摘要
钢筋混凝土构件的强度在实际使用中会由于火烧、碰撞、腐蚀等现象受到影响,其中腐蚀的影响是最为普遍的。钢筋腐蚀会引起混凝土与钢筋之间的粘结退化,减小两者之间的粘结力进而减小钢筋混凝土构件的承载力。目前由钢筋腐蚀产生粘结力退化(特别是局部粘结的退化)而引起构件承载力降低的问题尚未得到有效解决。本文以跨中单点加载简支梁为例,通过理论分析,提出一种计算局部无粘结情况下抗弯承载力的简化计算模型,并给出局部无粘结混凝土梁承载力计算的一系列公式,最后通过实验验证了模型的准确性。
There are many factors can lead to strength decrease of RC structures, among which corrosion is the most common one. Corrosion of reinforcing steel bar will reduce RC beams＇ bond srength, which will contribute to the load carrying capacity decrease of RC beams. At present, it is necessary to establish a model to estimate the reduced load carrying capacity of partially unbonded RC beam. In the present paper, a simplified analyzing model is proposed and a series of equations far calculating the load carrying capacity of partially unbonded RC beam under mid-span concentrated load is given. The result of the model is compared with experimental result.
出处
《低温建筑技术》
2009年第4期62-65,共4页
Low Temperature Architecture Technology
关键词
局部无粘结
钢筋混凝土梁
承载力
partially unbonded
RC beam
load carrying capacity
