超高性能混凝土(UHPC)包覆钢管混凝土叠合构件抗弯性能试验研究  

Experimental Research on Flexural Performance of UHPC Encased CFSTs Under Pure Bending

作　　者：杨昱幸 廖飞宇 王静峰[2] 陈宇峰 林秋辉 凃丰钦 YANG Yuxing;LIAO Feiyu;WANG Jingfeng;CHEN Yufeng;LIN Qiuhui;TU Fengqin(College of Transportation and Civil Engineering,Fujian Agriculture and Forestry University,Fuzhou 350108,China;School of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,China;Fujian Construction Engineering Group Company,Fuzhou 350003,China)

机构地区：[1]福建农林大学交通与土木工程学院,福州350108 [2]合肥工业大学土木与水利工程学院,合肥230009 [3]福建建工集团有限责任公司,福州350003

出　　处：《工业建筑》2024年第11期112-120,共9页Industrial Construction

基　　金：国家自然科学基金项目(52378140);中央引导地方科技发展项目(2022L3007);福建省中青年教师教育科研项目(JAT210087)。

摘　　要：UHPC包覆钢管混凝土叠合构件具有承载力高和耐久性能优越等优点。为研究其抗弯性能,完成了5根UHPC包覆钢管混凝土叠合构件纯弯试验,主要参数为钢纤维掺量和含钢管混凝土率。基于试验研究,考察了不同参数对试件的破坏形态、跨中弯矩-挠度曲线、极限抗弯承载力、抗弯刚度和延性的影响规律,结果表明:外包UHPC钢管混凝土叠合构件抗弯性能优异,受弯状态下各组件能保持良好的协同工作,试件的抗弯承载力随着外包UHPC钢纤维掺量和含钢管混凝土率的增大而增大,尤其在钢纤维掺量由0%变化为1%时承载力提升幅度尤为明显。采用现行规程公式计算本研究UHPC包覆钢管混凝土叠合构件抗弯承载力偏于安全11%~38%,计算抗弯刚度总体上偏于保守。Ultra-high-performance concrete(UHPC)encased concrete-filled steel tubes(CFST)have advantages such as high bearing capacity and superior durability.In order to study their flexural performance,five pure bending tests of UHPC encased CFSTs members were designed.The main parameters were the steel fiber content and the ratio of concrete-filled steel tube.Based on the experimental study,the effects of different parameters on failure mode,midspan load-deflection curves,ultimate flexural capacity,flexural stiffness,and ductility were investigated.The results showed that UHPC encased CFSTs members exhibited excellent performance.Under bending,each component could maintain good collaboration.The flexural capacity increased with the increase of the UHPC steel fiber content and the ratio of concrete-filled steel tube,especially when the steel fiber content increased from 0%to 1%,the increase in bearing capacity was particularly significant.The predictions by current codes and standards for flexural capacity of UHPC encased CFST members were 11%-38%lower than the measured ones,and the predicted flexural stiffness was generally conservative.

关 键 词：UHPC包覆 钢管混凝土 叠合构件 抗弯承载力 抗弯刚度 

分 类 号：TU398.9[建筑科学—结构工程]