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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

38卷

期数:

2021年05期

页码:

56-65

栏目:

出版日期:

2021-09-15

文章信息/Info

Title:

Experimental Research on Post-fire Fracture Failure of Q690D Steel Cross-shaped Welded Joints

文章编号:

1673-2049(2021)05-0056-10

作者:

黄学伟,张潇舸,魏晨晨,赵 军,葛建舟

(郑州大学 力学与安全工程学院,河南 郑州 450001)

Author(s):

HUANG Xue-wei, ZHANG Xiao-ge, WEI Chen-chen, ZHAO Jun, GE Jian-zhou

(School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China)

关键词:

Q690D钢材;  高温;  试验研究;  断裂破坏;  焊接节点;  超低周疲劳

Keywords:

Q690D steel;  high temperature;  experimental research;  fracture failure;  welded joint;  ultra low cycle fatigue

分类号:

TU391

DOI:

10.19815/j.jace.2021.01051

文献标志码:

A

摘要:

为研究Q690D高强度钢材及焊缝连接件在常温和高温后的断裂性能,选取代表实际梁柱节点局部焊接构造的十字形焊接节点试样,完成了常温和一系列高温后Q690D钢材和ER80-G焊缝金属的单轴拉伸试验,得到了钢材和焊缝金属在不同高温后的弹性模量、屈服强度、极限强度和延伸率。开展了常温和高温后十字形焊接接头的单调拉伸试验和超低周循环试验,研究了Q690D高强度焊接接头的断裂机理,探讨了过火温度、加载制度对焊接接头断裂性能的影响。结果表明:当钢材和焊接接头的过火温度高于600 ℃时,钢材和十字形焊接接头的强度降低,其变形能力开始增大; 800 ℃高温后Q690D钢材的强度降低,但ER80-G焊缝金属的力学性能无明显变化,导致焊接接头经受800 ℃高温后,在单调荷载作用下,其断裂破坏未发生在焊缝处,而发生在母材位置; 循环荷载作用下焊接接头的承载能力和变形能力都低于单调荷载的情况; 试验得到钢材、焊缝金属和焊接接头的力学性能指标,为发展考虑火灾后效应的断裂分析模型提供了基础试验数据。

Abstract:

In order to study the fracture properties of Q690D high strength steel and welded joints at room temperature and after high temperature, the cross-shaped welded joints representing the actual local welding structure of the beam-to-column joints were selected, and a series of uniaxial tensile tests of Q690D steel and ER80-G weld metal at room temperature and after high temperature were conducted. The elastic modulus, yield strength, ultimate strength and elongation of steel and weld metal after high temperatures were obtained. The cross-shaped welded joints at room temperature and after high temperature were tested under monotonic loading and ultra low cyclic loading. The fracture mechanism of Q690D high strength welded joints was analyzed while the effect of post-fire temperature and loading condition on the fracture behavior of steel and welded joints was discussed. The results show that when the temperature is higher than 600 ℃, the post-fire strength of steel and welded joints decreases and the post-fire deformability increases. The strength of Q690D steel decreases after 800 ℃ high temperature, but the mechanical properties of ER80-G weld metal do not change obviously, causing the result that fracture failure of welded joint does not occur at the weld but at the base metal under monotonic loading after 800 ℃ high temperature. The bearing capacity and deformation capacity of welded joints under cyclic loading are lower than those under monotonic loading. The mechanical properties of steel, weld metal as well as the welded joints obtained from the tests are able to provide basic test data to develop fracture analysis models considering the post-fire effect.

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备注/Memo

备注/Memo:

收稿日期:2021-01-22
基金项目:国家自然科学基金项目(51608487); 郑州大学国家级大学生创新创业训练计划项目(202010459072); 河南省科技攻关项目(192102310221)
作者简介:黄学伟(1985-),男,安徽亳州人,副教授,工学博士,博士后,E-mail:huangxw@zzu.edu.cn。

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更新日期/Last Update: 2021-09-01