摘要
在腐蚀钢与混凝土组合梁受拉区粘贴CFRP布进行加固并对其加固后的徐变效应进行研究。研究了徐变效应对组合梁变形能力的影响,给出徐变函数数学模型,建立预应力CFRP布加固钢与混凝土组合梁徐变效应分析模型,研究了组合梁在徐变效应影响下的变形性能。计算结果表明,沿梁长范围内,跨中截面处的变形最大,在荷载作用后的初始阶段,跨中变形有明显变化,之后各参数值随着时间的增长趋于一定值;跨中变形的增加量随混凝土强度、预拉力、梁截面宽度、腹板高度的增大而减小。
The behavior of damaged steel-concrete composite girders repaired with CFRP sheets under creep was studied. The deformation model of creep function was developed,then some analytic models based on visco-elasticity theory were given to the computation procedure of creep effect,such as the deformation. The calculation results along the whole span showed that the values of mid-span deformation are maximum. During the initial stage of loading,the values of all these parameters change obviously,and later on they approach to constant. The increment of mid-span deformation decreases with the increasing of the concrete strength,the prestressing,the beam section width and the height of web.
出处
《施工技术》
CAS
北大核心
2016年第10期69-72,共4页
Construction Technology
关键词
加固
CFRP布
钢与混凝土组合梁
徐变效应
变形
strengthening
CFRP sheets
steel-concrete composite girders
creep effect
deformation
