为了研究形状记忆合金预应变条件对混凝土柱的影响,利用形状记忆合金的形状记忆效应,将含有预拉伸变形的形状记忆合金材料与混凝土材料组合在一起,制作成自适应功能的混凝土柱,通过对相同混凝土配合比的1组素混凝土柱,2组不同预应变形状记忆合金螺旋箍筋未驱动柱和2组不同预应变形状记忆合金螺旋箍筋驱动柱进行轴压试验,并对5组混凝土试件的力学性能进行了初步的试验研究,包括抗压强度、横向应变、纵向应变和裂缝出现时的荷载,分析了5组试件的变化规律。研究结果表明:驱动柱比未驱动柱的抗裂性能有较大提高;形状记忆合金箍筋预应变越大,施加的预应力就越大,抵抗变形的能力就越强;驱动柱与未驱动柱极限荷载几乎一致;驱动柱和未驱动柱都比素混凝土柱在极限荷载和抗裂性能方面有很大提高。
Abstract
In order to study the influence of pre-strain conditions on concrete columns confined with shape memory alloy(SMA), by using shape memory effect of SMA, pre-tensile deformation SMA was integrated with concrete materials to make concrete columns with adaptive capability. By testing on one group of plain concrete columns, two groups of different pre-strain un-actuated columns with SMA spiral reinforcement and two groups of different pre-strain actuated columns with SMA spiral reinforcement under axial loading, the preliminary research on the mechanical properties of concrete columns with the same mix proportion, including compressive strength, transverse strain and longitudinal strain, and cracking load, was conducted, and their variations were also analyzed. The results show that actuated columns enhance the anti-cracking ability, compared with un-actuated columns; pre-stress increases with pre-strain and the larger the pre-stress, the better the anti-cracking ability; the ultimate loads are almost the same for actuated and un-actuated column; crack resistance and ultimate load are both increased for them, compared with plain concrete column.
关键词
桥梁工程 /
形状记忆合金 /
轴压试验 /
驱动能力 /
螺旋箍筋 /
预应变
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Key words
bridge engineering /
shape memory alloy /
axial compression experiment /
actuating capability /
spiral reinforcement /
pre-strain
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中图分类号：
U444
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脚注
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基金
重庆市自然科学基金项目(CSTC05BB6116)
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