Anchorage strength of stainless steel T-bolt in square concrete-filled stainless steel tubes

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL Thin-Walled Structures Pub Date : 2025-03-04 DOI:10.1016/j.tws.2025.113155

Ying-Lei Li , Min Lei , Xiao-Ling Zhao

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Abstract

A stainless steel T-bolt was proposed to achieve one-side access joints for concrete-filled steel tubular structures. This paper presents an experimental and theoretical study on the anchorage behavior of a single stainless steel T-bolt embedded in square thin-walled concrete-filled stainless steel tubes (CFSSTs). Pullout test was conducted on a total of 47 specimens, including single-head T-bolt in CFSST, double-head T-bolt in CFSST, single-head T-bolt in square hollow tube (SHS), and single-head T-bolt in plain concrete. Failure modes, load-displacement curves, and anchorage strength were obtained from the experiments. Key parameters affecting anchorage strength were examined, including anchorage depth, tube thickness, concrete grade, anchor size, bolt position, and bolt type. Theoretical analysis was then conducted to identify the force transfer mechanisms in specimens and design formulas were proposed to predict the anchorage strength of T-bolts in CFSSTs. The predictions were in good agreement with the experimental results, demonstrating the reasonability of the proposed theoretical models.

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不锈钢 T 型螺栓在方形混凝土填充不锈钢管中的锚固强度

有人提出用不锈钢 T 型螺栓实现混凝土填充钢管结构的单侧接入连接。本文对嵌入方形薄壁混凝土填充不锈钢管（CFSST）中的单个不锈钢 T 型螺栓的锚固行为进行了实验和理论研究。共对 47 个试件进行了拉拔试验，包括 CFSST 中的单头 T 型螺栓、CFSST 中的双头 T 型螺栓、方形空心管（SHS）中的单头 T 型螺栓和素混凝土中的单头 T 型螺栓。实验得出了失效模式、荷载-位移曲线和锚固强度。研究了影响锚固强度的关键参数，包括锚固深度、管子厚度、混凝土等级、锚固尺寸、螺栓位置和螺栓类型。然后进行了理论分析，以确定试样中的力传递机制，并提出了设计公式来预测 CFSST 中 T 型螺栓的锚固强度。预测结果与实验结果十分吻合，证明了所提理论模型的合理性。

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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.