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作者:

Yu, Wenxuan (Yu, Wenxuan.) | Xie, Chenxi (Xie, Chenxi.) | Jin, Liu (Jin, Liu.) (学者:金浏) | Du, Xiuli (Du, Xiuli.)

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EI Scopus SCIE

摘要:

In this study, a three-dimensional mesoscopic numerical model considering concrete heterogeneity and explicit modelling of basalt fibers was established to simulate the static and dynamic split-tensile failures of basalt fiber-reinforced lightweight aggregate concrete (BFLAC), with a special focus on the influences of structure sizes (D = 100, 200, 300 and 400 mm), basalt fiber contents (V-f = 0.1 %, 0.2 % and 0.3 %), fiber lengths (L-f = 6, 12, 18, 24 mm) and loading strain rates (epsilon = 10(-5)/s similar to 100/s) on split-tensile failure patterns, deformation characteristic and failure strengths. Simulation results indicate that as the fiber length increases, split-tensile strength of BFLAC enhances first and then remains unchanged. As the fiber content increases, both static and dynamic split-tensile strengths enhance, showing a fiber reinforcement effect which increases with the rising strain rate rise and reaches a threshold when the strain rate exceeds 1/s. Under static and low strain rates, the size effect on split-tensile strength of BFLAC is reduced by the addition of basalt fiber content; while there is a reverse size effect under high strain rates and it is strengthened with the increasing fiber content. Besides, the strain rate effect of BFLAC is stronger with the increasing basalt fiber content. A unified TDIF formula of BFLAC considering the influence of basalt fiber content was proposed, which can provide a valuable reference for the dynamic performance simulations and calculations.

关键词:

Basalt fiber-reinforced lightweight aggregate Strain rate effect Fiber content and length concrete Dynamic increase factor Fiber reinforcing effect Size effect

作者机构:

  • [ 1 ] [Yu, Wenxuan]Beijing Univ Technol, Key Lab Urban Secur & Disaster Engn, Minist Educ, Beijing 100124, Peoples R China
  • [ 2 ] [Xie, Chenxi]Beijing Univ Technol, Key Lab Urban Secur & Disaster Engn, Minist Educ, Beijing 100124, Peoples R China
  • [ 3 ] [Jin, Liu]Beijing Univ Technol, Key Lab Urban Secur & Disaster Engn, Minist Educ, Beijing 100124, Peoples R China
  • [ 4 ] [Du, Xiuli]Beijing Univ Technol, Key Lab Urban Secur & Disaster Engn, Minist Educ, Beijing 100124, Peoples R China
  • [ 5 ] [Yu, Wenxuan]Tsinghua Univ, Dept Hydraul Engn, Beijing 100084, Peoples R China

通讯作者信息:

  • [Jin, Liu]Beijing Univ Technol, Key Lab Urban Secur & Disaster Engn, Minist Educ, Beijing 100124, Peoples R China;;

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来源 :

ENGINEERING FRACTURE MECHANICS

ISSN: 0013-7944

年份: 2023

卷: 295

5 . 4 0 0

JCR@2022

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