Scholarlink

<p>This study investigates the axial compression behavior of geopolymer concrete-filled unplasticized polyvinyl chloride tubes (GPCFUPVCT). A total of 54 cylindrical specimens were tested, including 18 unconfined specimens and 36 GPCFUPVCT specimens. The study examines the influence of concrete infill strength (ranging from 20 to 42 MPa), testing age (7, 28, and 90 days), and UPVC tube thickness (4.8 mm and 7.6 mm) on ultimate strength, ductility, and confinement effectiveness. Results show that increasing concrete strength and testing age led to reduced confinement effectiveness, while greater tube thickness improved confinement performance. To assess the predictive capabilities of existing design standards, eight international codes including AISC, EC4, AS/NZS, AIJ, GB, CSA, AASHTO, and ACI were evaluated using both the experimental data from this study and a comprehensive database of 523 CFTT columns reported in the literature. While these codes provide equations for concrete-filled steel tubes, none specifically address CFTTs. Despite the wide variability in experimental data, all codes yielded reasonably accurate predictions. Among them, EC4 and AS/NZS demonstrated the highest accuracy, whereas ACI 318 showed greater scatter in comparison with the experimental results. Based on these findings and guided by the AS/NZS code, a new design equation for predicting the axial load capacity of CFTTs is proposed, showing strong agreement with experimental data.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Performance of Eco-Friendly Concrete-Filled Unplasticized Polyvinyl Chloride Tubes Under Axial Compression

  • 期刊论文

  • 发表日期：

    2025年8月26日

查看全文
  • Ali Hoseinzadeh,
  • Alireza Khaloo

摘要

This study investigates the axial compression behavior of geopolymer concrete-filled unplasticized polyvinyl chloride tubes (GPCFUPVCT). A total of 54 cylindrical specimens were tested, including 18 unconfined specimens and 36 GPCFUPVCT specimens. The study examines the influence of concrete infill strength (ranging from 20 to 42 MPa), testing age (7, 28, and 90 days), and UPVC tube thickness (4.8 mm and 7.6 mm) on ultimate strength, ductility, and confinement effectiveness. Results show that increasing concrete strength and testing age led to reduced confinement effectiveness, while greater tube thickness improved confinement performance. To assess the predictive capabilities of existing design standards, eight international codes including AISC, EC4, AS/NZS, AIJ, GB, CSA, AASHTO, and ACI were evaluated using both the experimental data from this study and a comprehensive database of 523 CFTT columns reported in the literature. While these codes provide equations for concrete-filled steel tubes, none specifically address CFTTs. Despite the wide variability in experimental data, all codes yielded reasonably accurate predictions. Among them, EC4 and AS/NZS demonstrated the highest accuracy, whereas ACI 318 showed greater scatter in comparison with the experimental results. Based on these findings and guided by the AS/NZS code, a new design equation for predicting the axial load capacity of CFTTs is proposed, showing strong agreement with experimental data.