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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。结果表明,试件能够形成塑性铰;有粘结框架的耗能量大于无粘结框架,但无粘结框架的残余变形比有粘结框架小:试验后无粘结框架的预应力损失可略去不计,而有粘结框架在塑性铰处的预应力损失则达70%。本文提出的算法实现了预应力框架包括下降段在内的有限元全过程滞回分析,同时也可适用于非预应力框架。
In this paper, repeated loading tests of bonded and unbonded prestressed concrete frames are performed. The results show that the specimen can form a plastic hinge; the energy consumption of the bonded frame is greater than that of the unbonded frame, but the residual deformation of the non-bonded frame is smaller than that of the bonded frame: the loss of prestress of the unbonded frame after the test can be omitted. Excluding it, the prestress loss of the bonded frame at the plastic hinge is up to 70%. The algorithm proposed in this paper realizes the hysteresis analysis of the finite element in the whole process including the descending section of the prestressed frame, and it can also be applied to non-prestressed frames.