PVC套管约束混凝土短柱偏心受压力学性能试验研究

Experimental study on mechanical properties of eccentrically loaded PVC tubed short reinforced concrete columns

为了研究PVC套管约束混凝土短柱的偏压力学性能,进行了12个PVC套管约束混凝土短柱和12个无PVC套管约束的混凝土短柱对比试验。研究了影响PVC约束混凝土短柱偏压力学性能的主要因素,包括PVC套管内混凝土强度、荷载偏心距、有无PVC管约束等。试验结果表明:由于PVC套管的约束,提高了混凝土的承压强度,增大了核心混凝土的变形能力;随着混凝土强度的提高,PVC套管混凝土的承载力提高,但PVC套管对混凝土的约束效果有所降低;随着荷载偏心距的增大,PVC套管混凝土的承载力降低、挠度增大,PVC套管对核心混凝土的约束效果逐渐降低。

Twelve PVC tubed short concrete columns and twelve columns without PVC tube confined were tested under eccentrically load to investigate mechanical properties of eccentrically loaded PVC tubed short concrete columns. The principal influencing factors such as concrete strength,loading eccentric distance and PVC tubed were studied.Test results indicate that strength and deformation per- formance of core concrete are increased as a result of the confinement of PVC tube. The strength of PVC tubed short reinforced concrete columns would improve with the improvement of the strength of concrete, but the PVC tube confinement effect on concrete will de- crease with increase in strength of concrete. With the improvement of loading eccentric distance, the strength of test - piece would de- crease and its deformation would increase and the PVC tube confinement effect on concrete would gradually reduce.