A Study on the Analysis for Welding Residual Stress of Preflex Beam

J. Ocean Eng. Technol. 2003;17(6):65-71.

PREFLEX BEAM 제작시의 용접부 역학적 특성에 관한 연구

방한서,주성민,안해영

조선대학교 항공ㆍ조선공학부,조선대학교 선박해양공학과 대학원,(주)삼현 P.F

Keywords: Preflex Beam, Finite Element Method, Welding Residual Stress, Pre-compressive Stress

핵심용어: 프리플렉스빔, 유한요소법, 용접잔류응력, 초기압축응력

Abstract

Since the preflex beam is fabricated through welding, the pre-compressive stresses that should occur over the concrete pier are diminished by the welding residual stresses. Therefore welding residual stresses must be relieved during the fabrication. Therefore, the analysis and examination of the accurate welding residual stress distribution characteristics are necessary. In this study, accurate distribution of welding residual stress of the preflex beam is analyzed by the finite element method, using 2 dimensional and 3 dimensional elements. Further, the thermo-mechanical behavior of the preflex beam is also studied. After the finite element analysis, real distribution of welding residual stress is measured using the sectioning method, and then is compared with the simulation results. The distribution of welding residual stress by finite analysis agreed well with the experimental results.