In this paper, a nonlinear planning method, quasi Newton multiplier method, is introduced for the optimization of the bracing stiffness in braced frame structures with symmetric bracings.

An optimization model to find the lowest budget schedule of network planning is established under the assumption that the time-cost relationship is nonlinear.

Gathering network planning is highly nonlinear, so how to optimize gathering network and build the model to improve its economic benefit are of great significance.