深圳大学学报理工版

卜良桃,肖礼瀚.二次受力下外包RPC加固钢柱偏压性能分析[J].深圳大学学报理工版,2021,38(4):400-407.[doi:10.3724/SP.J.1249.2021.04400]
BU Liangtao and XIAO Lihan.Analysis of performance of eccentrically compressed steel columns reinforced by outsourcing RPC under secondary loading[J].Journal of Shenzhen University Science and Engineering,2021,38(4):400-407.[doi:10.3724/SP.J.1249.2021.04400]

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二次受力下外包RPC加固钢柱偏压性能分析

卜良桃,肖礼瀚

湖南大学土木工程学院,湖南长沙 410082

关键词：结构工程; 二次受力; 活性粉末混凝土; 偏压钢柱; 加固; 承载力

Analysis of performance of eccentrically compressed steel columns reinforced by outsourcing RPC under secondary loading

BU Liangtao and XIAO Lihan

College of Civil Engineering, Hunan University, Changsha 410082, Hunan Province, P.R.China

Keywords：structural engineering; secondary load; reactive powder concrete; eccentrically compressed steel column; reinforcement; bearing capacity

DOI: 10.3724/SP.J.1249.2021.04400

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为研究超高性能混凝土对钢柱的加固效果,采用活性粉末混凝土(reactive powder concrete,RPC)对初始荷载作用下的6根足尺偏压钢柱进行外包加固,考虑初始荷载、偏心距和RPC强度对偏压钢柱受力性能的影响,进行二次受力偏压试验.试验结果表明:二次受力下采用RPC加固偏压钢柱能显著提高钢柱的极限承载力、稳定性和刚度.RPC与型钢能够良好地协同工作,加固构件截面基本符合平截面假定.试件的极限承载力随着RPC强度增大而增大,随着始荷载和偏心距增大而减小.当型钢初始荷载与极限荷载比值为0.7时,原构件承载力提升5倍左右. 基于破坏机理,给出了考虑RPC强度折减的极限承载力计算公式,可供实际加固工程参考.

In order to study the effect of ultra-high performance concrete on steel columns, we propose to use reactive powder concrete(RPC)to outsource and reinforce 6 full-scale eccentric steel columns under initial load.Considering the influence of initial load, eccentricity, and RPC strength on the mechanical performance of eccentrically loaded steel columns, we carry out the secondary eccentrically loaded test.The test results show that the use of RPC to reinforce the eccentrically compressed steel column under secondary loading can significantly improve the ultimate bearing capacity, stability and stiffness.RPC and section steel work well together, and the section of the reinforced members basically conforms to the assumption of a flat section. The ultimate bearing capacity of the specimen increases with the increase of RPC strength and decreases with the increase of initial load and eccentricity. When the ratio of the initial load to the ultimate load reaches 70%, the load capacity of the original member can still increase by about 5 times.Based on the failure mechanism and considering the RPC strength reduction, we derive the ultimate bearing capacity calculation formula, which can be used as a reference for practical reinforcement projects.

引言
1 试验概况
2 试验结果分析
3 计算公式
4 结论

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