[1]俞昊然,李维滨,成维佳.含有焊缝初始裂纹的钢框架梁柱节点性能试验研究[J].东南大学学报(自然科学版),2020,50(3):409-416.[doi:10.3969/j.issn.1001-0505.2020.03.001]
 Yu Haoran,Li Weibin,Cheng Weijia.Experimental study on behaviors of steel frame beam-column connections with initial weld cracks[J].Journal of Southeast University (Natural Science Edition),2020,50(3):409-416.[doi:10.3969/j.issn.1001-0505.2020.03.001]
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含有焊缝初始裂纹的钢框架梁柱节点性能试验研究()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
50
期数:
2020年第3期
页码:
409-416
栏目:
材料科学与工程
出版日期:
2020-05-20

文章信息/Info

Title:
Experimental study on behaviors of steel frame beam-column connections with initial weld cracks
作者:
俞昊然李维滨成维佳
东南大学混凝土及预应力混凝土结构教育部重点实验室, 南京 211189; 东南大学土木工程学院, 南京 211189
Author(s):
Yu Haoran Li Weibin Cheng Weijia
Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 211189, China
School of Civil Engineering, Southeast University, Nanjing 211189, China
关键词:
钢框架节点 初始裂纹 裂纹扩展 拟静力试验 抗震性能
Keywords:
steel frame connection initial crack crack propagation pseudo-static test seismic behavior
分类号:
TU502.6
DOI:
10.3969/j.issn.1001-0505.2020.03.001
摘要:
为研究焊缝初始裂纹对钢框架梁柱节点抗震性能的影响,通过切割节点的梁下翼缘焊缝以形成初始裂纹,完成了7个节点拟静力试验,并分析了能量输入历程与节点连接形式对其性能的影响.试验结果表明,含有初始裂纹的节点试件SHH-1从启裂至破坏共经历了6个循环,相比于无损节点试件SHH-0持续时间减少25%,极限荷载降低8.5%,极限位移与延性系数均降低26%.节点中梁下翼缘焊缝部位若存在初始裂纹,会改变节点的裂纹扩展机理,其抗震性能也会明显降低.当加载跨幅相同且循环次数相差不大时,不同的加载制度对初始裂纹扩展机理及节点抗震性能影响较小,但突增式位移荷载会加速裂纹的扩展.H形柱-H形梁节点初始裂纹扩展速度相对最慢、抗震性能最好,其次为箱形柱-H形梁节点,箱形柱-箱形梁节点性能最差.
Abstract:
To study the effect of the initial cracks at welds on the seismic behaviors of a steel frame beam-column connection, the weld of the beam bottom flange was cut to create an initial crack, and the pseudo-static tests of seven connections were carried out. The influences of the energy input process and the connection types on its performance were analyzed. The results show that the specimen SHH-1 with the initial crack experiences six cycles from the new crack appearance to the failure. Compared with the specimen SHH-0 without any initial crack, the loading duration, the ultimate load, the ultimate displacement and the ductility coefficients of SHH-1 were reduced by 25%, 8.5%, 26%, and 26%, respectively. The crack propagation mechanism can be changed by the initial crack at the weld of a bottom beam flange, and the seismic performance of the connection can be significantly reduced. When the load spans are the same and there is little difference of the cycle numbers, different loading systems have little influence on the initial crack propagation and the connection performance, but a sudden peak load can increase the speed of the connection failure. The H-shaped beam to H-shaped column connections have the slowest initial crack growth and the best seismic performance, followed by the H-shaped beam to box column connections, and the box beam to box column connections have the worst performance.

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备注/Memo

备注/Memo:
收稿日期: 2019-12-15.
作者简介: 俞昊然(1992—),男,博士生;李维滨(联系人),男,博士,教授,博士生导师,liwbliwb@163.com.
基金项目: 国家自然科学基金资助项目(51778143)、江苏高校优势学科建设工程资助项目(CE02-1-51).
引用本文: 俞昊然,李维滨,成维佳.含有焊缝初始裂纹的钢框架梁柱节点性能试验研究[J].东南大学学报(自然科学版),2020,50(3):409-416. DOI:10.3969/j.issn.1001-0505.2020.03.001.
更新日期/Last Update: 2020-05-20