630MPa超高强钢筋低周疲劳性能试验研究  

Experimental study on low cycle fatigue properties of 630 MPa super-high strength steel bar

作　　者：孙传智[1] 缪长青[2] 李爱群[2,3] 乔燕[1] SUN Chuanzhi;MIAO Changqing;LI Aiqun;QIAO Yan(School of Civil Engineering and Architecture,Suqian College,Suqian 223800,China;School of Civil Engineering,Southeast University,Nanjing 210096,China;Beijing University of Civil Engineering and Architecture,Beijing 100044,China)

机构地区：[1]宿迁学院建筑工程学院,江苏宿迁223800 [2]东南大学土木工程学院,江苏南京210096 [3]北京建筑大学,北京100044

出　　处：《建筑结构学报》2021年第4期194-202,共9页Journal of Building Structures

基　　金：国家自然科学基金项目(51778135),2020年江苏省第五期“333工程”科研项目(BRA2020243);2020年宿迁市自然基金项目,2017年宿迁市千名拔尖人才培养工程第二层次培养对象项目。

摘　　要：630 MPa超高强钢筋已应用于实际工程,而目前针对国产630 MPa超高强钢筋的低周疲劳性能研究尚未见报道。为此,以我国国产630 MPa超高强钢筋为研究对象,对其进行了静力拉伸试验,得到其静拉力学性能参数。通过恒应变幅加载低周疲劳试验,得到疲劳寿命、循环响应特征及应力-应变滞回曲线等指标,研究了630 MPa超高强钢筋的疲劳性能,进行了低周疲劳特性评价。在试验研究的基础上,得到了630 MPa超高强钢筋疲劳性能参数,建立了其疲劳寿命预测公式。采用OpenSees软件进行了630 MPa超高强钢筋材料低周疲劳试验数值模拟,分析表明利用得到的超高强钢筋疲劳性能参数可以较精确地进行630 MPa超高强钢筋低周疲劳数值模拟。The 630 MPa super-high strength steel bar has been applied to practical engineering, but there is no research report on the low cycle fatigue performance of 630 MPa super-high strength steel bar at present. Firstly, 630 MPa super-high strength steel bars made in China were introduced, and the static tensile test of 630 MPa super-high strength steel bar was carried out to obtain its static mechanical performance parameters. Then the low cycle fatigue test under constant strain amplitude was performed, and the fatigue characteristics of 630 MPa super-high strength steel bar were investigated through indices of fatigue life, cyclic response characteristics and stress-strain hysteretic curves, etc. Based on experimental research, the fatigue performance parameters of 630 MPa super-high strength steel bar were obtained, and the fatigue life prediction formula was established. Finally, the OpenSees software was used to simulate low cycle fatigue test of 630 MPa super-high strength steel bar. The results show that the fatigue performance parameters of 630 MPa super-high strength steel bar obtained from test can be used for numerical simulation.

关 键 词：630 MPa超高强钢筋 疲劳参数 低周疲劳试验 数值模拟 疲劳性能 

分 类 号：TU375[建筑科学—结构工程] TU511.32