摘要
为研究不同端部约束对玻璃纤维增强聚合物(GFRP)管混凝土长柱轴压性能的影响,进行了两端固结、一端固结一端铰结和两端铰结约束的单调轴压试验,主要分析了端部约束对试件的破坏形态,荷载应变曲线、极限承载力和侧向位移的影响。结果表明,两端固结的破坏模式为端部材料发生脆性破坏,两种铰接则为弯曲失稳;两端固结具有最高的极限承载力和延性,两种铰结较两端固结极限承载力分别下降23.9%和25.5%,轴向极限应变分别下降53.4%和65.8%;现有稳定系数法极限承载力计算模型总体与试验吻合较好;两端铰结侧向位移增长最为显著,采用理想压杆挠度曲线模型对试验数据拟合效果良好,极限荷载下,两端铰结侧向位移峰值分别高于两端固结和一固一铰41.4%和35.8%。
This study experimentally investigated the effect of end restraint conditions on the axial compressive performance of concrete-filled glass fiber-reinforced polymer(GFRP)tube long columns.Monotonic axial compression tests were conducted on specimens under three distinct boundary conditions:both ends fixed,one end fixed and one end hinged,and both ends hinged.The failure modes,load-strain responses,ultimate bearing capacity,and lateral displacement were systematically analyzed.The results indicated that there was a transition in failure mode from a brittle end failure in fixed-fixed columns to global bending instability in columns with hinged ends.The fixed-fixed configuration demonstrated the highest ultimate bearing capacity and ductility.In contrast,the ultimate bearing capacity for the one-end-hinged and both-ends-hinged configurations decreased by 23.9%and 25.5%,respectively,while their ultimate axial strains were reduced by 53.4%and 65.8%.The lateral displacement was most pronounced in the both-ends-hinged configuration,with its peak value at ultimate load being 41.4%and 35.8%higher than that of the fixed-fixed and fixedhinged configurations,respectively.The experimental data correlated well with an ideal buckling curve model.Furthermore,predictions from an existing stability factor model for ultimate bearing capacity showed good agreement with the test results.These findings underscore the critical importance of end restraint conditions in the design and stability analysis of concrete-filled GFRP long columns.
作者
金清平
武博
易建明
JIN Qingping;WU Bo;YI Jianming(School of Urban Construction,Wuhan University of Science and Technology,Wuhan 430065,China;Huaxin Chaokelong New Building Material Technology(Huangshi)Co,Ltd,Huangshi 435000,China)
出处
《中国塑料》
北大核心
2025年第10期69-75,共7页
China Plastics
关键词
玻璃纤维增强聚合物管混凝土长柱
端部约束
轴压性能
极限承载力模型
侧向位移
concrete-filled glass fiber reinforced polymer tube long columns
end restraints
axial compressive performance
ultimate bearing capacity model
lateral displacement
