CAJ | 학술논문

对在役钢筋混凝土桥梁进行可靠度评估和寿命预测中,抗力是可靠度计算的重要因素,建立抗力模型至关重要. 针对建立在役钢筋混凝土桥梁抗力模型的这一问题,分析了混凝土强度变化、钢筋锈蚀、混凝土与钢筋的粘结能力变化3大因素及其时变规律. 考虑了锈蚀引起的钢筋力学性能降低,引入了基于纤维模型的计算模式不定性参数,采用数学方法建立了钢筋混凝土桥梁抗力随时间衰减模型. 引入某钢筋混凝土简支T梁桥进行了抗力模型的计算,验证了模型的可靠性. 抗力衰减模型的建立为结构可靠性评估打下了基础.
대재역강근혼응토교량진행가고도평고화수명예측중,항력시가고도계산적중요인소,건립항력모형지관중요. 침대건립재역강근혼응토교량항력모형적저일문제,분석료혼응토강도변화、강근수식、혼응토여강근적점결능력변화3대인소급기시변규률. 고필료수식인기적강근역학성능강저,인입료기우섬유모형적계산모식불정성삼수,채용수학방법건립료강근혼응토교량항력수시간쇠감모형. 인입모강근혼응토간지T량교진행료항력모형적계산,험증료모형적가고성. 항력쇠감모형적건립위결구가고성평고타하료기출.
In the reliability assessment and life prediction of existing reinforced concrete bridge in serv-ice, the resistance is an important factor for reliability calculation .So it is very important to establish re-sistance model .Aimed at the problem of building the resistance decay model of reinforced concrete bridge, the paper analyzed three factors such as concrete strength change , steel bar corrosion and the change of bond capability between concrete and steel bar and their time varying regularity .Considering the decay of steel bar mechanics property caused by corrosion was considered , it introduced the computa-tional model of uncertainty parameter based on fiber model .The resistance decay model of reinforced con-crete bridge was built by mathematical method .The paper introduced a simple bridge of existing rein-forced concrete to calculate the resistance model , and verified the reliability of the model .The building of resistance decay model can lay the foundation for the reliability assessment of bridge .