Experimental and theoretical analysis of L-shaped partially encased thin-walled steel-concrete composite columns under axial compression

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2025-01-22 DOI:10.1016/j.tws.2025.112961

Jingfeng Wang , Qiuyu Xu , Yong Liu , Weidong He , Jingyi Wang , Beibei Li

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引用次数: 0

Abstract

Due to the advantages of aesthetic appeal and simplicity in construction, l-shaped partially encased thin-walled steel-concrete composite (thin-walled LPEC) columns present broad prospects in engineering applications. This study presented experimental and theoretical analysis of thin-walled LPEC stub columns under axial compression. The axial test revealed the axial failure modes of thin-walled LPEC columns: spalling and local crushing of concrete and local buckling of flanges. The parametric analysis showed that as the steel component thickness and steel yield strength increased, the transverse link spacing and limb height-to-thickness ratio decreased, the confinement of steel component and transverse links on the concrete was improved. Based on the axial stress state of the concrete, the concrete area was classified into un-effectively weakly confined, effectively weakly confined and strongly confined regions. A calculation method considering the influence of transverse link spacing and limb height-to-thickness ratio was proposed for calculating the concrete area in each region. According to the strain compatibility and interfacial interactions, a calculation model for lateral confining stress in concrete under peak load was constructed. The calculation method for the strength of confined concrete and the axial compression bearing capacity of thin-walled LPEC stub columns were proposed. The calculation results aligned well with the existing experimental and FE analysis results. This research lays a foundation for further exploration and application of thin-walled LPEC columns.

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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.