基于铁基形状记忆合金的新型预应力技术及其工程应用  

New prestressing technology based on iron-based shape memory alloys and its application in engineering

作　　者：朱虹[1,2] 刘子卿 董志强[1,2] 吴刚[1,2] 文玉华[3] Zhu Hong;Liu Ziqing;Dong Zhiqiang;Wu Gang;Wen Yuhua(Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education,Southeast University,Nanjing 211189,China;National and Local Joint Engineering Research Center for Intelligent Construction and Maintenance,Southeast University,Nanjing 211189,China;School of Mechanical Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,南京211189 [2]东南大学智慧建造与运维国家地方联合工程研究中心,南京211189 [3]四川大学机械工程学院,成都610065

出　　处：《东南大学学报（自然科学版）》2022年第2期402-416,共15页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51838004,51908118,52078127);江苏省自然科学基金资助项目(BK20190369);东南大学“至善青年学者”支持计划资助项目。

摘　　要：梳理了国内外关于铁基形状记忆合金的最新研究进展,介绍了铁基形状记忆合金的形状记忆效应、回复应力、耐腐蚀性和可焊性等基本特性,对利用其开展预应力加固的效果、关键工艺工法和长期性能等进行了总结.研究表明,新型铁基形状记忆合金可在160℃下产生约440 MPa的回复应力,并具有良好的耐腐蚀性能和焊接性能.铁基形状记忆合金产生的回复应力能够以主动预应力的形式施加到结构中,达到提高承载力、延性以及抗疲劳能力的效果.作为一种新的预应力材料,铁基形状记忆合金已以嵌入、体外加固形式应用于多项工程实际中.铁基形状记忆合金自预应力技术在未来工程结构全链条智慧运维中具有广阔的应用前景.The latest research progress on iron-based shape memory alloys at home and abroad was reviewed, and the basic properties of iron-based shape memory alloys, such as shape memory effect, recovery stress, corrosion resistance and weldability, were introduced. The strengthening effect, key method and long-term performance of prestressing with iron-base shape memory alloy were summarized. The research results show that the new iron-based shape memory alloy can generate recovery stress of about 440 MPa at 160 ℃, and has good corrosion resistance and welding properties. The recovery stress generated by iron-based shape memory alloys can be applied to the structure in the form of active prestressing, resulting in increased bearing capacity, ductility and fatigue resistance. As a new prestressing material, iron-based shape memory alloys have been used in many foreign countries in the form of near-surface-mounted and external prestressed. The self-prestressing technology based on iron-based shape memory alloys has broad application prospects in the future for intelligent operation and maintenance of the entire chain of engineering structures.

关 键 词：铁基形状记忆合金 形状记忆效应 回复应力 新型预应力技术 智慧运维 

分 类 号：TU511.38[建筑科学—建筑技术科学]