试验结果表明，玻璃纤维长丝纱有较明显的应力松驰现象，反复循环负荷作用对玻璃纤维长丝纱的强伸性能有较大的影响。
As a result, the stress-relaxation of yarn is obviously observed, and the cyclic loading has much more influence on the tensile property of yarn.
完成了16根无粘结预应力混凝土梁的低周反复荷载试验。
Specimens of 16 unbonded prestressed concrete beams under low cyclic loading were tested.
本文进行了有粘结和无粘结预应力混凝土框架的反复荷载试验。
Bonded and unbonded prestressed concrete frames are tested and analysed up to failure.
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