钢管自应力自密实混凝土柱偏心受压试验研究

为分析初始自应力对钢管混凝土压弯力学性能的影响,对15根钢管自应力自密实混凝土柱和3根普通钢管自密实混凝土柱进行了偏心受压试验研究.结果表明:与普通钢管自密实混凝土相比,钢管自应力自密实混凝土具有较长的弹性工作段,其随偏心率和长细比的增加而略有下降;初始自应力的存在使核心混凝土在未加载前就处于三向应力状态下,从而显著提高了其密实度,最终使结构获得较高的偏心受压极限承载力;初始自应力对结构的破坏形态几乎没有影响.

Experimental research on self-stressing and self-compacting concrete filled steel tube subjected to eccentric compression load

A total of fifteen self-stressing and self-compacting concrete filled steel tube columns and three self-compacting concrete filled steel tube columns are tested under eccentric compression load to analyze the influence of initial self-stress on the compression behavior of the concrete filled steel tubes. The results show that the elastic working range of column is lengthened because of initial self-stress and it slightly decreases with the increase of load eccentricity ratio and slenderness ratio. Because of the initial self-stress, concrete core is always under compression in three directions, so the compactness is enhanced and the ultimate bearing capacity is increased obviously. But the initial self-stress hardly affects the failure mode of the columns.