| 摘要: |
| 以纤维类型及其体积分数为变量，通过单轴拉伸试验，研究了海砂工程水泥基复合材料（SECC）的单轴拉伸性能，并基于现有工程水泥基复合材料（ECC）的拉伸本构模型，阐述了SECC的稳态开裂机理，提出以强化段与软化段描述SECC拉伸应力-应变关系的波动上升段和下降段，得到了新的适用于SECC的拉伸本构模型.结果表明：纤维体积分数为1.5%的聚乙烯（PE）纤维/SECC表现出饱和多缝开裂的应变硬化行为，其延性可达到3.99%；提出的SECC拉伸本构模型计算结果可准确描述具有稳态开裂行为SECC的拉伸应力-应变关系. |
| 关键词: 纤维 海砂 水泥基复合材料 拉伸性能 本构模型 |
| DOI：10.3969/j.issn.1007-9629.2022.09.013 |
| 分类号:TU528.58 |
| 基金项目:国家自然科学基金资助项目 （11962001）；中国博士后科学基金资助项目 （2018M633298）；广西科技计划项目 （桂科AB17292032）；广西自然科学基金资助项目（2018GXNSFBA138060） |
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| Tensile Properties and Constitutive Model of PE/PVA Fiber Sea Sand ECC |
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YAO Qiyao1, LU Chenyu1, LUO Yuejing2,3, XIE Zhengzhuan3, TENG Xiaodan1,4,5,6
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1.School of Civil Engineering and Architecture， Guangxi University， Nanning 530004， China;2.Hualan Design & Consulting Group， Nanning 530011， China;3.Guangxi Transportation Science & Technology Group Co.， Ltd.， Nanning 530007， China;4.Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education， Guangxi University， Nanning 530004， China;5.Guangxi Key Laboratory of Disaster Prevention and Engineering Safety， Guangxi University， Nanning 530004， China;6.Guangxi Xinfazhan Communications Group Co.， Ltd.， Nanning 530028， China
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| Abstract: |
| Taking the fiber type and its volume fraction as variables， the uniaxial tensile properties of sea sand engineered cementitious composites（SECC） were studied through uniaxial tensile test. Based on the existing tensile constitutive model of engineered cementitious composites（ECC）， the steady-state cracking mechanism of SECC was expounded. The fluctuating rising and falling segments of the tensile stress-strain curves of SECC were attributed to the strengthening and softening， and a new tensile constitutive model suitable for SECC was obtained. The results show that polyethlene （PE） fiber/SECC with 1.5% fiber volume fraction exhibits the strain hardening behavior of saturated multi-crack， and the ductility can reach 3.99%. The proposed SECC tensile constitutive model can accurately describe the tensile stress-strain relationship of SECC with steady cracking behavior. |
| Key words: fiber sea sand cementitious composite tensile performance constitutive model |
