既有钢筋混凝土结构构件承载力估算方法

Estimated approach of carrying capacity of constructed RC beam

既有钢筋混凝土结构在使用过程中逐渐老化,使用功能下降主要表现为材料腐蚀劣化和截面破损,这些都将导致混凝土构件承载能力下降.其实际承载能力不可能通过破坏试验得到,往往通过一些无损检测方法对构件进行检测后依靠工程师的经验给出一个保守的估计.利用模糊数学和层次分析法把这些既相互关联又相互影响的不确定因素系统化,通过模糊隶属函数将定性描述定量化,从而计算出在这些影响因素下的综合折减系数,再与根据实测参数结合规范计算得到的结果相结合,来估算既有钢筋混凝土构件承载力,从而提高对既有钢筋混凝土结构承载能力评估的准确性.

Based on analysis of some factors reducing the carrying capacity of constructed RC structure, the fuzzy mathematics and analytic hierarchy process （AHP） method were used to quantitate the quality index of these factors tested by nondestructive examination. The carrying capacity reduction coefficient, include all the factors mentioned above is calculated. The effective carrying capacity is estimated based on the parameters measured from the RC member and theoretic formula, thus evidently enhancing the veracity of evaluation.