Abstract:

According to the loading characteristics of bonded post-tensioned prestressed concrete frames，a program is worked out to perform a nonlinear finite element analysis for the static staff in both the stretching wire stage and the loading stage. In working out the program,the relationship between the stress and the strain of the material is directly employed,the tension hardening and compression softening of concrete are considered,the sectional lay-ered finite element model and the arc-length method are adopted,and both the material nonlinearity and the geo-metric nonlinearity are taken into account in the stiffness matrix. As compared with the experimental results of two prestressed concrete frames,the simulated results obtained by the program are of high precision,meaning that the proposed program is suitable for the calculation and analysis of bonded post-tensioned prestressed concrete frames.

Key words: arc-length method, prestressed frame, nonlinear analysis, loading model, exterior load, layered finite element model