早龄期机制砂混凝土抗压强度与弹性模量时效关系及本构模型试验研究  

Experimental Study on the Time-dependent Relationship Between Compressive Strength and Elastic Modulus and Constitutive Model of Early-age Manufactured Sand Concrete

作　　者：郭琦[1] 张卓 蒲广宁 刘斌[1] 孙虎平[2] GUO Qi;ZHANG Zhuo;PU Guangning;LIU Bin;SUN Huping(College of Civil Engineering,Xi an University of Architecture and Technology,Xi an,Shaanxi 710055,China;Xi an Municipal Design&Research Institute Co.,Ltd.,Xi an,Shaanxi 710000,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]西安市政设计研究院有限公司,陕西西安710000

出　　处：《公路工程》2024年第2期138-144,共7页Highway Engineering

基　　金：陕西省自然科学基础研究计划项目(2023-JC-YB-286);陕西省教育厅产业化项目(21JC023);西安建筑科技大学2022年度大学生创新创业训练计划项目(S202210703091)。

摘　　要：为了研究早龄期机制砂混凝土在单轴受压状态下抗压强度与弹性模量的时效关系和本构模型,通过对8组不同龄期的C60机制砂混凝土试件进行立方体抗压强度试验、静力受压弹性模量试验和单轴受压应力-应变曲线试验,并参考多种已有研究模型,建立了早龄期机制砂混凝土在单轴受压状态下的抗压强度与弹性模量时效关系模型和分段式应力-应变本构模型。结果表明,采用的抗压强度与弹性模量时效关系模型和分段式应力-应变本构模型与试验数据吻合效果理想,能够较好地描述早龄期C60机制砂混凝土在单轴受压状态下的力学性能。In order to study the time-dependent relationship between compressive strength and elastic modulus and the constitutive model of early-age manufactured sand concrete under uniaxial compression,cube compressive strength test,static compressive elastic modulus test and uniaxial compressive stress-strain curve test were conducted on 8 groups of C60 manufactured sand concrete specimens of different ages,and many existing research models were referred to.The relationship model between compressive strength and elastic modulus and the piecewise stress-strain constitutive model of early-age manufactured sand concrete under uniaxial compression are established.The results show that the time-dependent relationship model between compressive strength and elastic modulus and the piecewise stress-strain constitutive model are in good agreement with the experimental data,and can better describe the mechanical properties of early-age C60 manufactured sand concrete under uniaxial compression.

关 键 词：早龄期 时效关系 分段式 本构模型 

分 类 号：TU528[建筑科学—建筑技术科学]