玄武岩筋碱激发海砂混凝土梁裂缝分形理论分析

Study of Cracks on Alkali-activated Sea Sand Concrete Beam with BFRP Bars Based on Fractal Theory

基于玄武岩筋碱激发海砂混凝土梁和钢筋碱激发海砂混凝土梁的弯曲试验,运用分形理论对试验梁表面裂缝进行分形分析。验证了试验梁表面裂缝具有自相似性,其分形维数在0.9~1.1之间;探讨了荷载等级与分形维数之间的关系。结果表明,荷载等级与分形维数之间呈对数增长关系,分形维数随着荷载的增大而增大。研究结果可为玄武岩筋碱激发海砂混凝土梁在工程中的应用提供参考。

Based on the experimental study on flexural behavior of BFRP reinforced alkali-activated sea sand concrete beam and reinforced alkali-activated sea sand concrete beam,the fractal theory was used to analyze the cracks of the beams.It was verified that the cracks of the test beam were self-similarity,and its fractal dimension was between 0.9 and 1.1.The relationship between load grade and fractal dimension was discussed.The results show that there was a logarithmic growth relationship between the load grade and the fractal dimension,and the fractal dimension increases with the increase of the load.The research results can be used as a reference for the application of BFRP reinforced alkali-activated sea sand concrete beams in engineering.