SMA对混凝土裂纹修复性能的数值分析

Numerical Analysis of Recovery Performance of Concrete Cracks by SMA

针对含有形状记忆合金(SMA)的混凝土试件进行了数值仿真分析。将SMA在温度变化下产生的驱动力转化来的预应力施加在SMA上,并将SMA作为主筋埋入混凝土梁中,通过调整混凝土型号、裂纹尺寸及位置、SMA直径、温度等,得出了不同因变量下SMA对混凝土裂纹修复性能较为全面的仿真结果。结果表明:SMA对所有的参变量下的裂纹修复尺寸均呈现了一致的线性变化,其中影响裂缝修复效果最强烈的是混凝土型号。影响最弱的是SMA自身直径。

The numerical simulation analysis was carried out for concrete samples containing SMA.The prestress transformed by the driving force of SMA under the temperature variation is applied to SMA,and SMA is embedded in the concrete beam as the main bar.By adjusting the concrete model,crack size and position,SMA diameter and temperature,etc.,the more comprehensive simulation results of the recovery performance of the concrete cracks by SMA under different variables are obtained.The results show that：SMA shows a uniform linear change in the size of crack recovery under all parameters,and the strongest influence on the crack recovery effect is the concrete model.The weakest influence is SMA diameter.