预应力混凝土结构中的预应力是通过预应力筋的张拉和锚固来建立的。预应力筋的锚固或借锚具(后张法)或借混凝土与预应力筋之间的粘结力(即预应力筋的自锚能力)来保证。在预应力筋的锚固处,从施力处起,根据圣维南原理,至等于结构物高度(对梁来说即为梁的高度)的距离范围, Prestressing in prestressed concrete structures is established by tensioning and anchoring of tendons. Prestressed tendon anchorage or through the anchor (post-tension method) or by the bond between the concrete and prestressed tendons (that is, the self-anchoring capacity of prestressed tendons) to ensure. In the anchorage of prestressing tendons, from the point of application of force, according to Saint-Venant’s principle, to a range of distances equal to the height of the structure (the height of the beam for the beam)