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中南大学学报(自然科学版)

Journal of Central South University

第48卷    第2期    总第270期    2017年2月

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文章编号:1672-7207(2017)02-0506-06
配筋对混凝土徐变的影响分析
曹国辉1,阳亮2,张锴1,彭细荣1

(1. 湖南城市学院 土木工程学院,湖南 益阳,413000;
2. 湖南大学 土木工程学院,湖南 长沙,410082
)

摘 要: 基于龄期调整的有效模量法和内力重分布机理,引入钢筋修正系数预测钢筋混凝土的徐变并且推导出相应的计算公式。通过对相关数据进行拟合分析,验证钢筋修正系数的有效性和实用性。在此基础上,提出基于现行公路桥涵设计规范徐变模型的配筋混凝土徐变计算公式,并分析老化系数、配筋率、加载龄期等参数对徐变的影响。研究结果表明:配筋对混凝土徐变具有抑制作用;当配筋率很小时,配筋对混凝土的相对抑制作用最强,随着配筋率增大,相对抑制作用逐渐降低;加载龄期和配筋对混凝土徐变的影响有叠加作用,并且这种叠加作用不只是简单的线性叠加。

 

关键字: 钢筋混凝土柱;徐变;钢筋修正系数;基于龄期调整的有效模量法;配筋率

Analysis of reinforcement influence on concrete creep
CAO Guohui1, YANG Liang2, ZHANG Kai1, PENG Xirong1

1. College of Civil Engineering, Hunan City University, Yiyang 413000, China;
2. College of Civil Engineering, Hunan University, Changsha 410082, China

Abstract:Based on the age-adjusted effective modulus method (AEMM) and internal force redistribution mechanism, the reinforced correction coefficient was introduced to predict the creep of reinforced concrete and deduce the corresponding calculation formula. The validity and practicability of the reinforced correction coefficient were verified by fitting analysis of the related data. The calculation formula of reinforced concrete creep based on the current code for design of highway reinforced concrete and prestressed concrete bridges and culverts were proposed. Furthermore, the effects of different parameters such as aging coefficient, reinforcement ratio and loading age were analyzed. The results show that reinforcement exerts the inhibitory effect on concrete creep. The inhibitory effect is the strongest when the reinforcement ratio is small and it gradually weakens when the reinforcement ratio increases. Loading age and reinforcement exert additive influences on concrete creep, which is not a simple linear superposition.

 

Key words: reinforced concrete column; creep; reinforced correction coefficient; AEMM method; reinforcement ratio

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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