不同密度泡沫混凝土梁断裂特性及数值模拟

doi:10.11896/cldb.20090086

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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

Published: 25 February 2022 Online: 2022-02-28

CLC number:

TU528.01

Fund:(2017QNRC001);中央高校基本科研业务费专项资金资助(B200202076)National Natural Science Foundation of China (51979090), the Natural Science Foundation for Excellent Young Scholars of Jiangsu Province (BK20190075), China Association for Science and Technology Youth Talent Promotion Project (2017QNRC001), the Fundamental Research Funds for the Central Universities (B200202076).

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	Articles by authors
	CHEN Xudong
	FENG Lu
	ZHANG Jinhua
	LIU Zhiheng
	DONG Wen
	WEN Rongkun

Cite this article:

CHEN Xudong,FENG Lu,ZHANG Jinhua, et al. Fracture Characteristics and Numerical Simulation of Foamed Concrete Beams of Different Densities[J]. Materials Reports, 2022, 36(4): 20090086-7.

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http://www.mater-rep.com/EN/10.11896/cldb.20090086 OR http://www.mater-rep.com/EN/Y2022/V36/I4/20090086

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