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RPC管混凝土组合柱高温后轴压性能试验研究

2018-12-11单波陈超赖大德刘福财

湖南大学学报·自然科学版 2018年9期
关键词:力学性能

单波 陈超 赖大德 刘福财

摘要:针对RPC(活性粉末混凝土)管混凝土组合柱(CFRT)这一新型组合结构的抗火性能开展试验研究.采用高温试验炉对7个大尺寸CFRT短柱进行升温试验及高温后的轴压试验,试验参数包括控制温度、配箍率和配箍方式.结果表明,CFRT高温下未发生爆裂现象;高温后的轴压承载力和刚度随试验温度的提高而降低,但具有相对较高的残余承载力;提高配箍率和采用双层配箍方式,有利于改善CFRT高温后的抗压性能;与已有的普通钢筋混凝土约束柱抗火试验结果相比较,CFRT具有更高的残余承载力比.CFRT具有优异的抗火性能.

关键词: 活性粉末混凝土(RPC);组合柱;高温;约束;力学性能

中图分类号:TU398.9文献标志码:A

Experimental Research on Mechanical Properties

of Concretefilled RPC Tube Columns after High Temperature

SHAN Bo1,2, CHEN Chao1, LAI Dade1, LIU Fucai3

(1. College of Civil Engineering, Hunan University, Changsha 410082,China; 2. Key Laboratory for Green

& Advanced Civil Engineering Materials and Application Technology of Hunan Province, Changsha410082,China;

3. Guangdong Gaiteqi New Materials Technology Co Ltd, Qingyuan511600,China)

Abstract:Fire resistance of Concretefilled RPC tube (CFRT) columns were investigated by experimental study. Seven largescale CFRT specimens were performed by heating test and axial compression test after elevated temperature. The test parameters included control temperature, volumetric stirrup ratio and stirrup arrangement mode. The test results showed the spalling of concrete was not observed during elevating temperatures. The compressive performance of CFRT column after high temperature decreased with the rising control temperature. Both increasing the volumetric stirrup ratio and arranging double layers of spiral hoops were effective measures for improving the mechanical properties of the CFRT columns after high temperature. Compared with the existing test results, the residual load carrying capacity ratio of the CFRT after elevated temperature was higher than that of the ordinary steelconfined column. The CFRT columns exhibited excellent fire resistance.

Key words:reactive powder concrete (RPC); composite columns; high temperature; confinement;mechanical properties

对混凝土施加侧向约束,是提高结构柱抗压性能的有效方式.目前,基于约束效应的组合柱主要有:钢管混凝土(CFT)柱、纤维增强复合材料(FRP)约束混凝土柱和箍筋约束混凝土(SCC)柱[1-3].这些组合柱具有各自的特点,许多研究者进行了深入研究,并在工程中得到广泛应用.但是,这些组合柱在性能上也存在一定的缺陷,如钢管的抗火性能和耐腐蚀性能差[4-5];FRP材料的力学性能对温度比较敏感[6-7];而对于箍筋约束混凝土,其混凝土保护层在受力过程中过早剥落,对承载力没有贡献[8-9],且不便于装配施工.这些不足之处限制了组合柱的使用范围,特别是在高温、高腐蚀环境中(如海岸工程、远洋岛礁工程等)的应用[10].

作者提出了一种新型组合柱——活性粉末……

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