湖南大学学报（自然科学版）2026，Vol.53Issue(7)：116-128,13.DOI:10.16339/j.cnki.hdxbzkb.2026065
高温下及负载高温后1770级钢绞线力学性能研究
Study on mechanical properties of 1770 grade steel strand at high temperature and after high temperature loading
摘要
Abstract
In this study,the mechanical properties of 1770-grade steel strands at elevated temperature and after thermal exposure are systematically studied.The reduction coefficient and its fitting formula of the mechanical properties of steel strands under the two conditions are proposed.The tensile properties of steel strands in the temperature range of 20 to 600℃were tested by a non-contact XTDIC three-dimensional strain measurement system,and the variation rules of mechanical parameters such as yield strength,ultimate strength,elastic modulus,and strain were analyzed.The test results show that the mechanical properties of the steel strand change slightly and exhibit brittle failure at temperatures of 200℃and below.When the temperature reaches 300℃and above,the mechanical properties deteriorate significantly,and the plastic deformation increases gradually.At 600℃,the yield strength and ultimate strength are reduced to 9%of the normal temperature,and the elastic modulus is reduced to 10%.The steel strand almost completely loses its bearing capacity.Besides,the mechanical properties of steel strands after high-temperature loading are significantly affected by the initial stress level.Especially after the temperature reaches 400℃and above,the greater the initial stress of steel strands,the more obvious the degradation of mechanical properties.关键词
钢绞线/预应力/高温/力学性能/火灾安全Key words
steel strand/prestressing force/high temperature/mechanical properties/fire safety分类
建筑与水利引用本文复制引用
吴长,张凯凯,张娅琼,方仁俊,王熙..高温下及负载高温后1770级钢绞线力学性能研究[J].湖南大学学报（自然科学版）,2026,53(7):116-128,13.基金项目
国家自然科学基金资助项目(52268029),National Natural Science Foundation of China(52268029) （52268029）
