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材料导报  2022, Vol. 36 Issue (4): 20090086-7    https://doi.org/10.11896/cldb.20090086
  无机非金属及其复合材料 |
不同密度泡沫混凝土梁断裂特性及数值模拟
陈徐东1,2, 冯璐2, 张锦华3,4,*, 刘志恒2, 董文5, 温荣鲲2
1 东南大学混凝土及预应力混凝土教育部重点实验室,南京 210096
2 河海大学土木与交通学院,南京 210098
3 东南大学爆炸安全防护教育部工程研究中心,南京 211189
4 东南大学土木工程学院,南京 211189
5 96901部队,北京 100089
Fracture Characteristics and Numerical Simulation of Foamed Concrete Beams of Different Densities
CHEN Xudong1,2, FENG Lu2, ZHANG Jinhua3,4,*, LIU Zhiheng2, DONG Wen5, WEN Rongkun2
1 Key Laboratory of C & PC Structures, Ministry of Education, Southeast University, Nanjing 210096, China
2 College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China
3 Engineering Research Center of Safety and Protection of Explosion & Impact of Ministry of Education (ERCSPEIME), Southeast University, Nanjing 211189, China
4 School of Civil Engineering, Southeast University, Nanjing 211189, China
5 Unit 96901, Beijing 100089, China
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摘要 为探究泡沫混凝土(Foamed concrete,FC)梁的断裂特性和裂缝扩展过程,采用不同密度和不同初始缝高比的试件,开展不同加载速率下的三点弯断裂试验。结果表明,FC梁的抗弯承载力具有加载速率效应,其峰值荷载随加载速率的上升而增大。但加载速率效应随FC密度的增长逐渐减弱,且初始缝高比越大,加载速率效应越不明显。FC梁抗弯承载力随密度的减小而下降,但其抵抗变形的能力增强。利用ABAQUS建立FC梁的有限元模型,借助扩展有限元方法(Extended finite element method,XFEM)模拟FC梁的裂缝扩展过程,得到其断裂过程的荷载-裂缝张口位移(P-CMOD)曲线。结果表明,数值模拟的结果与试验结果吻合良好,验证了XFEM的合理性和精确性。FC梁在达到峰值荷载前的裂缝开展形式主要为拉伸裂缝,达到峰值荷载后,裂缝进入失稳扩展阶段,剪切裂缝逐渐增多。
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陈徐东
冯璐
张锦华
刘志恒
董文
温荣鲲
关键词:  泡沫混凝土(FC)梁  扩展有限元方法(XFEM)  断裂特性  密度  加载速率效应    
Abstract: To investigate the fracture characteristics and crack propagation of foamed concrete (FC) beams, three-point bending fracture tests under different loading rates were carried out on specimens with different densities and initial crack-depth ratios. The results indicate the flexural bea-ring capacity of FC beams has a loading rate effect, which increases with the enhancement of loading rate. However, the loading rate effect decreases with the rise of density, and the larger the initial crack-depth ratio, the less significant the loading rate effect. The flexural bearing capacity declines with the decrease of density, but its ability to resist deformation is enhanced. The finite element models of FC beams were established with ABAQUS. The extended finite element method (XFEM) was used to simulate the crack propagation of FC beams, and the load-crack mouth opening displacement (P-CMOD) curves of the fracture process were obtained. The results indicate the numerical simulation agrees well with the experimental data, which verifies the rationality and accuracy of XFEM. The crack development patterns of FC beams before reaching the peak load are mainly tensile cracks. After reaching the peak load, cracks enter the instability development stage, and shear cracks gradually increase.
Key words:  foamed concrete (FC) beams    extended finite element method (XFEM)    fracture characteristics    density    loading rate effect
出版日期:  2022-02-25      发布日期:  2022-02-28
ZTFLH:  TU528.01  
基金资助: 国家自然科学基金项目(51979090); 江苏省自然科学优秀青年基金项目(BK20190075); 中国科协青年人才托举项目
通讯作者:  zjh796038@163.com   
作者简介:  陈徐东,河海大学土木与交通学院结构工程研究所,青年教授。2014年7月毕业于河海大学,获得工学博士学位。主要从事混凝土动态损伤机理和动力特性,混凝土疲劳破坏机制与裂缝扩展机理等方面的研究。在国内外期刊以第一或通讯作者发表论文共80多篇,授权发明专利18项。
张锦华,东南大学爆炸安全防护教育部工程研究中心,副教授。2015年7月毕业于解放军理工大学,获得工学博士学位。主要从事细观力学及其在防护工程中的应用,工程材料与结构抗冲击爆炸的计算理论与方法等研究。发表学术论文50余篇,获授权专利及软件著作权10余项。
引用本文:    
陈徐东, 冯璐, 张锦华, 刘志恒, 董文, 温荣鲲. 不同密度泡沫混凝土梁断裂特性及数值模拟[J]. 材料导报, 2022, 36(4): 20090086-7.
CHEN Xudong, FENG Lu, ZHANG Jinhua, LIU Zhiheng, DONG Wen, WEN Rongkun. Fracture Characteristics and Numerical Simulation of Foamed Concrete Beams of Different Densities. Materials Reports, 2022, 36(4): 20090086-7.
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http://www.mater-rep.com/CN/10.11896/cldb.20090086  或          http://www.mater-rep.com/CN/Y2022/V36/I4/20090086
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