Novel concrete-filled steel square tubular columns stiffened with semi-circles: Concept and behaviour

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2025-03-09 DOI:10.1016/j.tws.2025.113188

Shuai Li , Faqi Liu , Tak-Ming Chan , Hua Yang , Ben Young

{"title":"Novel concrete-filled steel square tubular columns stiffened with semi-circles: Concept and behaviour","authors":"Shuai Li , Faqi Liu , Tak-Ming Chan , Hua Yang , Ben Young","doi":"10.1016/j.tws.2025.113188","DOIUrl":null,"url":null,"abstract":"<div><div>A novel concrete-filled steel tubular (CFST) column with semi-circular stiffeners welded in the inner side of the square tube is proposed in this study. The semi-circular stiffeners are developed based on the confinement mechanism in square CFST columns and aim to strengthen the confinement effect on concrete in the whole cross-section area, therefore improving the overall structural performance of the composite columns. The section is also flexible to use different grades of concrete in the core and cell regions. Experimental investigation on axial compressive behaviour of the semi-circle stiffened concrete-filled steel tubular (SCS-CFST) columns was carried out. High strength steel Q690 and two concrete grades C40 and C90 were adopted for the test specimens. Various parameters including steel tube thickness, cross-section slenderness, combination of different concrete grades as well as semi-circular stiffener size were investigated. Results showed that the semi-circular stiffeners were effective resist local buckling of the square tubes. SCS-CFST columns, particularly for those with C40 infilled in the core region and C90 infilled in the cell regions, presented significantly enhanced compressive strength and ductility compared to the corresponding normal unstiffened CFST columns. The applicability of existing design equations in European, American and Chinese standards was evaluated for the novel SCS-CFST columns. A new design approach that could more accurately consider the confinement effect in different regions was proposed and exhibited good performance.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"212 ","pages":"Article 113188"},"PeriodicalIF":5.7000,"publicationDate":"2025-03-09","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/S0263823125002824","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

A novel concrete-filled steel tubular (CFST) column with semi-circular stiffeners welded in the inner side of the square tube is proposed in this study. The semi-circular stiffeners are developed based on the confinement mechanism in square CFST columns and aim to strengthen the confinement effect on concrete in the whole cross-section area, therefore improving the overall structural performance of the composite columns. The section is also flexible to use different grades of concrete in the core and cell regions. Experimental investigation on axial compressive behaviour of the semi-circle stiffened concrete-filled steel tubular (SCS-CFST) columns was carried out. High strength steel Q690 and two concrete grades C40 and C90 were adopted for the test specimens. Various parameters including steel tube thickness, cross-section slenderness, combination of different concrete grades as well as semi-circular stiffener size were investigated. Results showed that the semi-circular stiffeners were effective resist local buckling of the square tubes. SCS-CFST columns, particularly for those with C40 infilled in the core region and C90 infilled in the cell regions, presented significantly enhanced compressive strength and ductility compared to the corresponding normal unstiffened CFST columns. The applicability of existing design equations in European, American and Chinese standards was evaluated for the novel SCS-CFST columns. A new design approach that could more accurately consider the confinement effect in different regions was proposed and exhibited good performance.

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.