Abstract: An algorithm originally used to locate errors in finiteelement models is applied to a full scale bridge damagedetection experiment. The method requires experimentalfrequency response function data measured at discretelocations along the major bridge load paths. In thebridge damage application the algorithm is mosteffective when applied to static flexibility shapesestimated with a truncated set of six mode shapesrather than individual mode shapes. The algorithmcompares `before damage' and `after damage' data tolocate physical areas where significant stiffnesschanges have occurred. A damage indicator shows whetherdamage is detectable. Damage is correctly located inthe two most significant damage cases using the drivingpoint static flexibility estimates. Limitations of thetechnique are addressed. The damage detectionexperiment was performed on a three span steel girderbridge that was 425 feet long. This bridge was part ofInterstate 40 across the Rio Grande. The New MexicoState University Department of Civil Engineeringorganized the experiment. The frequency responsefunctions were collected by Los Alamos NationalLaboratories personnel. The bridge excitation wasprovided by Sandia National Laboratories. !6
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