| 摘要: |
| 考虑贝壳含量、龄期等因素，对不同加载应变率下的海水海砂再生混凝土（SSRAC）试件开展了单轴受压应力-应变曲线试验.结果表明：600 d时，与普通混凝土（NAC）相比，SSRAC峰值应力和峰值应变分别提高了10.4%、23.2%，弹性模量降低了29.1%；当掺入贝壳颗粒后，SSRAC应变率敏感性增加；结合试验以及文献数据，基于GB50010模型，考虑不同应变率下特征参数的动态增大系数，提出了适用于中低应变率（10-5~10-1 s-1）下SSRAC受压动力本构模型，并对其曲线特征进行了机理解释. |
| 关键词: 再生混凝土 海水海砂 单轴受压应力-应变曲线 应变率 动态增大系数 |
| DOI：10.3969/j.issn.1007-9629.2024.07.002 |
| 分类号:TU528.01 |
| 基金项目:国家自然科学基金资助项目（52008304）；福建省自然科学基金资助项目（2023J05021）；福建省中青年教师教育科研资助项目（科技类）（JAT210040）；福州大学校基金资助项目（GXRC21059， GXRC21060） |
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| Dynamic Constitutive Model of Seawater and Sea Sand Recycled Aggregate Concrete under Compression |
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ZHANG Qingtian, ZHANG Kaijian
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College of Civil Engineering， Fuzhou University， Fuzhou 350116， China
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| Abstract: |
| A test of the uniaxial compressive stress-strain curve under different strain rates was carried out on seawater and sea sand recycled aggregate concrete（SSRAC） considering different ages and shell contents. The results show that the 600 d peak stress and peak strain of SSRAC increase by 10.4% and 23.2%， respectively， as compared with those of natural aggregate concrete（NAC）. However， the elastic modulus of SSRAC decreases by 29.1%. The strain rate sensitivity of SSRAC increases with the increase in shell content. Then， based on the model in GB50010， a dynamic constitutive model is proposed for SSRAC under medium and low strain rates （from 10-5 s-1 to 10-1 s-1） considering the dynamic increase factor of characteristic parameters. Finally， mechanism analyses of the characteristic of its stress-strain curves are given. |
| Key words: recycled aggregate concrete seawater and sea sand uniaxial compressive stress-strain curve strain rate dynamic increase factor |
