纤维增强塑料
材料科学
耐久性
复合材料
极限抗拉强度
纤维
芯(光纤)
玻璃纤维
条件作用
微观结构
压缩(物理)
结构工程
数学
统计
工程类
作者
Song Wang,Mohamed A. ElGawady
出处
期刊:Journal of Composites for Construction
[American Society of Civil Engineers]
日期:2019-02-01
卷期号:23 (1)
被引量:9
标识
DOI:10.1061/(asce)cc.1943-5614.0000913
摘要
One of the emerging applications of fiber-reinforced polymer (FRP) tubes is hollow-core FRP–concrete–steel (HC-FCS) columns. HC-FCS columns demonstrate superior advantages in material savings and mechanical behavior. However, the lack of long-term data for their durability performance hinders their greater acceptance. This study aims to investigate the degradation of HC-FCS cylinders under combined freeze-thaw, heating-cooling, and wet-dry cycles. Sustained axial loads were also applied to the cylinders during environmental conditioning to simulate the service dead load. Compression tests on cylinders were performed and split-disk tensile tests were performed on FRP rings for both conditioned and control specimens. The test results showed that the environmental conditioning slightly degraded the strength and vertical strain capacities of the HC-FCS cylinders, but caused pronounced degradation of the hoop strain capacities of the glass fiber–reinforced polymer (GFRP) tube. Investigating the microstructure of the FRP before and after conditioning revealed that no chemical reaction took place. However, damage to the interphase of fiber and resin led to damage of the fiber bond. This led to strain concentration and early rupture of the FRP. The sustained load had a negative effect on the cylinders, but had a more obvious effect on strain than on strength.
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