形状记忆合金对混凝土梁驱动效应的有限元分析

Analysis for actuating effects of embeded shape memory alloy in reinforced concrete beam with ANSYS

将常温下为马氏体状态的Ni Ti形状记忆合金预拉伸到产生塑性变形后,再把其偏心埋置于钢筋混凝土梁中,利用SMA特殊的形状记忆效应,通过加热合金丝使其发生马氏体逆相变从而产生巨大的恢复力来驱动钢筋混凝土梁。本文运用通用有限元计算软件ANSYS进行了建模和分析,结果证明可以利用SMA对混凝土梁施加较大的预应力,提高梁的强度和刚度,从而实现变形的主动控制。

In normal temperature, Ni-Ti shape memory alloys (SMA) wires were elongated beyond their plastic limit and were eccentrically embedded in reinforced concrete beam. By using especial shape memory effects of SMA, and heating the alloys, a martensite-to-austenite phase transformation takes place and the material undergoes large shrinkage strains, the concrete beam will be actuated. In this thesis, finite element program ANSYS was used to simulate the concrete beam precisely. The study showed that SMA can be utilized to induce additional prestress in concrete, to enhance the intensity and rigidity, and finally to realize the active control.