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为了解决沿海地区正常使用工作状态下承受较大持续荷载钢筋混凝土(reinforced concrete,RC)梁的力学性能劣化问题,通过实验室模拟经历180 d大气环境+180 d海水喷淋干湿循环(简称Ⅰ腐蚀)或180 d海水喷淋干湿循环+180 d大气环境(简称Ⅱ腐蚀)后,由静力加载试验测试RC梁试件力学性能劣化规律.试验结果,RC梁试件在不同持续荷载和一定腐蚀环境共同作用下,随着持续荷载增大其屈服荷载P_y、极限荷载P_m和延性系数u降幅变大.Ⅱ腐蚀梁试件的P_y、P_m和u降幅大于Ⅰ腐蚀梁试件的P_y、P_m和u降幅.梁试件的抗弯刚度随着持续荷载增大而降低.试验结果表明较大持续荷载与一定腐蚀环境共同作用对RC梁力学性能劣化影响明显.
In order to solve the problem of mechanical properties deterioration of RC beams under normal working condition in coastal area, the 180 d atmospheric environment 180 d seawater spray wet-dry cycles (abbreviated as Ⅰ Corrosion or 180 d seawater spray drying and wetting cycles +180 d atmospheric environment (referred to as Ⅱ corrosion), the mechanical properties of RC beams were tested by static loading test.Results of the test, RC beams under different continuous loads and Under the combined action of certain corrosive environment, the ultimate load P_m and the ductility coefficient u decrease more with the increase of the continuous load, P_y, P_m and u of the corrosion specimen are larger than P_y of the corrosion specimen I, P_m and u.The flexural rigidity of beam specimens decreases with the increase of continuous load.The results show that the effect of large continuous loads and certain corrosive environment on the mechanical properties of RC beams deteriorates obviously.