ACOUSTIC EMISSION CHARACTERISTICS OF CIRCULAR CONCRETE COLUMNS CONFINED BY BFRP TUBE UNDER CORE CONCRETE IMPOSED AXIAL LOADS

WANG Huiqing; ZHANG Dashan; ZHANG Jianchun; HUANG Dongqiang

doi:10.13204/j.gyjzG20050606

Volume 51 Issue 5

Sep. 2021

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WANG Huiqing, ZHANG Dashan, ZHANG Jianchun, HUANG Dongqiang. ACOUSTIC EMISSION CHARACTERISTICS OF CIRCULAR CONCRETE COLUMNS CONFINED BY BFRP TUBE UNDER CORE CONCRETE IMPOSED AXIAL LOADS[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(5): 196-203. doi: 10.13204/j.gyjzG20050606

Citation:

WANG Huiqing, ZHANG Dashan, ZHANG Jianchun, HUANG Dongqiang. ACOUSTIC EMISSION CHARACTERISTICS OF CIRCULAR CONCRETE COLUMNS CONFINED BY BFRP TUBE UNDER CORE CONCRETE IMPOSED AXIAL LOADS[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(5): 196-203. doi: 10.13204/j.gyjzG20050606

Citation:

WANG Huiqing, ZHANG Dashan, ZHANG Jianchun, HUANG Dongqiang. ACOUSTIC EMISSION CHARACTERISTICS OF CIRCULAR CONCRETE COLUMNS CONFINED BY BFRP TUBE UNDER CORE CONCRETE IMPOSED AXIAL LOADS[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(5): 196-203. doi: 10.13204/j.gyjzG20050606

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ACOUSTIC EMISSION CHARACTERISTICS OF CIRCULAR CONCRETE COLUMNS CONFINED BY BFRP TUBE UNDER CORE CONCRETE IMPOSED AXIAL LOADS

doi: 10.13204/j.gyjzG20050606

1. College of Architecture and Civil Engineering, Xiamen Institute of Technology, Xiamen 361021, China;
2. College of Civil Engineering, Huaqiao University, Xiamen 361021, China

Received Date: 2020-05-06
Available Online: 2021-09-16
Publish Date: 2021-09-16

Abstract

Abstract

In order to monitor the damage process of confined concrete elements in buildings and establish an early-warning index to predict the failure status in real-time, four experimental tests of circular concrete columns confined by BFRP (Basalt Fiber Reinforced Polymer) tube (CCCBT) were carried out to collect the acoustic emission signals during the loading condition. Meanwhile, the characteristics of acoustic emission parameters, correlation analysis, and damage index calculation were conducted based on the experimental data. The variation of acoustic emission characteristic parameters of CCCBTs, which had different diameters and reinforcement ratios (with the same pipe thickness), was studied through experiments. It was indicated that the CCCBTs presented different characteristics of acoustic emission at different loading stages. The damage development of CCCBTs with smaller diameter (but with identical thickness) was slower relatively at the early loading stage, and then became faster until that the failure appeared. Through the RA-AF correlation analysis, it was concluded that most of tensile cracks formed at the elastic stage, while the shear cracks appeared mainly at the elastic-plastic stage. All the CCCBTs, whether having inner steel reinforcements or not, were brittle failure mode. However, the CCCBTs with inner steel reinforcements altered the variational features of acoustic emission signals. For this reason, some typical variational features could be chosen to predict the hazard ahead of the failure.
- BFRP tube,
- confined concrete,
- circular column,
- acoustic emission,
- inner damage

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References(20)

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