温压同步循环加载作用下混凝土单轴受压本构关系研究
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张登祥（1971— ），男，博士，副教授，主要从事混凝土结构设计理论研究。E-mail：zhangdx098@csust.edu.cn |
收稿日期: 2024-12-13
修回日期: 2025-02-19
网络出版日期: 2025-04-22
基金资助
湖南省自然科学项目(2022JJ30614)
Research on the Uniaxial Compressive Constitutive Relationship of Concrete under Synchronized Cyclic Loading of Temperature and Pressure
Received date: 2024-12-13
Revised date: 2025-02-19
Online published: 2025-04-22
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 . DOI: 10.11988/ckyyb.20241266
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.
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