预应力锚固区的加载破坏过程初探

综合考虑混凝土、锚垫板和箍筋的材料非线性本构特性,探讨预应力锚固区加载破坏模式的发展过程,以确定其受压极限状态和极限承载力,为锚固区的工程设计提供参考.采用现有计算软件对锚固区的加载过程进行了三维模型的非线性有限元分析,其计算结果与实验结果符合较好,由此得到锚固区破坏模式发展和受压极限状态的初步规律.

Study on Progressive Failure Process of Post-tensioned Anchorage Zone

With nonlinear constitutive properties of concrete and steel involved,a study on progressive failure process of post-tensioned anchorage zone is presented.Such a study will benefit to the design of anchorage zone on the definition of ultimate bearing state and corresponding ultimate bearing capacity.A 3D finite element analysis in use of available software is applied to simulate an incremental loading process of a post-tensioned anchorage zone.Numerical results show a reasonable agreement with the experimental data.Initial knowledge about damage propagation and ultimate bearing capacity of the anchorage zone under axial load are then obtained.