GFRP管约束钢管混凝土加劲混合柱偏压力学性能试验研究  

Experimental study on mechanical properties of GFRP tubed confined concrete-encased concrete filled steel tubular columns under eccentric compression

作　　者：曾钧柯 梁睿 苏全福 李双蓓[1,3] ZENG Junke;LIANG Rui;SU Quanfu;LI Shuangbei(College of Civil and Engineering and Architectural,Guangxi University,Nanning 530004,Guangxi,China;Guangxi Communications Design Group Co.,Ltd.,Nanning 53oo29,Guangxi,China;Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,Guangxi University,Nanning 530004,Guangxi,China)

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]广西交通设计集团有限公司,广西南宁530029 [3]广西大学工程防灾与结构安全教育部重点实验室,广西南宁530004

出　　处：《实验力学》2023年第5期585-594,共10页Journal of Experimental Mechanics

基　　金：国家自然科学基金项目(51878186,51738004);广西重点研发计划(桂科AB22036007)。

摘　　要：为改善钢管混凝土加劲混合构件因钢管内外混凝土存在力学差异,组合效应较低的不足,采用玻璃纤维增强复合材料(GFRP)管对其进行约束,研究了GFRP管约束钢管混凝土加劲混合柱(FCECFST)的偏压力学性能,将FCECFST与普通钢管混凝土加劲混合柱、GFRP管约束钢筋混凝土柱和钢管混凝土柱进行偏压试验对比,通过荷载-变形曲线、侧向挠度分布曲线和荷载-应变曲线剖析了试件破坏机理。研究结果表明:FCECFST偏压破坏以环向纤维断裂为标志;相比其他3种组合构件,FCECFST荷载-变形曲线峰值更高且下降段更平缓,表现出良好的极限承载力、抗弯刚度、延性性能和耗能能力;GFRP管对外围混凝土约束作用明显,对试件偏压力学性能影响显著。In order to improve the mechanical difference between the inner and outer concrete of the steel tube and the low combination effect of the concrete-encased concrete filled steel tubular(CFST)members,glass-fiber reinforced polymer(GFRP)tube was used to constrain them.This paper studied the mechanical properties of GFRP tubed confined concrete-encased CFST member(FCECFST)under eccentric pressure and compared it with ordinary concrete-filled steel tube reinforced composite column,GFRP tube restrained reinforced concrete column,and concrete-filled steel tube column through the test of eccentric pressure.The load-deformation curves,lateral deflection distribution curves,and load-strain curves were used to analyze the failure mechanism of the specimens.The results show that the damage of FCECFST under bias is marked by the fracture of circumferential fibers.Compared with the other three composite members,FCECFST has a higher peak value of load deformation curve and a smoother falling section,showing good ultimate bearing capacity,flexural rigidity,ductility,and energy dissipation capacity.The GFRP tube has an obvious restraint effect on the peripheral concrete and has a significant influence on the mechanical properties of the specimens under eccentric pressure.

关 键 词：钢管混凝土加劲混合构件 组合柱 GFRP管 静力试验 偏压性能 

分 类 号：TU398[建筑科学—结构工程]