玻璃纤维增强复材(GFRP)管约束超高性能混凝土(UHPC)组合柱抗震性能分析  

Seismic Performance Behavior Analysis of UHPC Composite Columns Confined by GFRP Tubes

作　　者：祝明桥[1,2] 谭一萍 谭晓鹏 董嘉睿 刘万里 ZHU Mingqiao;TAN Yiping;TAN Xiaopeng;DONG Jiarui;LIU Wanli(School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Hunan Engineering Research Center for Intelligently Prefabricate Passive House,Xiangtan 411201,China)

机构地区：[1]湖南科技大学土木工程学院,湖南湘潭411201 [2]湖南省智慧建造装配式被动房工程技术研究中心,湖南湘潭411201

出　　处：《工业建筑》2024年第11期211-219,共9页Industrial Construction

基　　金：湖南省重点实验室开放基金项目(19K033);湖南省自然科学基金项目(2020JJ4313)。

摘　　要：为研究玻璃纤维增强复材(GFRP)纤维丝缠绕角度与轴压比对GFRP管约束超高性能混凝土(UHPC)组合柱抗震性能的影响,设计了6个GFRP管约束UHPC组合柱和1个UHPC对比柱,并开展了试件在水平低周往复荷载和轴力共同工作下的拟静力试验,分析了试件的骨架曲线特征。为进一步探究径厚比、长细比、约束管环向弹性模量、混凝土抗拉强度对该组合柱抗震性能的影响,建立了一种组合柱有限元分析模型,分析了不同设计下结构的耗能能力。结果表明:GFRP管对提高UHPC柱的抗震性能效果显著,组合柱的破坏形态、峰值荷载和峰值位移均得到提高;有限元分析结果与试验结果吻合良好,验证了分析模型的有效性;通过拓展分析发现,随着径厚比的减小与环向弹性模量的增大,试件的承载力增强,耗能能力变差;随着长细比的减小,试件的承载力增大,极限位移变小,耗能能力变差;混凝土抗拉强度对试件抗震性能有影响,但影响较小。通过回归分析,提出了一种适用于GFRP管约束UHPC组合柱的抗剪承载力计算式。In order to study the influence of winding angle and axial compression ratio of GFRP fibers on the seismic performance of UHPC composite columns confined by GFRP tubes,six GFRP tube confined UHPC composite columns and one UHPC composite column were designed,and the quasi-static tests of the specimens under quasi-static horizontal low cyclic load and axial force were carried out,and the skeleton curve characteristics of the structure were analyzed.In order to further explore the effects of diameter-thickness ratio,slenderness ratio,circumferential elastic modulus of confined tubes,and tensile strength of concrete on the seismic performance of the composite column,a finite element analysis model of composite column is established,and the energy dissipation capacity of the structure with different design schemes was analyzed.The results showed that GFRP tube was effective in improving the seismic performance of UHPC columns,and the failure mode,peak load and peak displacement of composite columns were improved,and the finite element analysis results were in good agreement with the experimental results,which verified the effectiveness of the analysis model.Through the extended analysis,it was found that the bearing capacity of the specimen increased and the energy dissipation capacity became worse with the decrease of diameter-thickness ratio and the increase of circumferential elastic modulus.With the decrease of slenderness ratio,the bearing capacity of the specimen increased,the ultimate displacement became smaller,and the energy dissipation capacity became worse.The tensile strength of concrete had an effect on the seismic performance of the specimen,but the effect was small.Through regression analysis,a formula of shear capacity of UHPC composite columns confined by GFRP tubes was proposed,which provides theoretical reference for the design and engineering practice of UHPC composite columns confined by GFRP tubes.

关 键 词：GFRP管 UHPC 有限元分析 抗震性能 抗剪承载力 

分 类 号：TU377[建筑科学—结构工程] TU352.11