预制拼装UHPC组合混凝土柱轴压性能试验研究  

Axial Compressive Behaviors of a Prefabricated Assembled UHPC Composite Concrete Column

作　　者：张孝臣 王瑞 鲁亚 吴香国 张学森[4] 邱发强 ZHANG Xiaochen;WANG Rui;LU Ya;WU Xiangguo;ZHANG Xuesen;QIU Faqiang(School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China;College of Civil Engineering,Fuzhou University,Fuzhou 350108,China;Key Lab of Structures Dynamic Behavior and Control(Harbin Institute of Technology),Ministry of Education,Harbin 150090,China;CGN New Holdings Co.,Ltd,Beijing 100070,China;JianYan Test Group Co.,Ltd,Xiamen 361004,China)

机构地区：[1]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090 [2]福州大学土木工程学院,福建福州350108 [3]哈尔滨工业大学结构工程灾变与控制教育部重点实验室,黑龙江哈尔滨150090 [4]中国广核新能源控股有限公司,北京100070 [5]健研检测集团有限公司,福建厦门361004

出　　处：《应用基础与工程科学学报》2024年第2期502-513,共12页Journal of Basic Science and Engineering

基　　金：国家自然科学基金项目(52178195);黑龙江省揭榜挂帅科技攻关项目(2023ZXJ05C01);厦门市建设科技计划项目(XJK2020-1-9)。

摘　　要：为改善装配式建筑连接区域的力学性能,将具有优异力学性能的超高性能混凝土(UHPC)用作连接区域的永久模板,与核心混凝土形成UHPC组合混凝土构件.为研究该新型预制拼装UHPC组合混凝土柱的轴压性能,开展了短柱轴压试验,考察预制UHPC板中纤维含量和预制UHPC板厚度对轴压性能的影响,分析了组合柱和普通钢筋混凝土柱的轴压承载力、延性和耗能等轴压性能指标的差异.结果表明:相比普通钢筋混凝土柱,组合柱的轴压承载力提高了57%~94%,耗能提高了一倍多;预制UHPC外壳中钢纤维含量为3%组合柱的轴压性能,比纤维含量为2%组合柱的轴压承载力、延性和耗能分别提高了23%、56%和114%,即预制UHPC板中纤维含量从2%提高到3%,显著改善了轴压性能.在试验分析的基础上,参照现行《混凝土结构加固设计规范》提出了该新型预制拼装UHPC组合柱的轴压承载力实用计算表达式,给出了UHPC抗压强度折减系数的建议取值.To improve the structural properties at the connection region of prefabricated buildings,ultra-high performance concrete(UHPC)with excellent mechanical properties is used as the permanent formwork for the connection region and a composite member is consisted by UHPC permanent formwork and the core concrete.To study the axial compressive behaviors of this new assembled UHPC-RC composite columns,the axial compressive test of short columns was carried out.The effects of steel fiber contents in precast UHPC panels and the thickness of UHPC panels on axial compressive performance,including axial compressive bearing capacity,ductility and energy absorption capacity,were investigated.The results showed that compared with normal strength concrete column,the axial compressive bearing capacity of composite column was increased by 57%~94%,and energy absorption capacity was improved by more than 100%.The axial compressive bearing capacity,ductility and energy absorption capacity of the composite column with the fiber of 3%in the UHPC jacket was 23%,56%and 114%higher than that of the composite column with the fiber of 2%,that is,the increasing of the fiber content in the UHPC jacket from 2%to 3%,the axial behaviors of composite column can significantly improve.Based on the test results,a new model to calculate the axial bearing capacity of this new UHPC-RC composite columns was proposed,and a reduction factor of the compressive strength of UHPC was given.

关 键 词：组合混凝土柱 轴压试验 预制UHPC板 纤维含量 UHPC板厚度 约束拉杆 

分 类 号：TU375.3[建筑科学—结构工程]