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预制UHPC-RAC组合短柱轴压性能

Axial compression performance of precast UHPC-RAC composite short column

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将优势互补的超高性能混凝土(Ultra-high performance concrete,UHPC)和再生混凝土(Recycled aggregate concrete,RAC)组合设计为预制UHPC-RAC组合柱.以箍筋位置、UHPC壁厚和UHPC-RAC结合面粗糙度为参数,设计制作了 7个预制UHPC-RAC组合短柱,通过轴压试验,分析了破坏形态、材料应变、荷载-位移曲线、承载力、泊松比和损伤等性能参数.结果表明:预制UHPC-RAC组合短柱改善了RAC短柱的破坏形态,因外围UHPC与箍筋形成组合作用对内部RAC约束效果的不同,分为强约束的剪切压溃破坏和弱约束的外壁UHPC劈裂破坏;配箍UHPC及其厚度的增加,增强了外围UHPC的约束作用,提高了预制UHPC-RAC组合短柱的轴压刚度和受压承载力,最大可提升 93.3%和 97.4%,降低了泊松比和损伤指数,其中泊松比的变化范围为 0.26～0.18;UHPC-RAC结合面粗糙度对轴压性能呈现有利影响但差异较小.强约束效果保证了高性能材料力学性能的发挥,采用叠加原理,建立了可准确计算强约束预制UHPC-RAC组合柱的受压承载力计算公式,并提出了预制UHPC-RAC组合短柱的设计要求,提升材料的利用率.
The combination design of ultra-high performance concrete(UHPC)and recycled aggregate concrete(RAC)forms the precast UHPC-RAC composite columns.Seven precast UHPC-RAC composite short columns were designed and fabricated with the parameters of stirrup position,UHPC thickness and UHPC-RAC interface roughness.The failure form,material strain,load-displacement curve,bearing capacity,Poisson's ratio and damage were analyzed through the axial compression experiments.The results show that the precast UHPC-RAC composite short columns improve the failure pattern,which can be divided into strong confining shear collapse failure and weak confining of UHPC splitting due to the difference in the binding effect of the combination of external UHPC and stirrup on internal RAC.The increase thickness of hooped UHPC ensures the enhancement of external UHPC restraint.The restraint effect of the outer UHPC is enhanced with the increase of the hoop UHPC and its thickness.The axial compressive stiffness and compression capacity of the prefabricated UHPC-RAC short column are increased by 93.3%and 97.4%at the maximum,and the Poisson's ratio and damage index are decreased,with the Poisson's ratio varying from 0.26 to 0.18.The roughness of UHPC-RAC bonding surface has little difference on the favorable influence of axial compression performance parameters.The strong constraint effect can make full use of the mechanics of high performance materials.Based on the superposition principle,the calculation formula of the compression capacity of the strongly constrained precast UHPC-RAC composite column is established,and the design requirements of the precast UHPC-RAC composite short column are proposed to improve the utilization rate of the material.

ultra-high performance concreterecycled aggregate concreteprecast composite short columnre-straining effectaxial compression performancecompressive capacity

秦朝刚、杜锦霖

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长安大学 建筑工程学院,西安 710061

超高性能混凝土 再生混凝土 预制组合短柱 约束作用 轴压性能 受压承载力

中国博士后科学基金陕西省自然科学基础研究计划中央高校基本科研业务费专项长安大学高新技术项目

2021T1405872023-JC-YB-326300102282208

2024

10.13801/j.cnki.fhclxb.20231020.002

复合材料学报
北京航空航天大学 中国复合材料学会

复合材料学报

CSTPCD北大核心
影响因子：0.933
ISSN：1000-3851
年,卷(期)：2024.41(6)