钢纤维混凝土四桩承台灰色关联分析

Grey Correlation Analysis of sFRC Thick Pile Capwith Four Piles

钢纤维混凝土四桩承台的性能试验研究结果表明，影响其极限荷载的因素有承台有效厚度、钢纤维体积率、混凝土基体强度等级、承台的剪跨比和纵向钢筋配筋率等。为了经济有效地提高承台的极限承载力，应用灰色系统理论，对钢纤维混凝土四桩承台极限荷载及其关联因子进行了关联度分析，找出了影响极限荷载的主要因素是承台的有效厚度，其次是混凝土基体强度等级和钢纤维体积率。在经济技术条件允许的情况下，增大承台厚度并采用较高强度等级的混凝土，可显著地提高承台的极限荷载。

An experimental research on steel fiber reinforced concrete(SFRC).thick cap with four piles indicates that the factors affecting its ultimate loads arecomposed' of its effective thickness,steel fiber volume ratio, concrete strength grade, shearspan length and steel ratio.According to the test of 15 specimens,the grey correlationdegree of the ultimate loads and the correlation factor of SFRC pile cap with four piles areanalysed by grey system theory,and the main factors influencing the ultimate loads are theeffective thickness of pile cap,concrete strength grade, and steel fiber volume ratio. Thecorrelation factor of the ultimate loads of SFRC pile cap can be enhanced by increasing theeffective thickness and utilizing high-intensity concrete.