Precast beam full life cycle stress monitoring system and method

The invention belongs to the technical field of precast beam monitoring, and particularly relates to a precast beam full life cycle stress monitoring system and method, stress monitoring sensors are arranged inside and outside preset stress monitoring points of a precast beam; a theoretical linear structure of the precast beam is obtained through a precast beam stress theoretical variation generation module, and a finite element model is constructed for simulation analysis to generate a precast beam stress theoretical variation; a linear structure before and after tensioning of a precast beam and stress values of stress monitoring points before and after tensioning are collected through a precast beam stress actual variable quantity generation module, a three-dimensional model is constructed to analyze the stress change state of the precast beam, and the stress actual variable quantity of the precast beam is generated; and comparing the theoretical variation of the stress of the precast beam with the actual v