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中南大学学报(自然科学版)

Journal of Central South University

第47卷    第1期    总第257期    2016年1月

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文章编号:1672-7207(2016)01-0247-07
钢筋混凝土梁疲劳累积损伤过程的等效静力分析方法
王青1, 2, 3,卫军1, 3,刘晓春1, 3,徐港2

(1. 中南大学土木工程学院,湖南长沙,410075;
2. 三峡地区地质灾害与生态环境湖北省协同创新中心,湖北宜昌,443002;
3. 高速铁路建造技术国家工程实验室,湖南长沙,410075
)

摘 要: 为了实现对钢筋混凝土梁疲劳性能的全过程分析和剩余承载力评估,提出一种混凝土构件疲劳累积损伤过程的等效静力分析方法。通过对材料疲劳刚度、强度退化和疲劳残余变形累积发展规律进行分析研究,建立混凝土和钢筋任意加载次数后的疲劳本构模型;基于混凝土材料在静态荷载与疲劳荷载作用下破坏的相似性,构建疲劳荷载与静载作用的等效关系,提出钢筋混凝土构件疲劳性能的等效静力分析方法。采用该方法对某混凝土试验梁进行疲劳性能分析。研究结果表明:所获得的数值模拟结果与实验值变化规律一致,吻合程度良好,验证了该方法的有效性和实用性。

 

关键词: 钢筋混凝土;疲劳本构模型;等效静力分析;数值模拟

Equivalent static analysis method for fatigue cumulativedamage process of reinforced concrete beam
WANG Qing1, 2, 3, WEI Jun1, 3, LIU Xiaochun1, 3, XU Gang2

1. School of Civil Engineering, Central South University, Changsha 410075, China;
2. Collaborative Innovation Center for Geo-hazards and Eco-environment in Three Gorges Area,
Yichang 443002, China;
3. National Engineering Laboratory for High Speed Railway Construction, Changsha 410075, China

Abstract:In order to achieve the full-range analysis and prediction of residual bearing capacity of concrete beams under high-cycle fatigue loading effectively, an equivalent static analysis method for fatigue cumulative damage process of concrete member was proposed. Firstly, according to the rules on stiffness degradation, strength reduction and the accumulation of residual deformation of materials under the fatigue loading, fatigue constitutive model of concrete and reinforced rebar in any cycle of the fatigue load were established. Based on the similarity of concrete behavior under static load and that under fatigue load, the equivalent relation was built. Theequivalent static analysis method for fatigue performance of reinforced concrete member was proposed. A reinforced concrete simple-supported beam was simulated for the fatigue behavior by the method as an example. The results show that the numerical analysis results are consistent with the test results. The effectiveness and practicability are testified.

 

Key words: reinforced concrete; fatigue constitutive model; equivalent static analysis; numerical simulation

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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