Bridge lower structure performance evaluation method and system

The invention relates to the field of bridge engineering, in particular to a bridge substructure performance evaluation method and system. The bridge substructure performance evaluation method provided by the invention comprises the following steps: analyzing stress conditions of a bridge substructure, wherein the stress conditions comprise flowing water pressure, hydrostatic pressure, water lifting force, floating object impact force, overlying soil gravity, side soil pressure, structure permanent acting force and base friction force; evaluating danger scales of the bridge substructure according to the stress condition, wherein the danger scales comprise an overturning danger scale, a slippage danger scale, a differential settlement danger scale and a comprehensive danger scale; and evaluating the risk degree of the bridge substructure based on the danger scale, wherein the risk degree comprises a low risk degree, a medium risk degree and a high risk degree. According to the method, the multi-aspect danger s