Corrosion as a major threat to civil infrastructures has been extensively investigated for decades. For precast concrete structures, corrosion medium are easier to penetrate into structural joints where precast components are connected or post-casting is applied. The corrosion process and structural deterioration, however, highly depend on structural configuration and construction procedure. Taking the frame structure comprised of precast prestressed concrete components (SCOPE) for example, this paper presents an experimental study on the seismic behaviors of corroded beam-column joints of the SCOPE system. Five specimens with different levels of corrosion were tested under cyclic loading, and crack propagation, hysteretic loops, envelope curves, bearing capacity, ductility and energy dissipation were compared and analyzed. It is observed that the cracking in concrete and the cross-sectional loss of corroded bars had a more obvious influence on the yielding load but had a relatively smaller influence on the ultimate load. The asymmetrical structural configuration of the beam-column joint resulted in non-uniform corrosion of the reinforcing steel bars in the top and bottom of the beams; accordingly, the post-peak behaviors of the specimens in positive and negative loading were different. The difference was found to be more significant with the increase of the corrosion ratio. A numerical method is proposed for simulating the behaviors of corroded beam-column joints through the constitutive models for concrete and steel reinforcements, and agreement is observed between simulated and experimental results.

作为对民用基础设施的主要威胁，腐蚀已进行了数十年的广泛研究。对于预制混凝土结构，腐蚀介质更容易渗透到连接预制构件或应用后浇铸的结构缝中。然而，腐蚀过程和结构劣化在很大程度上取决于结构构造和施工程序。以预制预应力混凝土构件（SCOPE）组成的框架结构为例，本文对SCOPE系统腐蚀的梁柱节点的抗震性能进行了实验研究。在循环载荷下测试了五个腐蚀程度不同的试样，并对裂纹扩展，磁滞回线，包络曲线，承载力，延性和能量耗散进行了比较和分析。可以看出，混凝土的开裂和锈蚀钢筋的截面损失对屈服荷载的影响更为明显，而对极限荷载的影响相对较小。梁柱节点的结构不对称导致梁的顶部和底部的钢筋腐蚀不均匀。因此，样品在正负载荷下的峰后行为是不同的。发现随着腐蚀率的增加该差异更显着。提出了一种通过钢筋混凝土本构模型来模拟锈蚀梁柱节点行为的数值方法，并在模拟结果与实验结果之间取得了一致。