Tender For corrigendum : three consecutive days of field instrumentation and structural assessment to measure vibration of bridge superstructure using triaxial accelerometer, liner displacement at expansion joint location through lvdt, deflection measurement at mid-span through laser sensor, and preparation of structural adequacy report based on field results and structural analysis (through 3d fea modelling analysis in midas/sofistik) / span basis for an existing river / rail over bridge in valsad district.