钢管超高强玄武岩纤维混凝土柱偏心受压性能研究  

Mechanical property for eccentric loaded ultrahigh-strength basalt-fibre concrete-filled steel-tube

作　　者：杨智硕 陈明霞 叶梅新[2] Yang Zhishuo;Chen Mingxia;Ye Meixin(School of Civil Engineering Jiaying University,Meizhou 514015,China;School of Civil Engineering Central South University,Changsha 410083,China)

机构地区：[1]嘉应学院土木工程学院,广东梅州514015 [2]中南大学土木工程学院,湖南长沙410083

出　　处：《建筑科学》2021年第9期144-150,共7页Building Science

基　　金：国家基金项目(51408449);福建省重点基金项目(2014Y0071);福建省住建厅项目(2020-K-19);莆田市科技局项目(2019SP002);嘉应学院校级高等教育教学改革项目(JYJG20210117、JYJG20210215);广东省普通高校特色创新类项目(2021KTSCX123)。

摘　　要：本文以玄武岩纤维含量分别为0和2%的钢管-超高强混凝土柱(UCS)为研究对象,完成了18根偏心率(λ)分别为0、0.24、0.47和0.71的UCS偏心受压试验,研究了破坏模式、极限承载力、荷载与应变曲线,分析了玄武岩纤维对钢管-超高强混凝土柱影响机理。试验结果表明:①玄武岩纤维有效提高了UCS的承载力;②偏心率对UCS的极限承载力影响比较大;③玄武岩纤维提高了混凝土的抗剪强度,从而提高了UCS抗弯能力,当λ=0.71,N=3100kN时,在玄武岩纤维含量为0和2%的UCS中部最大位移分别为4.195mm和3.565mm,玄武岩纤维有效降低了UCS中部的位移,减少率达到17.7%。Ultra-high-strength Concrete-fill Steel-tube(UCS)with and without basalt fiber via laboratory experiments are investigated in this paper.18 UCSs under eccentric compressions with eccentricity(λ)of 0,0.24,0.47 and 0.71,respectively,are researched in the experiments.The failure mode,ultimate bearing capacity,load and strain curve are studied.Then the influence of basalt fiber on UCS is also analyzed.The conclusions are drawn as follows:①Basalt fiber effectively improves the bearing capacity of UCS;②λ has a greater influence on the ultimate bearing capacity of UCS;③Basalt fiber improves the shear strength of concrete,thereby improving the bending resistance of UCS.Whenλ=0.71 and N=3100 kN,when the basalt fiber content is0 and 2%,the displacement in the middle of UCS is 4.195 mm and 3.565 mm,respectively.Therefore,the contribution of basalt fiber to UCS is obvious.

关 键 词：力学性能 钢管超高强混凝土 玄武岩纤维 试验研究 偏心抗压 

分 类 号：TU528.59[建筑科学—建筑技术科学]