The memory effect of shape-memory alloys (SMAs) has opened interesting perspectives to create prestress states in concrete elements. However, the procedure has not been yet fully resolved due to the complex thermomechanical behavior of these alloys, in addition to the practical difficulties of mechanical coupling between SMA and concrete elements. The present study deals with tests on the development of prestressing forces in concrete beams during the thermal cycle required in the procedure. Pre-stretched nickel–titanium wires were externally placed on concrete prismatic beams equipped with strain gauges. As concrete rupture may occur during the heating by the Joule effect, a compromise must be found between the SMA pre-stretch level and the maximum temperature to be applied before returning to ambient temperature. A macroscopic model was developed to analyze this compromise. The complex thermomechanical response of SMAs implies a particular attention in the definition of the ambient temperature and heating conditions for the creation of prestress states in concrete components.

形状记忆合金（SMA）的记忆效应为在混凝土元素中创建预应力状态开辟了有趣的视角。但是，由于这些合金的复杂热机械性能，以及SMA和混凝土元件之间机械耦合的实际困难，该程序尚未完全解决。本研究涉及过程中所需的热循环过程中混凝土梁中预应力的发展。将预拉伸的镍钛丝从外部放置在配有应变仪的混凝土棱柱上。由于在焦耳效应的加热过程中可能会发生混凝土破裂，因此必须在SMA预拉伸水平和恢复至环境温度之前施加的最高温度之间找到折衷方案。开发了宏观模型来分析这种折衷。SMA的复杂热机械响应意味着在环境温度和加热条件的定义中要特别注意，以便在混凝土组件中创建预应力状态。