考虑尺寸效应影响的预应力混凝土梁疲劳受弯刚度退化研究

周宏宇; 周运; 刘亚南; 唐琪

doi:10.13204/j.gyjzG20100604

考虑尺寸效应影响的预应力混凝土梁疲劳受弯刚度退化研究

doi: 10.13204/j.gyjzG20100604

北京工业大学建筑工程学院, 北京 100124

基金项目:

国家自然科学基金面上项目(51978012)

北京市自然科学基金京津冀合作专项项目(J160002)。

详细信息

作者简介:
周宏宇,男,1976年出生,博士,高级实验师。电子信箱:zhouhy@emails.bjut.edu.cn

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- 被引次数: 0
出版历程
- 收稿日期: 2020-10-06
- 网络出版日期: 2022-03-29

RESEARCH ON BENDING STIFFNESS DEGRADATION OF PRESTRESSED CONCRETE BEAMS CONSIDERING SIZE EFFECT

1.College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China

摘要

摘要: 基于混凝土疲劳损伤发展规律和截面刚度损伤模型,同时考虑普通钢筋和预应力钢筋受疲劳荷载作用后裂纹扩展的情况,采用损伤弹性模量和非线性损伤累积准则描述混凝土损伤,采用有效截面面积反映钢筋疲劳损伤,引入尺寸效应修正系数进一步推导疲劳损伤后预应力混凝土梁截面刚度退化的计算模型。通过分析多级变幅疲劳循环荷载下不同尺寸预应力混凝土梁构件试验研究结果,验证了刚度退化模型的准确性。试验结果表明:多级变幅疲劳加载试验下预应力混凝土梁刚度退化和混凝土损伤发展有着类似的规律;并且理论推导算式的刚度计算结果与试验实测结果偏差较小。
- 预应力 /
- 尺寸效应 /
- 疲劳损伤 /
- 多级变幅 /
- 刚度退化
Abstract: Based on the development law of fatigue damage of concrete and the section stiffness damage model, the crack propagation of ordinary rebars and prestressed rebars after being subjected to fatigue loads was considered. The damage elastic modulus and nonlinear damage accumulation criteria were used to describe concrete damage, and the effective cross-sectional area was used to reflect the fatigue damage of steel bars. The correction factor of size effect was introduced to further deduce the calculation model of the stiffness degradation of the prestressed concrete beam after being subjected to fatigue damage. The accuracy of the stiffness degradation model was verified by analyzing the experimental research results of prestressed concrete beams in different sizes under cyclically multi-level variable-amplitude loads. The test results showed that the stiffness degradation of prestressed concrete beams and the development of concrete damage under the multi-stage variable-amplitude loading test had similar laws; the calculation results of stiffness by the theoretical deduction formulas had a little deviation from the experimental results.
- prestress /
- size effect /
- fatigue damage /
- multi-stage variable-amplitude /
- stiffness degradation

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参考文献(17)

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