Suspension bridge cable force optimization method

The invention relates to a suspension bridge cable force optimization method. The method comprises the following steps: firstly, establishing an overall analysis model of a suspension bridge by using finite element analysis software, and verifying the accuracy of model bridge forming; then, in a calculation model diagram, a suspender is cut off, a main beam is divided into discrete units, and a target function is established with displacement linear control of the main beam and a main cable as an optimization solution target; symmetrical tensioning is adopted for the whole bridge, and suspender tensioning is sequentially conducted from the midspan to the two ends. And a relational expression is established between the displacement state of the previous tensioning and the displacement state of the current suspender during tensioning each time. And establishing an index function by applying a dynamic planning method, and substituting the objective function and the relational expression established during tensio