MESURING METHOD FOR DEFORMATION OF BRIDGE

PURPOSE: A method of measuring the deformation of a bridge is provided to enable the 3D deformation of a bridge to be measured by the simplification of a structure. CONSTITUTION: A method of measuring the deformation of a bridge is as follows. A target point is established on one side of the bridge(S1). First and second cameras, which are arranged at an interval, take pictures of the target point, simultaneously. An external look element is established using a mutual look technique of a coplanarity condition(S2). The 3D coordinate of the target point is calculated using a collinearity condition, which comprises an internal look element and the external look element. Picture survey is performed through the first and second cameras when a train enters the bridge(S3). The 3D coordinate of the target point is re-measured using the collinearity condition. The deformation of the 3D coordinate of the target point is calculated(S4).