大跨预应力混凝土连续梁张拉方式的试验研究  

Testing research on the way of big span prestressed concrete girder

作　　者：李纯[1] 付诗梦[1] 张淼[1] 曹文宇[1] 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819

出　　处：《混凝土》2013年第8期21-23,28,共4页Concrete

基　　金：国家自然科学基金资助项目(90915005)

摘　　要：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,探讨无黏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,发现长无黏结预应力筋束在张拉中存在黏滞现象,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。Test has been done to find a new way that we could prestress to the single reinforcing steel bar for consecutive concrete beam.While prestressing technics being discussed,we acquired concerned parameters of counting loss of prestressing,found the sticky phenomena about long prestressed reinforcing steel bar,held 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 design and constructions of prestressed concrete structure.

关 键 词：群锚 超张拉 控制应力 应力滞后 

分 类 号：TU528.01[建筑科学—建筑技术科学]