摘要
基于钢筋与混凝土黏结的局部滑移理论,将开裂后混凝土轴心受拉构件分为无滑移未开裂段和局部滑移段,以一个裂缝间距范围内这两段的平均刚度作为整个构件的刚度,推导出轴心受拉构件刚度的计算公式。该公式刚度计算值与试验值差距较大,但该公式计算的平均裂缝宽度与我国现行规范中的计算值吻合较好。给出了一个范例试件局部滑移长度和轴拉刚度随轴力增加的变化曲线。结果表明:局部滑移长度随轴力的增加近似线性延长;轴拉刚度在试件刚开裂时迅速退化,开裂后退化速度减缓。
Based on the local sliding theory for the bonding between steel bars and concrete, the cracked axial tensile member was divided into no-sliding uncracked part and local-sliding part, and the average stiffness of the two parts within a crack spacing was regarded as the stiffness of the whole member. A formula for the stiffness of axial tensile member was derived. The calculated stiffness by means of the formula was compared with the experimental data, and there was a large difference. However, the average crack width calculated by the formula agreed with that obtained by the methods in the current Chinese codes. The curves of the local sliding length and tensile stiffness versus the tensile force of a member specimen were provided. The results indicate that the local sliding length approximately linearly increases with the tensile force, and the tensile stiffness of the specimen quickly degrades at the starting of cracking and becomes slow after the cracking.
出处
《水利水电科技进展》
CSCD
北大核心
2011年第6期23-26,共4页
Advances in Science and Technology of Water Resources
关键词
钢筋混凝土
局部滑移理论
拉伸刚度
局部滑移长度
刚度退化
reinforced concrete
local sliding theory
tensile stiffness
local sliding length
stiffness degradation
