GFRP约束ECC短柱偏压试验研究
Experimental Study on Eccentric of GFRP-confined ECC Short Columns
史玉英 1袁婉莹 2韩强1
作者信息
- 1. 北京工业大学桥梁工程安全与韧性全国重点实验室,北京 100124
- 2. 北京建筑大学土木与交通工程学院,北京 100044
- 折叠
摘要
纤维增强复合材料(Fiber Reinforced Polymer,FRP)约束工程纤维增强水泥基复合材料(Engineered Fiber Reinforced Ce-mentitious Composites,ECC)轴压柱可显著提高其承载能力和延性,但偏压作用下FRP约束ECC柱的性能提升程度和作用机理有待研究.基于此,以偏心距(0、10、30、50 mm)和FRP层数(0、2、4层)为试验变量,对玻璃纤维增强复合材料(Glass Fiber Rein-forced Polymer,GFRP)约束ECC短柱展开了竖向加载试验,并对试验结果进行了分析.研究结果表明:小偏心破坏时受压侧FRP断裂、混凝土被压碎,大偏心破坏时受拉侧FRP撕裂与混凝土横向裂缝近乎同时出现.轴压作用下,轴向变形和抗压强度显著增大;偏压作用下,抗压承载力随着偏心距的增大而减小,而极限位移无明显变化规律.此外,承载力和延性都随着FRP层数的增加而增大.
Abstract
That fiiber reinforced polymer(FRP)constrained engineering fiber reinforced cementitious composites(ECC)axial compression columns can significantly improve the bearing capacity and ductility.But the degree and mecha-nism of performance improvement of FRP constrained ECC columns under eccentric compression should be studied.Based on this,vertical loading tests were conducted on ECC short columns constrained by glass fiber reinforced polymer(GFRP)with experimental variables of eccentricity(0,10,30,50 mm)and FRP layers(0,2,4 layers).And the test results were analyzed.The research results indicate that the compression side FRP fractures and the concrete crushes during small eccentricity failure.While during large eccentricity failure,the tensile side FRP tears and transverse cracks of concrete occur almost simultaneously.Under axial compression,both the axial deformation and compressive strength significantly increase;Under the action of bias,the compressive bearing capacity de-creases with the increase of eccentricity,while the ultimate displacement shows no significant change pattern.In addition,both the bearing capacity and ductility increase with the increase of FRP layers.
关键词
GFRP/ECC短柱/约束/偏压试验/偏心距/FRP层数Key words
glass fiber reinforced polymer(GFRP)/engineered fiber reinforced cementitious composites(ECC)short column/constraints/eccentric compression test/eccentricity/fiber reinforced polymer(FRP)layers引用本文复制引用
基金项目
国家自然科学基金重点项目(52338010)
出版年
2024
国家科技期刊平台
NSTL
万方数据