[1]李自林,邢颖,韩庆华,等.弹性混凝土与钢组合梁的疲劳性能分析及寿命预测[J].东南大学学报(自然科学版),2015,45(1):165-171.[doi:10.3969/j.issn.1001-0505.2015.01.029]
　Li Zilin,Xing Ying,Han Qinghua,et al.Fatigue behavior analysis and life prediction of elastic concrete and steel composite beam[J].Journal of Southeast University (Natural Science Edition),2015,45(1):165-171.[doi:10.3969/j.issn.1001-0505.2015.01.029]
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弹性混凝土与钢组合梁的疲劳性能分析及寿命预测()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
45
期数:
2015年第1期
页码:
165-171
栏目:
土木工程
出版日期:
2015-01-20

文章信息/Info

Title:
Fatigue behavior analysis and life prediction of elastic concrete and steel composite beam
作者:
李自林1; 2; 邢颖1; 韩庆华1; 3; 郭琪1
1天津大学建筑工程学院, 天津300072; 2天津城建大学天津市软土特性与工程环境重点实验室, 天津300384; 3天津大学滨海土木工程结构与安全教育部重点实验室, 天津300072
Author(s):
Li Zilin1; 2;  Xing Ying1;  Han Qinghua1; 3;  Guo Qi1
1 School of Civil Engineering, Tianjin University, Tianjin 300072, China
2 Tianjin Key Laboratory of Soft Soil Characteristics and Engineering Environment, Tianjin Institute of Urban Construction, Tianjin 300384, China
3 Key Laboratory of Coast Civil Structure Safety of Ministry of Education, Tianjin University, Tianjin 300072, China
关键词:
组合结构;  数值模拟;  疲劳性能;  弹性混凝土;  疲劳寿命;  应力集中系数
Keywords:
composite structure;  numerical simulation;  fatigue behavior;  elastic concrete;  fatigue life;  stress concentration factor
分类号:
TU398
DOI:
10.3969/j.issn.1001-0505.2015.01.029
摘要:
基于8个组合梁试件的疲劳试验结果,采用有限元计算与名义应力法相结合的方法,提出用于模拟滑移和疲劳破坏过程的精细有限元模型和计算方法.研究了混凝土中不同橡胶掺量对组合梁极限承载力、最大滑移、栓钉应力及破坏特征的影响,得到相应的应力-疲劳寿命曲线.结果表明,简支组合梁的疲劳破坏首先发生在端部栓钉,破坏过程为栓钉依次断裂.虽然疲劳断裂为脆性破坏,但组合梁在疲劳荷载作用下的整体破坏具有一定的延性.使用弹性混凝土代替普通混凝土后,组合梁的极限承载力和刚度略有降低,但延性有所提高;当橡胶掺量为5%,10%和15%时,疲劳寿命分别提高约15%,64%和125%.基于非线性数值分析得到的组合梁极限承载力和疲劳寿命与试验所测结果吻合较好,为组合梁的抗疲劳设计提供了参考.
Abstract:
Based on the results of fatigue experiments of eight composite beams, a fine finite element model and a calculation method applied for simulating slip and fatigue failure process are proposed by using the method combining finite element calculation with nominal stress approach. The effects of the different rubber contents in concrete on the ultimate bearing capacity, maximum slip, stress of stud and failure characteristics of composite beams are studied, and the corresponding stress-fatigue life curves are obtained. The results show that fatigue failure of simply supported composite beam first occurs at the end stud, and spreads in proper order. Although fatigue break is brittle failure, the general demolition of composite beams under fatigue loads has some ductility. After replacing normal concrete by elastic concrete, the ultimate bearing capacity and stiffness of composite beams decreases slightly while the ductility increases. The fatigue life increases by about 15%, 64% and 125% when the volumetric fractions of rubber are 5%, 10% and 15%, respectively. The ultimate bearing capacity and fatigue life evaluated by nonlinear numerical analysis agree well with those obtained by the fatigue tests, providing valuable references for the fatigue resistant design of composite beams.

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备注/Memo

备注/Memo:
收稿日期: 2014-06-18.
作者简介: 李自林(1953—),男,教授,博士生导师;韩庆华(联系人),男,博士,教授,博士生导师,qhhan@tju.edu.cn.
基金项目: 国家自然科学基金资助项目(51178307,51408408)、天津市自然科学基金资助项目(13JCBJC19600).
引用本文: 李自林,邢颖,韩庆华,等.弹性混凝土与钢组合梁的疲劳性能分析及寿命预测[J].东南大学学报:自然科学版,2015,45(1):165-171. [doi:10.3969/j.issn.1001-0505.2015.01.029]
更新日期/Last Update: 2015-01-20