【摘要】 预应力混凝土结构在服役期间由于受到环境腐蚀的作用，会造成钢筋腐蚀，从而使结构出现不同程度损伤，导致结构承载力下降。为了探究钢筋腐蚀对预应力混凝土梁抗弯性能的影响，对预应力混凝土梁进行了腐蚀后的四点弯曲试验，结果表明：当钢绞线腐蚀率相同时，试验梁的开裂荷载和极限荷载受钢筋腐蚀影响不大，但对屈服荷载影响比较明显；当普通钢筋腐蚀率为3.8%时，试验梁屈服荷载下降15.6%；钢筋腐蚀率对试验梁的屈服挠度影响较小，但对极限挠度影响较为明显；当钢筋腐蚀率为11.5%时，极限挠度下降8.6%；试验梁的开裂荷载和屈服荷载受钢绞线腐蚀影响较大，是影响预应力梁承载能力和变形能力的主要因素；当钢绞线腐蚀率为7.6%时，试验梁的开裂荷载下降32.9%。在试验的基础上，采用有限元软件ABAQUS对各腐蚀梁进行有限元模拟，并根据腐蚀后钢筋的性能劣化规律，提出了普通钢筋腐蚀和钢绞线腐蚀预应力混凝土梁承载力计算方法，计算值和模拟值均与试验值吻合程度较好。更多还原

【Abstract】 Prestressed concrete structures are subject to environmental corrosion during service,resulting in corrosion of the reinforcement and varying degrees of damage to the structure.This leads to a reduction in the structural load carrying capacity.To investigate the effect of the reinforcement corrosion on the flexural performance of prestressed concrete beams,corroded prestressed concrete beams were tested by a four-point bending test.It is shown that the corrosion of the ordinary reinforcement has a small effect on the cracking strength and ultimate strength of test beams.However,the effect of corrosion on the yield load is more obvious.When the corrosion rate of ordinary steel reinforcement is 3.8%,the yield load of the test beams decreases by 15.6%.Additionally,the corrosion rate of steel reinforcement has a smaller effect on the yield deflection of the test beams,but the effect on the ultimate deflection is more obvious.When the corrosion rate of steel reinforcement is 11.5%,the ultimate deflection decreases by 8.6%.The corrosion of the prestressed steel strand has a significant effect on the cracking load and yield load of the test beams,which is the main factor affecting the load carrying capacity and deformation capacity of the prestressed beams.The cracking load of the test specimen decreases by 32.9% when the strand corrosion rate is 7.6%.Based on experimental data,finite element software ABAQUS is used to simulate the finite element calculation of each corroded beam.Meanwhile,a calculation method for the bearing capacity of prestressed concrete beams with corroded ordinary steel bars and corroded steel strands was proposed,based on the performance degradation patterns of corroded reinforcement.Both calculated and simulated results show good agreement with experimental data.更多还原