Experimental Study on Dynamic Mechanical Performance of Post-Fire Concrete Confined by CFRP Sheets-Reference-Cited by-同舟云学术

Experimental Study on Dynamic Mechanical Performance of Post-Fire Concrete Confined by CFRP Sheets

Published:2024-04-28 Issue:9 Volume:17 Page:2076
ISSN:1996-1944
Container-title:Materials
language:en
Short-container-title:Materials

Author:

Liu Jingya¹,Huo Jingsi²,Wang Haitao³⁴,Tang Zhongping¹,Zhang Qingyan¹,Yi Shixiang¹

Affiliation:

1. Institute of Structural Material Failure and Strengthening Technology, Ningbo Polytechnic, Ningbo 315800, China

2. Fujian Provincial Key Laboratory of Intelligent Infrastructure and Monitoring, Huaqiao University, Xiamen 361021, China

3. College of Civil and Architecture Engineering, Chuzhou University, Chuzhou 239000, China

4. Engineering Research Center of Low-carbon Highway Building Materials of Anhui Province, Chuzhou 239000, China

Abstract

Impact tests on post-fire concrete confined by Carbon Fiber-Reinforced Polymer/Plastic (CFRP) sheets were carried out by using Split Hopkinson Pressure Bar (SHPB) experimental setup in this paper, with emphasis on the effect of exposed temperatures, CFRP layers and impact velocities. Firstly, according to the measured stress-strain curves, the effects of experiment parameters on concrete dynamic mechanical performance such as compressive strength, ultimate strain and energy absorption are discussed in details. Additionally, temperature caused a softening effect on the compressive strength of concrete specimens, while CFRP confinement and strain rate play a hardening effect, which can lead to the increase in dynamic compressive strength by 1.8 to 3.6 times compared to static conditions. However, their hardening mechanisms and action stages are extremely different. Finally, nine widely accepted Dynamic Increase Factor (DIF) models considering strain rate effect were summarized, and a simplified model evaluating dynamic compressive strength of post-fire concrete confined by CFRP sheets was proposed, which can provide evidence for engineering emergency repair after fire accidents.

Funder

2022 Construction Research Project (self-funded) of Zhejiang department of housing and urban rural construction

2023 Social Investment Construction Scientific Research Project of Ningbo

National Engineering Laboratory for Applied Technology of Forestry & Ecology in South China

Chuzhou University

Publisher

MDPI AG

Link

https://www.mdpi.com/1996-1944/17/9/2076/pdf

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