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混凝土材料的变异性是造成钢筋混凝土结构非线性受力行为不可精确预测和不可准确控制的重要原因之一。考虑混凝土材料抗压强度的变异性,将具有确定性和高精度特征的拟蒙特卡洛法引入到钢筋混凝土框架结构的非线性静、动力分析中,结合增量变异性分析方法,定量分析了钢筋混凝土框架结构材料的变异性对构件和结构尺度非线性静、动力响应变异性的影响规律。研究结果表明:混凝土材料的变异性在构件尺度和结构尺度具有不同程度的衰减;混凝土材料的变异性在构件尺度呈现出复杂的随机演化特征,导致构件破坏模式和内力重分布路径的多样;在结构尺度,尤其是结构承载力和自振周期上具有相对的稳定性,这为结构整体失效模式的控制提供了可能。
The variability of concrete materials is one of the important reasons that the nonlinear behavior of reinforced concrete structures can not be accurately predicted and accurately controlled. Considering the variability of compressive strength of concrete materials, the quasi-Monte Carlo method with certainty and high precision is introduced into the nonlinear static and dynamic analysis of reinforced concrete frame structure. With the method of incremental variability analysis, The Influence of Variability of Material of Reinforced Concrete Frame Structure on Nonlinear Static and Dynamic Variability of Structural and Structural Scales. The results show that the variability of concrete material has different degrees of attenuation at the component scale and structural scale. The variability of concrete material shows complex random evolution characteristics at the component scale, which leads to the diversity of component failure mode and internal force redistribution path. The structural scale, especially the structural bearing capacity and the period of natural vibration have relative stability, which makes it possible to control the overall failure mode of the structure.