使用荷载下无粘结部分预应力混凝土梁的应力分析  

STRESS ANALYSIS OF UNBONDED PARTIALLY PRESTRESSED CONCRETE BEAM UNDER SERVICE LOAD

作　　者：杜进生 赖国麟[2] 

机构地区：[1]甘肃省交通科学研究所 [2]东南大学

出　　处：《土木工程学报》1998年第1期72-75,共4页China Civil Engineering Journal

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.

关 键 词：无粘结 部分预应力 混凝土梁 应力分析 荷载 

分 类 号：TU378.801[建筑科学—结构工程]