[1]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()
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《深圳大学学报理工版》[ISSN:1000-2618/CN:44-1401/N]

卷:
第38卷
期数:
2021年第4期
页码:
400-407
栏目:
土木建筑工程
出版日期:
2021-07-07

文章信息/Info

Title:
Analysis of performance of eccentrically compressed steel columns reinforced by outsourcing RPC under secondary loading
文章编号:
202104010
作者:
卜良桃肖礼瀚
湖南大学土木工程学院,湖南长沙 410082
Author(s):
BU Liangtao and XIAO Lihan
College of Civil Engineering, Hunan University, Changsha 410082, Hunan Province, P.R.China
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
Keywords:
structural engineering secondary load reactive powder concrete eccentrically compressed steel column reinforcement bearing capacity
分类号:
TU398.9;TU323.1
DOI:
10.3724/SP.J.1249.2021.04400
文献标志码:
A
摘要:
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.
Abstract:
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.

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备注/Memo

备注/Memo:
Received:2020-11-24;Accepted:2021-03-23;Online(CNKI):2021-06-11
Foundation:National Natural Science Foundation of China (51678231)
Corresponding author:Professor BU Liangtao.E-mail: plt63@126.com
Citation:BU Liangtao,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.(in Chinese)
基金项目:国家自然科学基金资助项目 (51678231)
作者简介:卜良桃 (1963—) ,湖南大学教授.研究方向:工程结构可靠性鉴定与加固技术.E-mail: plt63@126.com
引文: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.
更新日期/Last Update: 2021-07-30