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Deformation of the bridge diaphragm in the perpendicular direction during proof loading: STM in three sections and total station (mm); (a) Load U1: 1 + 2; (b) Load U1: 1 + 2 + 3; (c) Load U1: 1 + 2 + 3 + 4; (d) Load U1: 2 + 3 + 4; (e) Load U1: 3 + 4; and (f) Load U1: 4.
