Method and system for monitoring internal force of leg diagonal member of power transmission tower

The invention provides a method and system for monitoring the internal force of a leg diagonal member of a power transmission tower, and belongs to the technical field of overhead power transmission lines, and the method comprises the steps: taking the grounding positions of a long leg and a short leg of the power transmission tower with the ground as the moment center, and obtaining the force arms of a long leg diagonal member and a short leg diagonal member; acquiring a first wind load at an intersection point position of the main material of the iron tower and a tower body diagonal member and a second wind load at an intersection point position of the main material of the iron tower and a leg diagonal member; based on the first wind load and the second wind load, horizontal force acting on the tower leg partition surface is obtained; based on a force balance principle, diagonal member internal force of a long leg and a short leg of the power transmission tower is obtained, and monitoring of the diagonal me