玄武岩纤维复合筋受拉性能试验及其增强混凝土结构的方式分析  

Test of Tensile Properties of BFRP Bars and Analysis on Its Application Methods in Concrete Structures

作　　者：郑宏宇[1] 廖澍峰 袁世杰 江怀雁 ZHENG Hongyu;LIAO Shufeng;YUAN Shijie;JIANG Huaiyan(Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,School of Civil Engineering and Architecture,Guangxi University Nanning 530004,China;Hualan Design&Consulting Group Nanning 530029,China;Department of Civil Engineering,Guangxi Polytechnic of Construction Nanning 530007,China)

机构地区：[1]广西大学土木建筑工程学院工程防灾与结构安全教育部重点实验室,南宁530004 [2]华蓝设计(集团)有限公司,南宁530029 [3]广西建设职业技术学院土木工程系,南宁530007

出　　处：《广东土木与建筑》2022年第1期80-84,共5页Guangdong Architecture Civil Engineering

基　　金：国家自然科学基金(51968004);2020年度广西高校中青年教师科研基础能力提升项目(2020KY35020)。

摘　　要：为了详细考察玄武岩纤维复合材料(BFRP)筋的受拉力学性能,设计制作了15个筋材拉伸试件,测试其破坏模式、抗拉强度、应力-应变曲线、弹性模量、伸长率,研究破坏模式和筋材直径对受拉性能参数的影响规律。测试结果表明,BFRP筋受拉破坏模式分为全截面拉断和纵向劈裂2种,均为脆性破坏;纵向劈裂破坏的弹性模量较低,破坏模式对其他受拉性能影响不明显;拉伸弹性模量平均值为5.343×10^(4) MPa,约为普通钢筋的1/4;拉断伸长率平均值为1.78%,低于普通钢筋;抗拉强度随筋材直径的增大而有所减小,但筋材直径对拉伸弹性模量、伸长率的影响不明显;BFRP筋用作混凝土结构受拉增强筋时,宜施加预应力,张拉控制应力建议取极限抗拉强度的0.45~0.65倍。In order to investigate the tensile mechanical behaviors of basalt fiber reinforced polymer(BFRP)bar in detail,15 BFRP bar specimens were designed and fabricated,and their failure modes,tensile strength,stress-strain curves,tensile modulus,percentage elongation were tested.The influence regularities of failure modes and diameter of bars to the tensile properties were studied.The test results indicate:the tensile failure modes of BFRP bars include full section fracture and longitudinal splitting,both of which are brittle;the elastic modulus of longitudinal splitting failure is lower,and the failure mode has no obvious effect on other tensile properties;the average tensile elastic modulus is 5.343×10^(4) MPa,about 1/4 of hot rolled steel bar;the average elongation at fracture is 1.78%,which is also lower than that of ordinary steel bar;tensile strength decreases with the increase of diameter of BFRP bar,but diameter has no influence on tensile elastic modulus and elongation;when BFRP bar is utilized as tensile reinforcement in concrete structures,prestress is recommended to be applied,and the prestressing control stress of BFRP bars is suggested to be(0.45~0.65)times of its ultimate tensile strength.

关 键 词：玄武岩纤维塑料 抗拉强度 弹性模量 伸长率 预应力 张拉控制应力 

分 类 号：TU375[建筑科学—结构工程] TU528.572