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本文提出了预应力混凝土梁在裂缝出现前、长期荷载下的反拱和挠度的计算方法。它适用于先张或后张、有粘结或无粘结预应力筋及混合配筋等各种情况的静定与超静定结构。对32根试验梁进行了长期观测和分析,验证了理论值和实测值符合较好。同时还发现了混合配筋梁由于配筋布置的不同,梁的反拱可以随时间延长而增大,也可以保持不变,甚至还可以随时间延长而减小,出现反拱逐渐消失现象。
This paper presents the calculation method for the anti-arch and deflection of prestressed concrete beams before and during the cracks. It is applicable to the statically and statically indeterminate structures of pre-tensioned or post-tensioned, bonded or unbonded prestressed tendons and mixed reinforcements. The long-term observation and analysis of 32 test beams have verified that the theoretical values are in good agreement with the measured values. At the same time, it has been found that due to the different arrangement of reinforcements, the hybrid arch reinforcement can increase with time, or it can remain unchanged, or even decrease with time, and the arches gradually disappear.