玻璃纤维增强复材管约束纤维增强自密实活性粉末混凝土长柱轴压性能试验研究  

Experimental Research on Mechanical Properties of Fiber-Reinforced Self-Compacting RPC Long Columns Restricted to GFRP Tubers Under Axial Compression

作　　者：祝明桥[1,2] 董嘉睿 李智 ZHU Mingqiao;DONG Jiarui;LI Zhi(School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Hunan Engineering Research Center for Intelligently Prefabricate Passive House,Hunan University of Science and Technology,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]湖南科技大学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》2022年第9期28-34,共7页Industrial Construction

基　　金：国家自然科学基金项目(51578236);湖南省自然科学基金项目(2020JJ4313);湖南省重点实验室开放基金项目(19K033)。

摘　　要：提出了一种流动性能大于255 mm的钢纤维自密实活性粉末混凝土,以钢纤维掺量、GFRP管缠绕角度和长细比为设计参数,设计了7根玻璃纤维增强复材(GFRP)管约束纤维增强自密实活性粉末(RPC)长柱,并对其轴向受力性能进行试验研究。试验结果表明:虽然钢纤维改善了混凝土材料的抗压和抗剪切性能,但其对组合柱的破坏特性影响较小;与±45°GFRP缠绕管相比,±80°GFRP缠绕管对组合长柱的极限承载力和变形性能提升显著;长细比与试件极限承载力呈负相关,长细比越大,曲线的初始刚度及峰值荷载越小。在GFRP约束自密实RPC短柱计算模型的基础上,基于长细比关系的折减系数,提出GFRP约束自密实RPC长柱的极限承载力计算式,计算结果与试验结果均吻合较好,与过往的试验研究误差较小。A steel fiber-reinforced self-compacting reactive powder concrete with greater than 255 mm flowability was proposed.Seven fiber-reinforced self-compacting RPC long columns restricted to GFRP tubes were designed.Their mechanical properties under axial load was studied experimentally,with steel fiber admixture,GFRP tube winding angle,and length-to-fine ratio as design parameters.According to the experiment,the steel fiber could improve the compressive and shear resistance of concrete material but had little influence on the column damage characteristics.The±80°GFRP tubes significantly improved the ultimate bearing capacity and deformation performance compared with the±45°GFRP tubes.The larger the slenderness ratio,the smaller the initial stiffness and peak load of curve.Based on the calculation model of fiber-reinforced self-compacting RPC short columns restricted to GFRP tubes,the ultimate bearing capacity calculation equation of fiber-reinforced self-compacting RPC long columns restricted to GFRP tubes was proposed based on the discount factor of the length to slenderness ratio relations.The calculation results were in good agreement with the test results,and the error was more acceptable compared with the past test data.

关 键 词：组合柱 玻璃纤维增强复材 纤维增强自密实RPC 受压性能 极限承载力 

分 类 号：TU398.9[建筑科学—结构工程]