CAJ | 학술논문

基于传统的用于疲劳可靠性分析的累积损伤模型和英国BS5400规范中标准疲劳车，以某钢筋混凝土梁桥为背景，研究了车辆超载对钢筋混凝土梁桥疲劳可靠度的影响和车辆超载与交通量增长同时作用下该钢筋混凝土梁桥疲劳可靠度的时变规律。研究结果表明：在相同的使用寿命情况下，超载水平越高，细节的疲劳可靠度指标越低，发生疲劳失效的概率相应也越大；同时考虑超载与交通量增长将大大缩短桥梁的疲劳寿命。与只考虑超载情况相比，服役后期细节的疲劳可靠度指标将急剧减小，桥梁在设计基准期内发生疲劳破坏的风险将显著增加。
기우전통적용우피로가고성분석적루적손상모형화영국BS5400규범중표준피로차，이모강근혼응토량교위배경，연구료차량초재대강근혼응토량교피로가고도적영향화차량초재여교통량증장동시작용하해강근혼응토량교피로가고도적시변규률。연구결과표명：재상동적사용수명정황하，초재수평월고，세절적피로가고도지표월저，발생피로실효적개솔상응야월대；동시고필초재여교통량증장장대대축단교량적피로수명。여지고필초재정황상비，복역후기세절적피로가고도지표장급극감소，교량재설계기준기내발생피로파배적풍험장현저증가。
Based on traditional model of cumulative fatigue damage and standard fatigue vehicles of British BS5400,a reinforced concrete bridge is taken as the engineering back-ground,and the overloaded vehicles’effect on the fatigue reliability of reinforced con-crete bridge and the time-variant law of the fatigue reliability are studied in details with the consideration of vehicle overload and traffic growth.The results show that the higher level of the overload is,the detail fatigue reliability will be lower and the probability of fatigue failure will be greater.Vehicle overload with traffic growth will greatly shorten the fatigue life of the bridge,compared with only considering the vehicle overload,the details of the service post-fatigue reliability will dramatically reduce,and the risk of fa-tigue failure will increase significantly,which can be as a reference for the bridge design.