基于耗散能理论的橡胶自密实混凝土疲劳力学性能研究

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发布时间：2020-01-06 00:00:00

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基于耗散能理论的橡胶自密实混凝土疲劳力学性能研究

Study on Fatigue Mechanical Property of Rubber Self-compacting Concrete Based on Energy Dissipation

2021年第6期

橡胶自密实混凝土；疲劳试验；耗散能；力学特性

Rubber self-compacting concrete; Fatigue test; Energy dissipation; Mechanical property

2021年第6期

10.19761/j.1000-4637.2021.06.019.06

国家自然科学基金面上项目（51979090）；江苏省自然科学优秀青年基金项目（BK20190075）；中国科协青年人才托举项目（2017QNRC001）。

田华轩，陈徐东，陈晨，刘志恒

河海大学土木与交通学院，江苏南京 210098

田华轩，陈徐东，陈晨，刘志恒

田华轩,陈徐东,陈晨,等.基于耗散能理论的橡胶自密实混凝土疲劳力学性能研究[J].混凝土与水泥制品,2021(6):19-24.

TIAN H X,CHEN X D,CHEN C,et al.Study on Fatigue Mechanical Property of Rubber Self-compacting Concrete Based on Energy Dissipation[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(6):19-24.

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摘要：为研究橡胶自密实混凝土在循环荷载作用下的疲劳寿命，利用MTS液压伺服试验机进行了橡胶自密实混凝土四点弯曲疲劳试验。基于能量法分析了橡胶自密实混凝土的能量耗散特性。研究结果表明：橡胶自密实混凝土的单周疲劳耗散能wd呈现出明显的阶段性，其中，B阶段为主要阶段，且基本保持恒定；同一加载频率下，wd与应力水平呈指数关系；同一应力水平下，加载频率越高，wd越大；在低应力水平时的临界耗散能Wcd大于高应力水平时的临界耗散能，且Wcd随应力水平近似线性降低。此外，提出了一种基于耗散能的橡胶自密实混凝土的疲劳寿命预测方法，并与试验结果进行了对比，验证了该预测方法的有效性。 Abstract: In order to study the fatigue life of rubber self-compacting concrete under cyclic loading, the four-point bending fatigue test of rubber self-compacting concrete was carried out using MTS hydraulic servo testing machine, and the energy dissipation characteristics of rubber self-compacting concrete were analyzed based on the energy method. The results show that the single-cycle fatigue dissipation energy wd of rubber self-compacting concrete presents an obvious three-stage nature, of which the second stage is the main stage and remains basically constant. Under the same loading frequency, wd has an exponential relationship with the stress level, and under the same stress level , the higher the loading frequency, the greater wd. The critical dissipation energy Wcd at low stress levels is greater than the critical dissipation energy at high stress levels, and Wcd decreases approximately linearly with the load level. In addition, a method for predicting the fatigue life of rubber self-compacting concrete based on dissipated energy is proposed and compared with the test results to verify the effectiveness of the prediction method.

英文名 : Study on Fatigue Mechanical Property of Rubber Self-compacting Concrete Based on Energy Dissipation

刊期 : 2021年第6期

关键词 : 橡胶自密实混凝土；疲劳试验；耗散能；力学特性

Key words : Rubber self-compacting concrete; Fatigue test; Energy dissipation; Mechanical property

刊期 : 2021年第6期

DOI : 10.19761/j.1000-4637.2021.06.019.06

文章编号 :

基金项目 : 国家自然科学基金面上项目（51979090）；江苏省自然科学优秀青年基金项目（BK20190075）；中国科协青年人才托举项目（2017QNRC001）。

作者 : 田华轩，陈徐东，陈晨，刘志恒

单位 : 河海大学土木与交通学院，江苏南京 210098

田华轩，陈徐东，陈晨，刘志恒

田华轩,陈徐东,陈晨,等.基于耗散能理论的橡胶自密实混凝土疲劳力学性能研究[J].混凝土与水泥制品,2021(6):19-24.

TIAN H X,CHEN X D,CHEN C,et al.Study on Fatigue Mechanical Property of Rubber Self-compacting Concrete Based on Energy Dissipation[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(6):19-24.

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摘要

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结论

参考文献

引用本文

Abstract: In order to study the fatigue life of rubber self-compacting concrete under cyclic loading, the four-point bending fatigue test of rubber self-compacting concrete was carried out using MTS hydraulic servo testing machine, and the energy dissipation characteristics of rubber self-compacting concrete were analyzed based on the energy method. The results show that the single-cycle fatigue dissipation energy wd of rubber self-compacting concrete presents an obvious three-stage nature, of which the second stage is the main stage and remains basically constant. Under the same loading frequency, wd has an exponential relationship with the stress level, and under the same stress level , the higher the loading frequency, the greater wd. The critical dissipation energy Wcd at low stress levels is greater than the critical dissipation energy at high stress levels, and Wcd decreases approximately linearly with the load level. In addition, a method for predicting the fatigue life of rubber self-compacting concrete based on dissipated energy is proposed and compared with the test results to verify the effectiveness of the prediction method.

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基于耗散能理论的橡胶自密实混凝土疲劳力学性能研究

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