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
张孝臣 1王瑞 1鲁亚 1吴香国 2张学森 3邱发强4
作者信息
- 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;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
- 3. 中国广核新能源控股有限公司,北京 100070
- 4. 健研检测集团有限公司,福建厦门 361004
- 折叠
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.
Abstract
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Key words
composite concrete columns/axial compressive test/precast UHPC permanent formwork/steel fiber content/thickness of UHPC panels/bolt connector引用本文复制引用
基金项目
国家自然科学基金(52178195)
黑龙江省揭榜挂帅科技攻关计划(2023ZXJ05C01)
厦门市建设科技计划(XJK2020-1-9)
出版年
2024
NETL
NSTL
万方数据