摘要
使用荷载下无粘结部分预应力混凝土梁应力分析的主要困难,是如何确定无粘结预应力筋的应力.本文引用文献[1]提出的“等效变形区”的概念,并认为使用荷载下,无粘结预应力筋的应力和“等效变形区长度与开裂截面中性轴高度” 的比值有关.通过对无粘结部分预应力混凝土梁试验数据的分析及应用弯矩曲率数值法计算,发现这一比值基本为常数,并取为15.2.使用荷载下,无粘结部分预应力混凝土梁的应力分析和相应有粘结部分预应力混凝土梁一样方便.
The main difficulty of stress analysis of unbonded partially prestressed concrete beam is how to determine unbonded tendons stress. This paper uses the concept of e-quivalent deformation area given in reference [ 1 ] and considers that the stresses in unbonded partially prestressed tendons under service load are related to the ratio between the length of equivalent deformation area and the depth of neutral axis in crack section. Based on the analysis of the test data and computer calculation, it is shown that this ratio is approaching a constant value and can be taken as 15.2. Thus, a simple equation for analysing the stress of unbonded partially prestressed concrete beam is presented, it is easy to use as that for analysing bonded partially prestressed concrete beam.
出处
《土木工程学报》
EI
CSCD
北大核心
1998年第1期72-75,共4页
China Civil Engineering Journal
关键词
无粘结
部分预应力
混凝土梁
应力分析
荷载
unbonded, partially prestressed concrete, beam, stress analysis.
