Damage Detection in Jacket-Type Offshore Structures From Few Mode Shapes

J. Ocean Eng. Technol. 1994;8(1):144-153.

Kim Jeng-Tae,Stubbs Norris

Postdoctoral Research Associate Department of Civil Engineering Texas AandM University College Station TX 77843 USA,Postdoctoral Research Associate Department of Civil Engineering Texas AandM University College Station TX 77843 USA,Dept of Civil E

소수의 모드형상을 이용한 자켓형 해양구조물의 손상추정에 대한 연구

김정태

Keywords: Dynameic Responses, Modal Analysis, Damage Detection, Nondestructive, Sensitivity Analysis, Offshore Jacket Structures

Abstract

An algorithm to locate and estimate severity of damage in jacket-type offshore structures for which modal responses are availabit' for very few vibrational modes is presented. First, a theory of damage locaization and severity estimation(which yields information on the location and severity of damage directly from changes in mode shapes) is formulated. Next, the feasibility the damage detection algorithm is demonstrated by using a numerical example of an offshore jacket platform for which only three vibration modes are measured. Form the material presented here, two major results are observed. First, all damage locations in the offshore jacket platform are correctly predicted. Next, predicted damage is relatively correctly estimated.