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海水海砂再生混凝土受压动力本构模型

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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.
Dynamic Constitutive Model of Seawater and Sea Sand Recycled Aggregate Concrete under Compression
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.

recycled aggregate concreteseawater and sea sanduniaxial compressive stress-strain curvestrain ratedynamic increase factor

张青天、张凯建

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福州大学 土木工程学院,福建 福州 350116

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

国家自然科学基金资助项目福建省自然科学基金资助项目福建省中青年教师教育科研资助项目(科技类)福州大学校基金资助项目福州大学校基金资助项目

520083042023J05021JAT210040GXRC21059GXRC21060

2024

10.3969/j.issn.1007-9629.2024.07.002

建筑材料学报
同济大学

建筑材料学报

CSTPCD北大核心
影响因子：1.046
ISSN：1007-9629
年,卷(期)：2024.27(7)