高强混凝土柱小偏心受压性能尺寸效应试验研究

Experimental Analysis of Size Effect of High-strength Concrete Column Under Small Eccentric Loading

为了解高强混凝土柱小偏心受压性能的尺寸效应,进行了3组不同几何尺寸的高强混凝土柱小偏心受压破坏试验,其截面几何尺寸分别为200mm×200mm、400mm×400mm、800mm×800mm,对比分析了其破坏形态、承载力、变形能力及截面应变分布规律,揭示了其尺寸效应规律。研究结果表明,高强混凝土柱的小偏心受压破坏形态和横截面应变分布规律基本相同,其尺寸效应不明显;高强混凝土柱的小偏心受压承载力和变形能力存在明显尺寸效应,随着截面尺寸的增大,其极限承载力的安全储备量减小,变形能力减弱。

To analyse size effect of high-strength concrete column under small eccentric loading,experimental analysis was carried out on 3 categories of different sizes of high-strength concrete columns under small eccentric loading.The columns＇ section size was 200 mm × 200 mm,400 mm × 400 mm and 800 mm × 800 mm,respectively.Failure mode,ultimate strength,deformation capacity and cross-sectional strain distributing rules were compared to get the size effect law.The results show that the compressive failure mode and cross-sectional strain distributing rules of HSC column under small eccentric loading are basically the same,and the size effect isn＇t obvious.Ultimate strength and deformation capacity of HSC column under small eccentric loading have size effect obviously.With increase of section size,safety reservation of ultimate strength is reduced and deformation capacity also reduces.