930 MPa级大直径高强冷滚压螺纹预应力钢筋<i>S</i>-<i>N</i>曲线研究

李宇欢; 常好诵; 傅彦青; 任志宽; 常海林

doi:10.3724/j.gyjzG23111502

930 MPa级大直径高强冷滚压螺纹预应力钢筋S-N曲线研究

doi: 10.3724/j.gyjzG23111502

李宇欢^1,3,
常好诵^1,2,
傅彦青^1,2,3, ,,
任志宽^1,2,
常海林^1,2

1. 中冶检测认证有限公司, 北京 100088;
2. 中冶建筑研究总院有限公司, 北京 100088;
3. 西南交通大学土木工程学院, 成都 610031

基金项目:

国家自然科学基金项目(52078508)；国家重点研发计划课题(2022YFB3706403)。

详细信息

作者简介:
李宇欢,工程硕士,助理工程师,主要从事高性能钢材疲劳性能研究,804226768@qq.com。

通讯作者:
傅彦青,191607093@qq.com。

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出版历程
- 收稿日期: 2023-11-15
- 网络出版日期: 2024-02-27

Research on S-N Curves of 930 MPa Large-Diameter High-Strength Cold-Rolled Threaded Prestressed Steel Rebars

LI Yuhuan^1,3,
CHANG Haosong^1,2,
FU Yanqing^{1,2,3
, ,},
REN Zhikuan^1,2,
CHANG Hailin^1,2

1. Inspection and Certification Co. MCC, Beijing 100088, China;
2. Central Research Institute of Building and Construction Co. MCC Group, Beijing 100088, China;
3. School of Civil Engineering Southwest Jiaotong University, Chengdu 610031, China

摘要

摘要: 考虑大直径钢筋横截面材料不均匀问题及钢筋螺纹根部应力集中,对930 MPa级的75 mm直径高强冷滚压螺纹预应力钢筋横截面不同位置材料开展了单轴拉伸及疲劳性能试验研究,并对全尺寸钢筋进行单轴拉伸有限元数值模拟,以分析螺纹根部应力集中,基于计算结果及疲劳试验数据,修正得到了适用于930 MPa级75 mm直径高强冷滚压螺纹预应力钢筋的S-N曲线。结果表明：大直径高强冷滚压螺纹预应力钢筋单轴拉伸应力-应变曲线无屈服平台,930 MPa级的75 mm直径钢筋横截面材性存在显著差异；螺纹根部存在明显的应力集中,应力集中系数约为1.74；平均应力为700 MPa时,其疲劳性能与GB 50017—2017《钢结构设计标准》中考虑尺寸效应的Z11曲线接近。
- 冷滚压螺纹 /
- 大直径预应力钢筋 /
- 力学特性 /
- 应力集中 /
- 疲劳性能
Abstract: Considering the problem of uneven cross-section of material of large-diameter steel rebars and the stress concentration at the root of thread rebars, the paper carried out an experimental study of uniaxial tensile and fatigue properties of materials at different positions of the cross-section of 930 MPa grade 75 mm diameter high-strength cold-rolled threaded prestressed steel rebars, and carried out a finite element numerical simulation of full-size steel rebars under uniaxial tensile to analyze the stress concentration at the thread root. The results showed that there was no yield platform in the stress-strain curves of large-diameter high-strength cold-rolled threaded prestressed steel rebars under uniaxial tensile, and there were significant differences in the cross-sectional material properties of the 930 MPa grade 75 mm diameter steel rebars. There was an obvious stress concentration at the thread root, and the stress concentration coefficient was about 1.74, and the fatigue properties was very close to the Z11 curve considering the size effect in the Steel Structure Design Standard (GB 50017—2017) when the average stress was 700 MPa.
- cold-rolled threads /
- large-diameter prestressed steel rebars /
- mechanical properties /
- stress concentration /
- fatigue properties

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