纤维编织网增强混凝土约束砌体柱的抗压性能

Compressive performance of masonry columns confined by textile-reinforced concrete

考虑了纤维编织网层数、类型及纤维增强复合材料(FRP)端部约束对砌体柱约束效果的影响,并结合纤维编织网增强混凝土(TRC)约束砌体柱抗压强度的设计特征值,对9个TRC约束砌体柱轴压进行试验.结果表明:相较于未约束砌体柱,TRC约束砌体柱表面形成的裂缝得到分散,破坏具有延性特征;TRC约束后砌体柱的抗压承载力和变形能力均得到提升,且变形能力的提升效果更好;在本测试条件下,碳-玻璃纤维编织网的TRC约束效果优于玄武岩-玻璃纤维编织网的;FRP端部约束可以进一步提升砌体柱的抗压承载力,但变形能力降低;获得的TRC约束砌体柱抗压强度设计特征值具有较好的普遍性.

The axial compressive tests on nine TRC(textile-reinforced concrete)-confined masonry columns were carried out. The influence of number of textile layers,types of textile and FRP(fiber-reinforced polymer) confinement at the upper and lower ends on the confinement effect of masonry columns was considered,and the design characteristic values of the compressive strength for TRC-confined masonry columns were further obtained through combining the test results with that of other existing references.The results show that the failure of TRC-confined masonry columns has the ductility feature as compared to unconfined ones because the cracks are dispersed on the specimen surface. The compressive capacity and deformability of masonry columns after TRC confinement both are significantly improved,and the enhancement effect of deformability is more remarkable.The confinement effect of TRC with the carbon-glass textile is better than that of basalt-glass textile in this test.The FRP confinement at the upper and lower ends further improves the compressive capacity of masonry columns,but the deformability decreases.In addition,the design characteristic values of the compressive strength obtained for TRC-confined masonry columns have a better generality.