锈蚀及疲劳损伤后钢筋混凝土梁寿命预测及敏感性分析OA北大核心CSTPCD

In order to investigate the long-term performance of reinforced concrete beams after corrosion and fatigue,a calculation model for the long-term performance of reinforced concrete beams with initial damage was established based on the tests.The limit state equation of reinforced concrete beam after corrosion and fa-tigue damage was established based on the model.Monte Carlo Simulation was used to study the time-varying reliability of the long-term performance of the beam,and the life prediction was conducted.The critical serv-ice condition of the test beam to meet the 100 a service life was studied.The results show that corrosion and fatigue can seriously weaken the long-term performance of reinforced concrete beams,and the long-term per-formance of beams with only 4％corrosion rate and 15％fatigue damage cannot meet the service require-ments.Increasing the cross-sectional area and cross-sectional height of the steel bar can effectively improve the long-term performance of the beam.Increasing the section width of the beam can only improve the long-term performance of the beam with small initial damage.