摘要：This paper presents an application of strut-and-tie model(STM) to design the interior anchorage zone(IAZ) in the post-tensioned concrete *** STM theory and range of IAZ are ***,based on the finite element analysis,a series of simplified equations to calculate internal forces in IAZ are ***,the STM model for IAZ is *** the proposed STM model,internal forces in ties vary with the dimension ratio and the eccentricity of *** U-turn of internal forces is suggested to allocate rebar to resist bearing flexural tensile *** with the FIP(International Federation for Prestressing) model,the proposed STM model is more reasonable and applicable.