testing, and determining the DNN deep neural network model; s4, randomly generating a plurality of groups of buckle cable forces, and screening the buckle cable forces meeting constraint conditions; s5, inputting the cable force of the buckle cable into the determined DNN deep neural network model to obtain a corresponding line shape; and S6, comparing the corresponding line shape with the target line shape Ut, and determining an optimal line shape. The problem that in