Recycled aggregate concrete-filled steel tube columns with small-diameter circular FRP-confined sea-sand concrete cores: Conceptual and experimental investigations

被引：6

作者：

Zeng, Lan ^{[1
]}

Wu, Liqi ^{[2
]}

Li, Boqin ^{[1
]}

Fang, Shu ^{[3
]}

Mohamed, Hazem Samih ^{[4
]}

Fang, Zhuangcheng ^{[3
]}

Yuan, Hong ^{[1
,5
]}

机构：

[1] Jinan Univ, Sch Mech & Construct Engn, MOE Key Lab Disaster Forecast & Control Engn, Guangzhou 510632, Guangdong, Peoples R China

[2] Guangdong Architectural Design & Res Inst Co Ltd, Guangzhou 510006, Peoples R China

[3] Guangzhou Univ, Earthquake Engn Res & Test Ctr, Guangdong Key Lab Earthquake Engn & Appl Tech, Guangzhou 510006, Peoples R China

[4] Fujian Agr & Forestry Univ, Coll Transportat & Civil Engn, Fuzhou, Peoples R China

[5] Guangzhou Inst Sci & Technol, Sch Architectural Engn, Guangzhou 510540, Peoples R China

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2023年 / 401卷

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

Recycled aggregate concrete; Concrete-filled steel tube columns; Sea-sand concrete (SSC); Fiber-reinforced polymer (FRP)-confined; concrete core; Axial compressive performance; BEHAVIOR;

D O I：

10.1016/j.conbuildmat.2023.132853

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Recycled aggregate concrete (RAC) prepared from waste concrete can achieve the green recycling of resources; however, its inferior material properties hinder its applications. Sea-sand concrete (SSC) can help alleviate the resource shortage of fresh water and river sands but is prone to steel corrosion. To address these challenges, this study developed a new RAC-filled steel tube column with a small-diameter circular fibre-reinforced polymer (FRP)-confined SSC core. This paper presents and discusses the results of the axial compression tests conducted on RAC-filled steel tube columns, with and without small-diameter circular FRP-confined SSC cores. The study investigated the effects of the configuration of the FRP-confined SSC core, diameter-to-thickness ratio of the FRP tubes, compressive strength of RAC and SSC, and cross-sectional shape of the column. The results revealed that using small-diameter circular FRP-confined SSC cores to partially replace RAC was effective in improving the compressive performance of RAC-filled steel tube columns. The increase in the number of FRP tubes, in-filled concrete strength, and confinement stiffness of the steel and FRP tubes contributed to improvements in the structural strength and ductility, resulting in progressive ladder-shaped declines in the post-peak curve. Finally, a reasonable load-capacity model is presented for the proposed columns.

引用

页数：12

共 36 条

[11] Compressive behavior of small-diameter concrete-filled fiber-reinforced polymer tubes as internal reinforcements [J].