有粘结和无粘结预应力锚索在混凝土结构中的应用

Application of prestressed cables with and without bond in concrete structure

从有粘结和无粘结预应力锚索的基本概念出发,分析了2种结构的变形、受力机理。在混凝土及岩锚工程中具体采用何种形式应根据具体情况决定,并优先考虑采用有粘结预应力锚索。为了充分发挥预应力的特点,限制混凝土的裂缝,在混凝土梁板设计时,使用无粘结预应力锚索一定要与非预应力钢筋结合。在水电站预应力闸墩设计时采用有粘结预应力锚索。在水电站边坡工程岩石锚固设计中,根据实际揭示的地质资料和监测资料,随时调整设计。由于边界条件、参数等的不确定性,设计随岩石变位而能及时调整对岩体预应力的锚固体系是较合理的。

In view of the basic concept of prestressed cables with and without bond, two kinds of structural deformation and stressing mechanism are analyzed. In concrete and rock bolt works, as what kind of prestressed cable to be applied shall be determined in accordance with to specific circumstances, the priority shall be given to prestressed cable with bond. To fully develop prestressing characteristics and restrain concrete cracks, prestressed cables without bond shall be applied with non -prestressed reinforcement in the design of concrete beam slab. In the design of prestressed piers for a hydropower project, prestressed cables with bond shall be adopted. The design for rock anchorage of the slope shall be adjusted in compliance with the actual exposed geological and monitoring data at any moment. Owing to uncertainty of boundary conditions and parameters, it is rather appropriate to timely adjust prestressed anchorage system of rock mass with rock displacement.