Fracture Characteristics and Numerical Simulation of Foamed Concrete Beams of Different Densities

被引：0

作者：

Chen X. ^{[1
,2
]}

Feng L. ^{[2
]}

Zhang J. ^{[3
,4
]}

Liu Z. ^{[2
]}

Dong W. ^{[5
]}

Wen R. ^{[2
]}

机构：

[1] Key Laboratory of C & PC Structures, Ministry of Education, Southeast University, Nanjing

[2] College of Civil and Transportation Engineering, Hohai University, Nanjing

[3] Engineering Research Center of Safety and Protection of Explosion & Impact of Ministry of Education (ERCSPEIME), Southeast University, Nanjing

[4] School of Civil Engineering, Southeast University, Nanjing

[5] Unit 96901, Beijing

来源：

Cailiao Daobao/Materials Reports | 2022年 / 36卷 / 04期

基金：

中国国家自然科学基金;

关键词：

Density; Extended finite element method (XFEM); Foamed concrete (FC) beams; Fracture characteristics; Loading rate effect;

D O I：

10.11896/cldb.20090086

中图分类号：

学科分类号：

摘要：

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. © 2022, Materials Review Magazine. All right reserved.

引用

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