大跨度预应力混凝土梁张拉测试计算

对连续多跨预应力混凝土梁的群锚预应力筋采用单根张拉方式进行应力测试,探讨无粘结预应力筋束的张拉工艺,获得了计算预应力损失的有关参数,发现长无粘结预应力筋束在张拉中存在粘滞现象,掌握了单根张拉、后张拉的预应力筋对已张拉锁定了的预应力筋的应力影响程度和裂缝控制条件等,对预应力混凝土构件的设计和施工有较好的参考价值.

Testing count of big span prestressed concrete girder

Test has been done to find a new way that we can prestress to the single reinforcing steel bar for consecutive concrete beam. While prestressing technics being discussed, we acquire concerned parameters of counting loss of prestressing, find the sticky phenomena about long prestressed reinforcing steel bar, hold influence degree of stress and control condition of crevasse of locked prestressed reinforcing steel bar when we prestress to it singly and later etc. It can offer preferable reference merit to designs and constructions of prestressed concrete structure.