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大量锈蚀钢筋混凝土偏压构件的实验研究表明,随着纵向受力主筋锈蚀率的增大,偏心受压构件的承载力及其刚度均有不同程度的降低。并且由于钢筋锈蚀,钢筋混凝土偏心受压构件延性也随之降低,脆性性质明显,从而可能使得钢筋混凝土偏压构件的破坏形态发生变化。在对预制钢筋混凝土柱进行快速锈蚀实验85研究的基础上,对锈蚀偏心受压构件的结构性能退化机理和破坏特征进行了分析;在现行计算理论和实验85结果分析的基础上,通过拟合出的锈蚀钢筋与混凝土间的应变不协调系数,对未锈蚀构件的相对界限受压区高度进行修正,得到了锈蚀偏心受压构件相对界限受压区高度的修正公式;考虑锈蚀钢筋截面的削弱、钢筋屈服强度的降低以及钢筋和混凝土之间粘结性能退化的影响,提出锈蚀偏心受压构件正截面承载力计算方法,为今后混凝土结构耐久性评估和可靠性鉴定提供了科学依据。
Experimental studies on a large number of corroded reinforced concrete biasing members show that the bearing capacity and stiffness of eccentric compression members decrease with different degrees as the corrosion rate of the main reinforcement increases. And due to the corrosion of steel bar, the ductility of reinforced concrete eccentric compression member also decreases, and the brittle nature is obvious, which may cause the failure mode of reinforced concrete biasing member to change. On the basis of the rapid corrosion test of precast reinforced concrete columns (85), the degradation mechanism and failure characteristics of the structural components of the corroded eccentric compression members were analyzed. Based on the analysis of the current calculation theory and experiment results 85, The coefficient of strain uncoordinated between the corroded steel bars and the concrete is deduced, and the relative limit of the non-corroded components is corrected to the height of the compression zone. The formulas for correcting the relative height of the compression sections of the corroded eccentric compression members are obtained. , The decrease of the yield strength of the steel bar and the degradation of the bond performance between the steel bar and the concrete, the calculation method of the normal section bearing capacity of the corroded eccentric compression member is proposed, which provides a scientific basis for the durability evaluation and reliability identification of the concrete structure in the future.