DIRECT IDENTIFICATION OF DAMAGE IN BEAM STRUCTURES USING DEAD LOAD MEASUREMENTS

Abstract eng:
Changes in local flexibility caused by damage in a structure will case the internal forces of the structure to redistribute. A method for damage detection in beam structures is proposed that is based on measuring the change in redundant forces in the system due to dead load. Damage is modeled as a hinge plus a rotational spring that connects two sub-domains of a beam. By solving a nonlinear least squares problem, the damage location and severity can be obtained. Two example problems are presented, first, a single-span beam with partial restraint at each end, and second, a two-span continuous beam that is fixed at each end. Early laboratory tests conducted on a 10-foot aluminum beam show promising results.

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