Strengthening Concrete Structures with Smart Materials

钢筋混凝土（RC）结构的恶化是一个永无止境的问题，激励着世界各地的土木工程师寻求创新的耐用加固技术和高性能的先进材料。最近，一类新的智能材料形状记忆合金（SMA）因其优异的性能而引起了不同领域研究人员的关注。SMA是一类独特的合金，具有承受大变形并通过消除应力恢复其原始形状的能力。除了具有超弹性、耐蚀性和疲劳电阻性外，sma的主要特点是其独特的热机械性能所继承的形状记忆效应（SME）现象。SME表示sma在加热后变形超过弹性极限后恢复其原始形状的能力。具有SME特性的sma可以作为外部预应力钢筋，为RC构件提供主动加固。

Deterioration of Reinforced Concrete (RC) structures is a never-ending problem that incites civil engineers around the world to seek innovative durable strengthening techniques and high performance advanced materials. Recently, a new class of smart materials called Shape Memory Alloys (SMA) has been attracting the attention of researchers from different fields due to their superior properties. The SMA is a unique class of alloy with the ability to undergo large deformations and return to its original shape through stress removal. Besides their super-elasticity, corrosion and fatigue resistivity, SMAs are mainly characterized by the Shape Memory Effect (SME) phenomenon that is inherited through their unique thermo-mechanical properties. The SME represents the ability of the SMAs to recover their original shape after being deformed beyond the elastic limits upon heating. SMAs with the SME property can be used as external prestressed reinforcement by providing active strengthening to RC members.