矩形纤维增强复材-混凝土-钢组合空心柱的轴压试验研究  

EXPERIMENTAL STUDY OF RECTANGULAR FRP-CONCRETE-STEEL DOUBLE-SKIN TUBULAR COLUMN UNDER AXIAL COMPRESSION

作　　者：张冰[1] 魏威 冯贵森 张千标 张宁远 胡夏闽[1] ZHANG Bing;WEI Wei;FENG Guisen;ZHANG Qianbiao;ZHANG Ningyuan;HU Xiamin(College of Civil Engineering,Nanjing Tech University,Nanjing 211816,China;Powerchina Real Estate Group Ltd.,Beijing 100089,China;Tong Yuan Design Group Co.,Ltd.,Jinan 250101,China)

机构地区：[1]南京工业大学土木工程学院,南京211816 [2]中国电建地产有限公司,北京100089 [3]同圆设计集团有限公司,济南250101

出　　处：《工业建筑》2019年第12期195-200,210,共7页Industrial Construction

基　　金：国家自然科学基金青年基金项目(51608263,51978332);江苏省自然科学基金青年基金项目(BK20160998)

摘　　要：纤维增强复材-混凝土-钢组合空心柱是一种由纤维增强复材(FRP)外管,钢内管以及两者之间填充的混凝土组成的新型空心构件。现有研究表明:该组合空心柱具有优越的延性和抗震性能,特别适用于恶劣腐蚀环境下的受压构件,如空心桥墩等。鉴于目前关于矩形FRP-混凝土-钢组合空心柱的研究极少,通过对8个大尺寸矩形FRP-混凝土-钢组合空心柱的轴压试验,研究矩形截面长、短边比,矩形空心柱的空心面积率和FRP管厚度的影响。作为对比,同时进行了4个大尺寸矩形FRP约束混凝土柱的轴压试验。结果表明:对于矩形组合空心柱,较大的截面长、短边比并不会降低对混凝土的约束作用;恰恰相反,较大的截面长、短边比提高了约束混凝土的极限应力和延性;矩形组合空心柱的混凝土受到钢管和FRP管的共同约束,表现出了很好的延性;相比矩形FRP约束实心混凝土柱,内部空心的存在并没有降低约束混凝土的极限应力和极限应变。FRP-concrete-steel double-skin tubular columns(DSTCs) are a novel hollow-core column with an outer FRP tube, an inner steel tube and an annular layer of concrete filled in between. Existing studies confirmed that the novel column had excellent ductility and seismic behavior, and the novel column was especially suitable for compressive members under severe corrosive environment, such as hollow bridge piers. However, there were few studies on rectangular DSTCs. The test was conducted on eight large-scale rectangular DSTCs under axial compression. The effect of the aspect ratio of the rectangular cross-section, the void area ratio and the thickness of the FRP tube were investigated. For comparison, four large-scale rectangular FRP-confined concrete columns were also tested under axial compression. Test results showed: the aspect ratio of DSTCs had no detrimental effect on the confinement of FRP tube;on the contrary, the ultimate stress and the ductility of DSTCs increased with the increase of the aspect ratio;the confined concrete in DSTCs showed good ductility due to the confinement of FRP tube and steel tube;compared to rectangular FRP-confined concrete column, the inner void of DSTCs had no negative effect on the strength and ductility of the confined concrete.

关 键 词：FRP 矩形FRP-混凝土-钢组合空心柱 轴压试验 长边短边比 应力-应变曲线 

分 类 号：TU398.9[建筑科学—结构工程]