摘要
通过5根预应力钢绞线加固钢筋混凝土柱偏心受压试验,研究了预应力钢绞线加固后混凝土柱的破坏特征、偏压性能、破坏机理,对比了不同预应力、不同偏心距下加固后混凝土柱的极限承载力、侧向挠度、延性等性能。试验结果表明:预应力钢绞线加固方式充分发挥了钢绞线的侧向约束能力,当偏心距为20mm,钢绞线预应力为1k N、2k N所对应的构件承载力分别提高了9.14%、14.60%;当偏心距为40mm时,钢绞线预应力为2k N所对应的构件承载力提高了7.49%,极大地改善了原构件的力学性能。通过建立约束混凝土应力-应变关系,修正受压区等效矩形及界限相对受压区高度,给出了适用于预应力钢绞线加固小偏心钢筋混凝土柱承载力计算公式。
Test on eccentric compression of seven short concrete columns has been carried out. The damage characteristics, eccentric compression performance and failure mechanism of the columns strengthened with prestressed steel wire are studied. The ultimate load-bearing capacity, lateral deflection and ductility of concrete columns strengthened with different pretension forces and eccentric distances are also compared. Experimental results show that the prestressed steel wire reinforcement mode fully exerts the lateral restraint ability of the strand. For the case of the eccentricity is 20 mm, the bearing capacity of the components increase by 9.14% and 14.6%, corresponding to the prestress values of 1 k N and 2 k N, respectively. When the eccentricity is 40 mm, corresponding to the pretress value of 2 k N, the bearing capacity increases by 7.49% and the mechanical properties of the original component are greatly improved. By establishing the stress-strain relationship of the confined concrete, the equivalent rectangle and the relative height of the compression zone in the compression region are corrected, the formula for calculating the bearing capacity of the small eccentric reinforced concrete column strengthened with prestressed steel wire is provided.
出处
《应用力学学报》
CAS
CSCD
北大核心
2018年第4期886-893,共8页
Chinese Journal of Applied Mechanics
基金
国家自然科学基金(51608441)
陕西省自然科学基础研究计划(2017JQ5032)
陕西省高校科协青年人才托举计划(20170513)
关键词
预应力钢绞线加固
偏心受压试验
破坏机理
承载力计算公式
prestressed steel wire reinforcement
eccentric compression test
failure mechanism
bearing capacity calculation formula
