Bridge erecting machine girder section optimization method based on double-strategy evolutionary fruit fly algorithm

The invention belongs to the technical field of construction design, and particularly relates to a bridge girder erection machine girder section optimization method based on a double-strategy evolutionary fruit fly algorithm. Comprising the following steps: step 1, determining a target function and corresponding to-be-optimized key parameters by taking the cross section area of a main beam as an optimization target; step 2, performing optimization design on each key parameter through a double-strategy fruit fly optimization algorithm of chaotic mapping, dividing a population into two parts by the double-strategy fruit fly optimization algorithm of chaotic mapping, and performing position optimization on the fruit fly population by adopting two methods, one is a self-adaptive chaotic algorithm, and the other is an original basic fruit fly algorithm; and 3, according to the optimization result of the key parameters, checking and calculating the strength and rigidity of the main beam structure. According to the