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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。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,并通过试验验证了模型的准确性。
The strength of reinforced concrete members in actual use due to fire, collision, corrosion and other phenomena are affected, of which the impact of corrosion is the most common. Corrosion of steel will cause the bond between concrete and steel to degrade, reduce the cohesion between the two and then reduce the bearing capacity of the reinforced concrete. At present, the problem of the decrease of bearing capacity caused by the degradation of bond strength caused by corrosion of steel bars, especially the degradation of local bond, has not yet been effectively solved. Taking the single-point loading of simply-supported beam as an example, a simplified calculation model for calculating the flexural capacity under partial unbonded condition is proposed through theoretical analysis. The accuracy of the model is verified through experiments.