Structural assessment aided by low level response measurements

Abstract

The acquisition of low-level response measurements on large civil structures has been aided in recent years by significant advances in instrument and computer technologies. Measurement techniques applied to structures like dams and bridges have traditionally focused on known, measurable excitation forces (e.g., forced vibration) applied directly to the structure. An alternative way of thinking about the conduct of testing large structures is presented in which very low-level response measurements are used to evaluate dynamic characteristics, to evaluate system characteristics, and to evaluate changes in structural health or damage detection. Samples of actual field experiences are discussed and the ongoing development of a national database for large civil structural response characteristics is presented.