无粘结预应力混凝土框架柱钢绞线的应力分析研究  

Unbonded prestressed concerte frame column steel strand stress study

作　　者：赵少伟[1,2] 李玉祥[1] 丁彦芳 

机构地区：[1]河北工业大学土木工程学院,天津300401 [2]河北省土木工程技术研究中心,天津300401

出　　处：《河北工业大学学报》2015年第6期90-95,共6页Journal of Hebei University of Technology

基　　金：河北省交通运输厅科技计划(Y-2011052)

摘　　要：目前无粘结预应力混凝土的研究主要是对混凝土梁的试验研究,而对无粘结部分预应力混凝土框架柱的试验研究甚少,为深入了解无粘结部分预应力混凝土框架柱钢绞线的应力、极限应力增量以及预应力损失的计算情况,对2组5根试验柱进行拟静力试验研究.结果表明:现行《无粘结预应力混凝土结构技术规程》JGJ92—2004中的公式同样适用于无粘结部分预应力混凝土框架柱应力的计算,预应力度和预加轴压比均对无粘结预应力筋极限应力增量有很大影响;随着预应力度的提高,预应力筋极限应力增量增加;而随着预加轴压比的提高,预应力筋极限应力增量降低.The current experimental research on unbounded prestressed concrete focuses on the concrete beams, while it is rare for the experiment study of unbonded partially prestressed concrete frame column. In order to understand the unbonded partially prestressed concrete frame column steel strand stress, ultimate stress increment and calculation of the prestress stress loss, the paper focuses on the experimental study on the proposed static for five test column, and divided two groups. The results show that the current Technical specification for concrete structures of unbonded prestressed JGJ92-2004 formula is suitable for the stress calculation of unbonded partial prestressed concrete frame column. Prestressing degree and pre-axial compression ratio have a great influence on the unbonded prestressed tendon stress increment.With the improvement of prestressing degree, ultimate stress increment of prestressed tendon is increased; with the improvement of pre-axial compression ratio, the ultimate stress increment of prestressed tendon is reduced.

关 键 词：预应力度 预加轴压比 预应力损失 极限应力增量 无粘结部分预应力混凝土框架柱 

分 类 号：TU378[建筑科学—结构工程]