Experimental Study on Local Buckling Behavior of 7075-T6 High-Strength Aluminum Alloy Beams

被引：0

作者：

Lu, Huan ^{[1
]}

Wang, Yuanqing ^{[1
]}

Zhi, Xinhang ^{[1
]}

Fan, Shenggang ^{[2
]}

Chen, Boshan ^{[1
]}

Ouyang, Yuanwen ^{[3
,4
]}

机构：

[1] Key Laboratory of Civil Engineering Safety and Durability of Ministry of Education, Tsinghua University, Beijing

[2] Key Laboratory of Concrete and Prestressed Concrete of Ministry of Education, Southeast University, Nanjing

[3] Shanghai Tongzheng Aluminum Structure Construction & Technology Co.，Ltd., Shanghai

[4] Shanghai Jianke Aluminum Structure & Architecture Research Institute, Shanghai

来源：

Tianjin Daxue Xuebao (Ziran Kexue yu Gongcheng Jishu Ban)/Journal of Tianjin University Science and Technology | 2024年 / 57卷 / 12期

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

beam; experimental study; high-strength aluminum alloy; local buckling behavior;

D O I：

10.11784/tdxbz202311016

中图分类号：

学科分类号：

摘要：

To study the local buckling behavior of high-strength aluminum alloy beams in structural engineering and promote the actual applications of high-strength aluminum alloy，local buckling tests were carried out on seven 7075-T6 aluminum alloy H-section beams，including four specimens with mid-span stiffeners and three specimens without mid-span stiffeners. The material and mechanical properties of 7075-T6 aluminum alloy and the initial local geometric imperfections of specimens were measured，and the failure modes，ultimate loads，critical local buckling loads and load-vertical displacement curves for specimens at mid-span were analyzed in detail. Test results indicated that the average nominal yield strength of 7075-T6 aluminum alloy reached approximately 497 MPa，and the mean values of initial local geometric imperfection amplitude ratios of flanges and webs were 0.40% and 0.10%，respectively. The four specimens with mid-span stiffeners failed by shear buckling，and a tension field was formed. In comparison，the three specimens without mid-span stiffeners failed by web crippling，and the web of them bulged. The critical local buckling loads were determined using a strain reversal method，and it was found that both the ratio of section utilization and the stress level during buckling decreased with an increase in the ratio of width-to-thickness of the web. The layout of mid-span stiffeners can greatly improve the ultimate loads and ductility of members. In addition，test results were utilized to compare the ultimate loads of bending members calculated by design methods proposed in the existing European standard(EN 1999-1-1: 2007 Eurocode 9)，American standard (Aluminum Design Manual 2020) and Chinese standard (GB 50429—2007). The mean values of ratios of results calculated using the three standards to test results were 0.717，0.682 and 0.498，respectively，indicating that the three standards offer conservative predictions while the European standard provides the most accurate prediction. © 2024 Tianjin University. All rights reserved.

引用

页码：1245 / 1254

页数：9

共 30 条

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