基于钢筋锈蚀的混凝土梁承载能力退化预计模型

A Model for Degeneration in Bearing Capacity of Concrete Beams with Corroded Reinforcing Bars

为了得到锈蚀钢筋混凝土梁承载力预计模型，在锈蚀混凝土梁截面应力应变基本假定基础上，运用普通混凝土理论和已有的锈蚀构件试验研究成果，建立了锈蚀程度相对较小的构件的正截面适筋延性破坏模型；运用极限平衡理论和拉杆拱模型求出钢筋滑移量与剪应力的关系，从而建立了不同锈蚀程度的钢筋混凝土梁正截面承载力预计模型．结果表明计算得到的破坏荷载值比试验值偏小，差别在10％～30％之间。

A model for normal section damage in corroded reinforcing beams with low levels of corrosion was developed. The model was based upon basic theory of common concrete structures and the results of corrosion tests. The relationship of steel slippage to shear stress was obtained using a balance limit theory and a pull rod arch model. The loss in normal section bearing capacity as corrosion proceeds is predicted. The results show that the calculated value is less than the test value by 10%-30%.