Seismic behavior of steel l-shaped special-shaped columns under cyclic loading

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2025-03-17 DOI:10.1016/j.tws.2025.113209

Yake Li , Jianyang Xue , Xunxiang Wang , Liangjie Qi , Qunshan Su , Qingwei Wang

{"title":"Seismic behavior of steel l-shaped special-shaped columns under cyclic loading","authors":"Yake Li , Jianyang Xue , Xunxiang Wang , Liangjie Qi , Qunshan Su , Qingwei Wang","doi":"10.1016/j.tws.2025.113209","DOIUrl":null,"url":null,"abstract":"<div><div>To assess the local buckling and its effect on hysteretic behavior of steel <span>l</span>-shaped special-shaped columns, and cyclic horizontal loading tests was conducted on six 2/3-scale columns to investigate the effects of loading angle, plate width-to-thickness ratio, and axial load ratio. The failure modes, hysteresis curves, skeleton curves, stiffness degradation, ductility, and energy dissipation capacity were analyzed. Numerical models incorporating initial geometric imperfections, residual stresses, and ductile damage were established and validated by the test results. Then, 163 numerical models were developed for an extensive parametric analysis using Python script, considering factors including loading angle, slenderness ratio, transverse stiffeners, flange width-to-thickness ratio, web height-to-thickness ratio, and axial load ratio. The results show that, compared to other loading angles, columns subjected to loading angles of 45° and 67.5° demonstrated higher strength (averaging up to 25 %), slower stiffness degradation (averaging up to 40 %), and better energy dissipation capacity (averaging up to 15 %). As the slenderness ratio increased from 35 to 67, the strength decreased by 3.54 %, and the initial stiffness decreased by a factor of 6. The addition of two sets of transverse stiffeners in the plastic hinge region resulted in an increase in columns strength of more than 6 %. Numerical analysis revealed a strong correlation between the degree of plastic development in the section and the axial load ratio. Based on these findings, the section classification of the column was discussed, and it was concluded that the section classification in Eurocode 3 is not rational for these columns.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"212 ","pages":"Article 113209"},"PeriodicalIF":5.7000,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Thin-Walled Structures","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0263823125003039","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CIVIL","Score":null,"Total":0}

引用次数: 0

Abstract

To assess the local buckling and its effect on hysteretic behavior of steel l-shaped special-shaped columns, and cyclic horizontal loading tests was conducted on six 2/3-scale columns to investigate the effects of loading angle, plate width-to-thickness ratio, and axial load ratio. The failure modes, hysteresis curves, skeleton curves, stiffness degradation, ductility, and energy dissipation capacity were analyzed. Numerical models incorporating initial geometric imperfections, residual stresses, and ductile damage were established and validated by the test results. Then, 163 numerical models were developed for an extensive parametric analysis using Python script, considering factors including loading angle, slenderness ratio, transverse stiffeners, flange width-to-thickness ratio, web height-to-thickness ratio, and axial load ratio. The results show that, compared to other loading angles, columns subjected to loading angles of 45° and 67.5° demonstrated higher strength (averaging up to 25 %), slower stiffness degradation (averaging up to 40 %), and better energy dissipation capacity (averaging up to 15 %). As the slenderness ratio increased from 35 to 67, the strength decreased by 3.54 %, and the initial stiffness decreased by a factor of 6. The addition of two sets of transverse stiffeners in the plastic hinge region resulted in an increase in columns strength of more than 6 %. Numerical analysis revealed a strong correlation between the degree of plastic development in the section and the axial load ratio. Based on these findings, the section classification of the column was discussed, and it was concluded that the section classification in Eurocode 3 is not rational for these columns.

查看原文本刊更多论文

求助全文

约1分钟内获得全文求助全文

来源期刊

Thin-Walled Structures 工程技术-工程：土木

CiteScore

9.60

自引率

20.30%

发文量

801

审稿时长

66 days

期刊介绍： Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.