林业工程学报2025，Vol.10Issue(3)：154-162,9.DOI:10.13360/j.issn.2096-1359.202401038
BFRP筋-海水海砂钢管混凝土叠合柱的轴压性能
Study on axial compression performance of BFRP bar and seawater sand concrete-filled steel tube composite column
摘要
Abstract
The concrete-filled steel tube(CFST)composite column,known for its excellent mechanical properties,consists of a core of CFST encased in reinforced concrete.However,the structures in coastal areas often face significant durability issues due to severe erosion factors.To address these challenges,this study proposes a novel composite structure that integrates basalt fiber-reinforced polymer(BFRP)bars into seawater sand concrete columns,utilizing the excellent corrosion resistance of BFRP materials.The axial compression performance of eight square BFRP bar-reinforced seawater sand concrete-filled steel tube composite columns is investigated in this study.The primary focus is on the effects of BFRP stirrup spacing,steel tube length,and thickness on the axial compression properties of these composite columns.Experimental results demonstrate that the axial compression performance of composite columns,constrained by both BFRP stirrups and steel tubes,is significantly superior to that of columns constrained solely by BFRP bars.Specifically,when the stirrup spacing is reduced from 100 to 70 mm,the load-carrying capacity of the composite columns is increased by 1.2%to 20.6%.Furthermore,the increase in the steel tube thickness from 2.5 mm to 5.0 mm results in an increase in load-carrying capacity from 10.1%to 29.7%.To better understand these findings,this study combines the composite confining effects of both BFRP bars and FRP-steel tubes.Based on this comprehensive analysis,a new calculation model is proposed to accurately predict the axial compressive capacity of the BFRP bar-reinforced seawater sand concrete composite columns.The predictive model has shown high accuracy in estimating the load-carrying capacities observed in the experimental tests.This study highlights the potential of BFRP bar-reinforced CFST composite columns in improving structural performance,particularly in corrosive environments such as coastal areas.By optimizing stirrup spacing and steel tube thickness,significant improvements in the load-carrying capacity of these columns can be achieved.The proposed calculation model provides a reliable tool for accurately predicting the performance of these advanced composite structures,supporting their broader application in construction projects where the enhanced durability and mechanical performance are critical.This study contributes to the development of innovative construction materials and techniques aimed at extending the lifespan and ensuring the safety of structures exposed to harsh environmental conditions.关键词
BFRP筋/海水海砂混凝土/钢管混凝土叠合柱/轴压试验/计算模型Key words
BFRP bar/seawater sand concrete/concrete-filled steel tube composite column/axial compression test/calculating model分类
建筑与水利引用本文复制引用
岳鹏飞,魏洋,董志强,张依睿,黄哲..BFRP筋-海水海砂钢管混凝土叠合柱的轴压性能[J].林业工程学报,2025,10(3):154-162,9.基金项目
国家自然科学基金(51778300) （51778300）
江苏省自然科学基金(BK20231293). （BK20231293）
