冻损梯度对承压混凝土应力-应变关系的影响
作者:
作者单位:

1.西安建筑科技大学 土木工程学院,陕西 西安 710055;2.西安建筑科大工程技术有限公司,陕西 西安 710055

作者简介:

刘西光(1984—),男,陕西西安人,西安建筑科技大学副教授,博士生导师,博士.E-mail:xgliu@xauat.edu.cn

通讯作者:

牛荻涛(1963—),男,陕西华县人,西安建筑科技大学教授,博士生导师,博士.E-mail:niuditao@163.com

中图分类号:

TU528.1

基金项目:

国家自然科学基金资助项目(52178163;51808437);陕西省重点研发计划项目(2022SF-403)


Effect of Frozen Damage Gradient on Stress-Strain Relationship of Stressed Concrete
Author:
Affiliation:

1.College of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China;2.XAUAT Engineering Technology Co., Ltd., Xi’an 710055, China

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    摘要:

    对不同冻融损伤程度的混凝土圆环体试件进行了试验研究.结果表明:当相对冻融深度小于临界值时,混凝土的峰值应力、峰值应变均呈线性退化,超过临界值后则保持稳定;当冻融循环次数由100次增加到200次时,相对冻融深度临界值由0.5增大到0.8;基于应变等价性假说和统计损伤理论,建立了不同冻融损伤程度下承压混凝土的应力-应变关系模型.

    Abstract:

    Experimental research was conducted on concrete torus-shaped specimens with different degrees of freeze-thaw damage. The results show that when the relative freeze-thaw depth is less than the threshold, the peak stress and peak strain of concrete exhibit linear degradation, while remained stable after exceeding the threshold. When the number of freeze-thaw cycle increases from 100 times to 200 times, the threshold of relative freeze-thaw depth increases from 0.5 to 0.8. Finally, based on the hypothesis of strain equivalence and statistical damage theory, the stress-strain relationship model of stressed concrete with different degrees of freeze-thaw damage is established.

    表 1 混凝土的配合比Table 1 Mix proportion of concrete
    图1 试件尺寸及张拉装置Fig.1 Specimen size and tensioning device(size: mm)
    图2 冻融损伤承压混凝土圆柱体构件取芯流程图Fig.2 Flow chart of core removal for freeze-thaw damaged stressed concrete cylinder members(size: mm)
    图3 典型混凝土圆柱体构件表面裂缝的开展情况Fig.3 Development of surface cracks of typical concrete cylinder members
    图4 冻融损伤混凝土的单调受压破坏形态Fig.4 Monotonic compression failure modes of freeze-thaw damaged concrete(λ=0.1)
    图5 冻融损伤承压混凝土圆环体试件的单调受压应力-应变曲线和理论结果Fig.5 Monotonic compressive stress-strain curves and theoretical results of the freeze-thaw damaged stressed concrete torus-shaped specimens
    图6 冻融损伤混凝土相对峰值应力的退化规律Fig.6 Degradation of relative peak stress of freeze-thaw damaged concrete
    图7 冻融损伤混凝土相对峰值应变的退化规律Fig.7 Degradation of relative peak stain of freeze-thaw damaged concrete
    图8 参数a随冻融循环次数的变化Fig.8 Variations of parameter a with freeze-thaw cycles
    图9 参数b随冻融循环次数的变化Fig.9 Variations of parameter b with freeze-thaw cycles
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刘西光,雷永洁,周佳丽,牛荻涛,刘俊.冻损梯度对承压混凝土应力-应变关系的影响[J].建筑材料学报,2023,26(10):1054-1061

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  • 收稿日期:2022-11-14
  • 最后修改日期:2023-04-19
  • 在线发布日期: 2023-11-14
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