单波1,2,王志鸿1,肖岩3,赖大德1.RPC管-海水海砂混凝土组合柱抗压性能[J].湖南大学学报:自然科学版,2020,(9):104~112
RPC管-海水海砂混凝土组合柱抗压性能
Compression Performance of Seawater and Sea Sand Concrete Filled RPC Tube Composite Columns under Axial Load
  
DOI:
中文关键词:  海水海砂混凝土  活性粉末混凝土(RPC)  纤维增强复合材料(FRP)    组合效应
英文关键词:seawater and sea sand concrete  reactive powder concrete(RPC)  fiber reinforced polymer(FRP)  column  composite effect
基金项目:
作者单位
单波1,2,王志鸿1,肖岩3,赖大德1 (1. 建筑安全与节能教育部重点实验室(湖南大学)湖南 长沙 410082 2. 绿色先进土木工程材料及应用技术湖南省重点实验室湖南 长沙 410082 3. 浙江大学 浙大-伊利诺大学联合学院浙江 海宁 314400) 
摘要点击次数: 17
全文下载次数: 0
中文摘要:
      在配有碳纤维增强塑料(CFRP)封闭箍筋的活性粉末混凝土(RPC)预制管内浇筑海水海砂混凝土(SWSSC),形成一种新型组合结构--RPC预制管-SWSSC组合柱(SFRPCT). 这种组合柱能有效克服SWSSC中的盐分对构件耐久性的影响,并适用于海洋工程等高腐蚀性环境. 对12个大尺寸SFRPCT试件和3个CFRP箍筋约束SWSSC柱(FRPHSC)开展了轴压试验,研究RPC管与内部SWSSC的组合效应及箍筋间距对轴压性能的影响. 结果表明,在峰值荷载下,RPC管表面产生大量细而密的裂缝,但保护层没有出现明显的剥落现象;SFRPCT的轴向承载力显著高于对应的FRPHSC,这一组合形式将RPC超高的抗压强度和CFRP箍筋的约束效应有效结合了起来. 基于相关试验数据和模型,给出SFRPCT组合柱的轴向承载力计算方法,并对组合效应进行了分析,结果表明,RPC管所承担的荷载与组合柱承载力的比值在0.39~0.42之间.
英文摘要:
      An innovative composite structure, named seawater and sea sand concrete(SWSSC) filled reactive powder concrete(RPC) tube(SFRPCT),was presented in the paper. In the hybrid system, carbon fiber reinforced polymer(CFRP) hoops are arranged in prefabricated RPC tube and then SWSSC is cast in tube. From the material durability point of view, SFRPCT has excellent corrosion resistance and it can be potentially applied in marine construction. A total of 15 large-scale columns were conducted under axial compression test, including 12 SFRPCT specimens and 3 CFRP hoops confined SWSSC(FRPHSC) specimens. Composite effect between RPC tube and internal SWSSC and influence of mechanical properties from lateral confinement level were investigated in test. The results showed that only slight crack on RPC tube of SFRPCT column occurred without any spalling when axial load approached its peak value. Compressive strength and ductility of the SFRPCT columns were significantly higher than those of the corresponding FRPHSC specimen and increased with the increase of the volumetric hoop ratio in RPC tube. Therefore, SFRPCT hybrid system effectively combined the super-high strength of RPC and confinement effect by CFRP hoops. Based on existing test data and model, a calculation method for carrying capacity of SFRPCT was proposed. Contribution ratio of RPC tube for carrying capacity of SFRPCT columns was quantified and its value varied from 0.39 to 0.42.
查看全文  查看/发表评论  下载PDF阅读器
关闭