东南大学学报（自然科学版）2026，Vol.56Issue(3)：452-460,9.DOI:10.3969/j.issn.1001-0505.2026.03.014
高龄混凝土桥梁方形带肋钢筋疲劳性能试验研究
Experimental study on fatigue properties of square ribbed steel bars in aged concrete bridges
摘要
Abstract
To investigate the fatigue properties of square ribbed steel bars,based on a 86-year-old concrete bridge in Suzhou,high-cycle fatigue tests of 12 standard specimens and low-cycle fatigue tests of 8 standard specimens were conducted.The high-cycle and low-cycle fatigue properties of the square ribbed steel bars were determined by the fatigue failure loading cycles,stress-strain hysteretic curves,and low-cycle fatigue models.The experimental results indicate that the square ribbed steel bars can withstand over 10 million fa-tigue cycles under the tensile stress with a stress ratio of 0.2 and a stress range of 156 MPa,and over 2.5 mil-lion fatigue cycles under the tension-compression stress state with a stress ratio of-1.0 and a maximum stress of 195 MPa.When the loading strain range is 0.6%,the square ribbed steel bars exhibit continuous cyclic soft-ening behaviors,while they demonstrate brief cyclic softening behaviors followed by persistent cyclic harden-ing behaviors when the loading strain range exceeds 1.0%.The low-cycle fatigue properties of the square ribbed steel bars can be simulated by the modified Coffin-Manson model.The recommended values for the fa-tigue damage parameter,strength degradation parameter,and fatigue failure index are 0.283,0.449,and 0.396,respectively.关键词
混凝土桥梁/方形带肋钢筋/疲劳性能/高周疲劳试验/低周疲劳试验Key words
concrete bridge/square ribbed steel bar/fatigue property/high-cycle fatigue test/low-cycle fatigue test分类
交通工程引用本文复制引用
翟慕赛,陶怡然,刘可凡,王雨竹,陈建兵..高龄混凝土桥梁方形带肋钢筋疲劳性能试验研究[J].东南大学学报（自然科学版）,2026,56(3):452-460,9.基金项目
国家自然科学基金资助项目(51908395,52308160) （51908395,52308160）
江苏省自然科学基金资助项目(BK20190945) （BK20190945）
苏州市科技计划(基础研究)资助项目(SJC2023002). （基础研究）
