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对有粘结后张预应力混凝土梁的结构响应进行试验研究,建立数值分析模型。试验模拟了应力锈蚀的破坏效果,以及粘结筋在断裂端锚固的发展过程。测量了从加载到破坏的残余结构性能。考虑局部和整体参数,对带粘结预应力筋破坏以及加载梁的不同阶段,采用具有界面单元的非线性有限元模型进行模拟。假定预应力筋断裂引起的破坏分布出现在不同的位置,对不同的破坏模式进行了研究,总结了预应力结构的退化性能。
The structural response of post-tensioned prestressed concrete beams is experimentally studied and a numerical analysis model is established. The experiment simulates the destructive effect of stress corrosion and the development of the anchorage of the bond bar at the fracture. The residual structural performance from loading to destruction was measured. Considering the local and global parameters, the nonlinear finite element model with interface element is used to simulate the different stages of the failure of the prestressing tendon with bond and the loading of the beam. Assuming that the damage distribution caused by the fracture of prestressed tendons appears at different positions, different failure modes are studied, and the degradation properties of prestressed structures are summarized.