温压同步循环加载作用下混凝土单轴受压本构关系研究

张登祥; 邹翔羿

doi:10.11988/ckyyb.20241266

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长江科学院院报 ›› 0 DOI: 10.11988/ckyyb.20241266

温压同步循环加载作用下混凝土单轴受压本构关系研究

张登祥 ¹^,² ,
邹翔羿 ¹

作者信息 +

Research on the Uniaxial Compressive Constitutive Relationship of Concrete under Synchronized Cyclic Loading of Temperature and Pressure

ZHANG Deng-xiang ¹^,² ,
ZOU Xiang-yi ¹

Author information +

文章历史 +

摘要

为研究温压同步循环加载作用下混凝土的力学性能及损伤本构关系，进行了温压同步循环加载试验、单轴压缩试验与SEM测试，分析了循环次数、循环温度与循环应力对混凝土抗压性能与微观结构的影响。结果表明：在温压同步循环加载作用下，随着循环次数、循环温度与循环应力的增加，混凝土的抗压强度逐渐下降。温压同步循环加载作用加剧了混凝土力学性能的劣化，使其抗压强度较单一荷载作用下明显降低。在温压同步循环加载作用下，混凝土骨料与水泥砂浆之间界面过渡区处微裂纹的扩展连通，是力学性能下降的主要因素。基于等效应变假定，建立了温压同步循环加载作用下混凝土的损伤本构模型。损伤演化曲线表明，温压同步循环加载作用使混凝土的损伤速率加快，峰值应力处的损伤程度增加。

Abstract

To investigate the mechanical properties and damage constitutive relationship of concrete under temperature-pressure synchronous cyclic loading, we conducted the temperature-pressure synchronous cyclic loading test, uniaxial compression tests, and SEM tests. The influence of the number of cycles, cyclic temperature, and cyclic stress on the compressive performance and microstructure of concrete was analyzed. The results indicate that under temperature-pressure synchronous cyclic loading the compressive strength of concrete gradually decline with the increase in the number of cycles, cyclic temperature, and cyclic stress. Temperature-pressure synchronous cyclic loading exacerbates the deterioration of concrete's mechanical properties, resulting in a significant reduction in compressive strength compared to that under single loading. Under temperature-pressure synchronous cyclic loading, the propagation and interconnection of microcracks in the interfacial transition zone between aggregates and cement mortar are the primary factors contributing to the decline in concrete's mechanical properties. Based on the equivalent strain hypothesis, a damage constitutive model for concrete under temperature-pressure synchronous cyclic loading was established. The damage evolution curves reveal that temperature-pressure synchronous cyclic loading accelerates the damage rate of concrete and increases the degree of damage at peak stress.

导出引用

张登祥, 邹翔羿. 温压同步循环加载作用下混凝土单轴受压本构关系研究[J]. 长江科学院院报. 0 https://doi.org/10.11988/ckyyb.20241266

ZHANG Deng-xiang, ZOU Xiang-yi. Research on the Uniaxial Compressive Constitutive Relationship of Concrete under Synchronized Cyclic Loading of Temperature and Pressure[J]. Journal of Changjiang River Scientific Research Institute. 0 https://doi.org/10.11988/ckyyb.20241266

中图分类号： TU528.572

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