CAJ | 학술논문

根据6根模拟试验梁的疲劳试验结果,分析了钢筋严重锈蚀、黏结力基本丧失后钢筋混凝土梁的破坏形态、刚度及疲劳寿命退化.指出局部无黏结梁中钢筋的疲劳断裂位置都处有无黏结的分界面上;试验梁的刚度随跨中完全无黏结区段长度的增加而减小,荷载水平越高刚度退化越明显;试验梁中钢筋的应力范围是影响梁疲劳寿命的最主要因素;锈后钢筋混凝土梁疲劳寿命的降低主要是由钢筋的截面积减小和疲劳强度退化引起的,与黏结退化的关系不大,仅梁中钢筋最大应力的增大与黏结退化有关,且荷载水平越高黏结退化的影响越大;建议分析锈蚀钢筋混凝土梁的疲劳寿命时认为黏结退化对的梁的疲劳寿命无显著影响
근거6근모의시험량적피로시험결과,분석료강근엄중수식、점결력기본상실후강근혼응토량적파배형태、강도급피로수명퇴화.지출국부무점결량중강근적피로단렬위치도처유무점결적분계면상;시험량적강도수과중완전무점결구단장도적증가이감소,하재수평월고강도퇴화월명현;시험량중강근적응력범위시영향량피로수명적최주요인소;수후강근혼응토량피로수명적강저주요시유강근적절면적감소화피로강도퇴화인기적,여점결퇴화적관계불대,부량중강근최대응력적증대여점결퇴화유관,차하재수평월고점결퇴화적영향월대;건의분석수식강근혼응토량적피로수명시인위점결퇴화대적량적피로수명무현저영향
Based on the results of six simulative experimental beams, the failure pattern and the stifness and fatigue life degradation of reinforced concrete beams after serious corrosion of reinforcement and lose in the main of cohesion are analyzed. The fatigue fracture location of the locally no cohesion reinforced concrete beam is near the interface. The stiffness of locally no cohesion reinforced concrete beams decreases with the locally no cohesion length increasing, moreover, the loading level is higher and the stiffness degradation is more obvious. The farorable factor that affects fatigue life of the beams is the stress range of reinforcement in the beams. The fall of fatigue life of the corrosion reinforced concrete beams is resulted from the section area drcrease and fatigue strength deterioration of the reinforcement which has little relation with the cohesion deterioration, but the increase of maximum stress of reinforcement in the beam is related to the cohesion deterioration, and the higher the loading level,the higher the influence cohesion degradation is. There is no obvious relationship between the cohesion deterioration and the beams.