东南大学学报（自然科学版）2025，Vol.55Issue(4)：975-981,7.DOI:10.3969/j.issn.1001-0505.2025.04.006
低松弛钢绞线条件屈服点取值及本构模型分析
Analysis on proof stress and constitutive models of low-relaxation prestressing strands
摘要
Abstract
The proof stress of low-relaxation prestressing strands is the turning point to hardening stage after yielding,and its value affects the nonlinear constitutive model and the long-term behaviors of prestressed con-crete bridges.Firstly,the differences in the proof stress and yield strength ratio of low-relaxation prestressing strands in the relevant specifications in China,the United States,and Europe are compared.Secondly,based on the general formula of the Giuffrè-Menegotto-Pinto(GMP)constitutive model for steel strands,the full curve equation of the constitutive model of low-relaxation prestressing strands is established using the defini-tion of the proof stress in the specifications in China,the United States,and Europe.The residual strain near the proof stress significantly increases nonlinearly.Furthermore,based on the constitutive model,the residual strains of low-relaxation prestressing strands meeting these three specifications are calculated under the tension control stress and relaxation test stress levels.In addition,a normal distribution model for the strength and proof stress of low-relaxation prestressing strands established by relevant foreign experiments is proposed.Fi-nally,suggestions are made for improving the proof stress of low-relaxation prestressing strands in Chinese specifications,and the necessity of conducting long-term relaxation loss tests is discussed.关键词
低松弛钢绞线/条件屈服点/钢绞线非线性本构/钢绞线松弛Key words
low-relaxation prestressing strands/proof stress/nonlinear constitutive behavior of prestressing strands/relaxation of prestressing strands分类
交通工程引用本文复制引用
刘钊,王羿..低松弛钢绞线条件屈服点取值及本构模型分析[J].东南大学学报（自然科学版）,2025,55(4):975-981,7.基金项目
国家重点研发计划资助项目(2019YFE0119800). （2019YFE0119800）
