A precast posttensioned (PT) concrete frame, which consists of PT composite beams, precast columns, and cast‐in‐place (CIP) core regions, was developed as an emulative structure in this paper. Cyclic loading tests were conducted on two 1/3‐scale frames, including a precast frame and a CIP control specimen, to investigate the seismic performance. The axial compression ratios of the specimens were 0.4 and 0.3 for the interior and exterior columns, respectively. The test results showed that the precast frame failed in mixed sidesway mechanism which was similar to that of the CIP control specimen. The hysteresis loops of both the precast and CIP frames were pinched but relatively plump, which exhibited good energy dissipation. The loading capacity of the precast frame was comparable to that of the CIP control specimen, and the deviation of average value was less than 5%. The average ductility of the roof, first interstory, and second interstory of the precast frame was 4.18, 4.24 and 4.18, respectively, which was approximate to that of the CIP control specimen. The stiffness degradation of the precast frame was also found to be quite similar to that of the CIP control specimen. Based on the test results, a degenerated four‐linear restoring force model was developed.

中文翻译：

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低反向循环荷载下预制后张预应力混凝土框架的抗震性能

本文开发了一种预制的后张预应力（PT）混凝土框架，该框架由PT复合梁，预制柱和现浇（CIP）核心区域组成。在两个1/3级框架上进行了循环荷载测试，包括一个预制框架和一个CIP控制标本，以研究抗震性能。内柱和外柱的轴向压缩比分别为0.4和0.3。测试结果表明，预制框架在混合侧移机理中失效，这与CIP对照样品相似。预制框架和CIP框架的磁滞回线都被捏住，但相对较饱满，表现出良好的能量耗散。预制框架的承载能力与CIP对照试样的承载能力相当，平均值偏差小于5％。预制框架的屋顶，第一层和第二层的平均延展性分别为4.18、4.24和4.18，这近似于CIP对照样品的延展性。还发现预制框架的刚度退化与CIP对照试样的刚度退化非常相似。根据测试结果，建立了退化的四线性恢复力模型。