本文采用碳纤维布和外包钢两种加固方法，对6个混合装配无粘结预应力梁进行了低周反复加载试验。
The test of 6 hybrid precast unbonded post-tensioned concrete beams under reversed cyclic loading is carried out.
研究结果表明，低周拉扭疲劳加载下，拉与扭应力响应的硬化与软化特性取决于应变加载路径和加载参数。
The results showed that the characteristics of cyclic hardening or softening depend to the strain loading paths and the loading parameters.
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