부식손상된 강재의 피로강도 평가에 관한 실험적 연구 = An Experimental Study on Fatigue Life Evaluation of Corroded Steel

국문 초록 (Abstract)

본 연구에서는 부식손상된 강부재의 피로강도 평가법에 대해 실험적으로 검토하였다. 실제 대기환경에서 7년간 노출되어부식손상된 가시설 주형보와 75년간 해상환경에서 공용된 강교량에서 절취한 시편을 각각 22개와 9개 제작하여 부식표면형상을측정하고 고속푸리에변환 분석을 통해 응력집중계수를 계산하여 피로실험을 실시하였다. 그 결과, 부식표면형상 측정으로 산출한부식두께비로 부식등급을 분류하고, 최소단면과 피로파단의 그 관계에 대해 분석하였으며, 부식등급에 따른 피로균열 진전거동 및응력집중계수를 검토하였다. 그리고 평균두께, 최소두께, 최소평균두께 및 유효두께에 근거하여 피로등급을 평가하고, 최종적으로부식손상된 강재의 피로강도 평가법을 제안하였다.

다국어 초록 (Multilingual Abstract)

This study aims to evaluate and predict the fatigue strength of steel members in bridge structures, focusing on the corrosion damages. To evaluate the fatigue strength of corroded steel, corroded members were cut from the temporary steel structures and steel bridge exposed in long-term atmospheric environment, and fatigue tests were conducted after measuring the surface profile and calculated stress concentration factor through fast Fourier transform. Based on corrosion levels clas sified from the corrosion thickness ratio, analyzed the relationship between minimum cross section area and fatigue crack point, fatigue strength of the corroded steel were evaluated.

참고문헌 (Reference)

• 1 문재민 ; 정영수 ; 전제형 ; 안진희 ; 김인태, "대기환경하에서 장기간 사용된 부식강재의 실험적 피로거동평가" 한국강구조학회 29 (29): 193-204, 2017
• 2 이명진 ; 안진희 ; 김인태, "국부 부식손상에 의하여 비대칭 전단저항 복부단면을 가진 강거더의 전단강도 및 거동평가" 한국강구조학회 26 (26): 105-118, 2014
• 3 김인태 ; 장홍주 ; 정지영, "가시설 부식 강재의 잔존 인장 내하성능 평가에 관한 실험적 연구" 한국강구조학회 22 (22): 399-409, 2010
• 4 Ministry of Land, Infrastructure and Transport, "Yearbook of Road Bridge and Tunnel Statistics" 2022
• 5 Korea Facilities Safety Corporation, "Study on the Maintence and Reinforcement Method (Draft) of Facilities Including Bridges and Tunnels"
• 6 Masaki, K., "Small Crack Property of Austenitic Stainless Steel with Artificial Corrosion Pit in Long Life Regime of Fatigue" Elsevier 28 (28): 1603-1610, 2006
• 7 M. Ohga ; J.M.R.S. Appuhamy ; K. Fujii, "Prediction of Residual Strength of Corroded Tensile Steel Plates" 한국강구조학회 11 (11): 65-79, 2011
• 8 Ministry of Land, Transport and Maritime Affairs, "Highway Bridge Design Standard (Limit State Design)"
• 9 Rusk, D. T., "Fatigue Life Prediction of Corrosion-Damaged High-Strength Steel Using an Equivalent Stress Riser (ESR) Model, Part II: Model Development and Results" Elsevier 31 (31): 1464-1475, 2009
• 10 Kainuma, S., "Fatigue Behavior of Corroded Structural Steel Members in Boundary with Concrete" Trans Tech Publications 348-349 : 245-248, 2007
• 11 Xu, S. -H., "Estimating the Effects of Corrosion Pits on the Fatigue Life of Steel Plate Based on the 3D Profile" Elsevier 72 : 27-41, 2015
• 12 Kim, I. -T., "Effect of Corrosion on the Tension Behavior of Painted Structural Steel Members" Elsevier 133 : 256-268, 2017
• 13 Perkins, K. M., "Corrosion Fatigue of a 12%Cr Low Pressure Turbine Blade Steel in Simulated Service Environments" Elsevier 27 : 1499-1508, 2005
• 14 Bhuiyan, S., "Corrosion Fatigue Behavior of Extruded Magnesium Alloy AZ61 Under Three Different Corrosive Environments" Elsevier 30 : 1756-1765, 2008
• 15 Kim, H. -S., "A Simple Approach for Evaluating the Stress Concentration Factor of a Corroded Surface Using the Fast Fourier Transform" Elsevier 115 : 104612-, 2020