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通过3根不同级配的再生粗骨料混凝土简支梁在集中荷载作用下受弯性能的试验,采用分形理论,对其表面的裂缝的扩展及分布特征进行分析。研究表明:试验梁的表面裂缝具有分形的相似性特征,不同级配的再生粗骨料对再生混凝土试验梁表面裂缝的分形维数显著的影响,且分形维数与荷载间存在较好的线性关系,故可用分形维数表征试验梁的损伤程度。
Through the experiment of three different grades of recycled coarse aggregate concrete simple beams subjected to concentrated load, the fractal theory was used to analyze the expansion and distribution characteristics of the cracks on the surface. The results show that the fractures of the test beams have similar fractal characteristics, and the different gradations of recycled coarse aggregates have a significant effect on the fractal dimension of the surface cracks of the regenerated concrete test beam. The fractal dimension and the linearity between the loads have good linearity The fractal dimension can be used to characterize the damage degree of the test beam.