基于修正Burgers模型对钢筋混凝土徐变的分析

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (10): 3562-3568.

基于修正Burgers模型对钢筋混凝土徐变的分析

霍晓伟, 盛冬发, 秦飞飞, 柴正一

西南林业大学土木工程学院,昆明 650224

收稿日期:2023-06-21 修订日期:2023-08-01 出版日期:2023-10-15 发布日期:2023-10-17
通信作者: 盛冬发,博士,教授。E-mail:shengdf@swfu.edu.cn
作者简介:霍晓伟(1999—),男,硕士研究生。主要从事混凝土黏弹性的研究。E-mail:huoxiaowei1999@163.com
基金资助:
国家自然科学基金(11862023); 云南省教育厅科学研究基金(2023Y0774)

Analysis of Creep in Reinforced Concrete Based onModified Burgers Model

HUO Xiaowei, SHENG Dongfa, QIN Feifei, CHAI Zhengyi

College of Civil Engineering, Southwest Forestry University, Kunming 650224, China

Received:2023-06-21 Revised:2023-08-01 Online:2023-10-15 Published:2023-10-17

摘要/Abstract

摘要： 为了研究不同配筋率对混凝土徐变性能的影响,本文对素混凝土、8 mm钢筋混凝土和10 mm钢筋混凝土进行了为期350 d的压缩徐变试验。将非线性黏性元件与经典Burgers模型串联,得到了修正Burgers模型。利用不同配筋率混凝土的徐变试验数据,对CEB-FIB(MC90)模型和修正Burgers模型进行拟合计算,从而得到了混凝土徐变拟合曲线。研究结果表明:钢筋能够有效地抑制混凝土的徐变,并且随着配筋率的增加,抑制效果进一步增强;与CEB-FIP(MC90)模型相比,修正Burgers模型的拟合结果更加准确,能更好地预测钢筋混凝土的徐变。

关键词: 修正Burgers模型, 徐变, 钢筋混凝土, 钢筋约束, CEB-FIP模型, Levenberg-Marquardt优化算法

Abstract: In order to examine the effects of different reinforcement ratios on the creep properties of concrete, compression creep tests lasting 350 d were conducted on three types of specimens: plain concrete, 8 mm reinforced concrete, and 10 mm reinforced concrete. A modified Burgers model was developed by introducing a non-linear viscous element in series with the original Burgers model. The creep curves were obtained by fitting both the CEB-FIB (MC90) model and the modified Burgers model using the creep test datas of concrete with various reinforcement. The results indicate that reinforcement effectively mitigates concrete creep, and the mitigation effect becomes more pronounced with the increase of reinforcement ratios. Moreover, the modified Burgers model demonstrates superior accuracy compared to the CEB-FIP (MC90) model and provides better prediction for reinforced concrete creep.

Key words: modified Burgers model, creep, reinforced concrete, reinforcing steel, CEB-FIP model, Levenberg-Marquardt optimization algorithm

中图分类号:

TU375

霍晓伟, 盛冬发, 秦飞飞, 柴正一. 基于修正Burgers模型对钢筋混凝土徐变的分析[J]. 硅酸盐通报, 2023, 42(10): 3562-3568.

HUO Xiaowei, SHENG Dongfa, QIN Feifei, CHAI Zhengyi. Analysis of Creep in Reinforced Concrete Based onModified Burgers Model[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(10): 3562-3568.

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