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Numerical Analysis on Dynamic Response of CFRP-Wrapped RC Columns under Lateral Impact Loading
Tao Liu1, Xiaoqing Xu1, Lin Chen1
1School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China.
Materials (Basel, Switzerland)
|March 29, 2023
Summary
Carbon-fiber-reinforced polymer (CFRP) wraps enhance reinforced concrete (RC) column resistance to lateral impact by controlling shear damage in Stage-II. Impact velocity significantly affects RC column dynamic response, with CFRP strengthening becoming crucial during later impact stages.
Area of Science:
- Structural Engineering
- Materials Science
- Computational Mechanics
Background:
- Reinforced concrete (RC) columns are critical structural elements susceptible to damage from lateral impact.
- Carbon-fiber-reinforced polymer (CFRP) wraps offer a promising retrofitting solution for enhancing structural resilience.
- Understanding the dynamic response and failure mechanisms of strengthened columns under impact is crucial for safety.
Purpose of the Study:
- To numerically investigate the dynamic response and resistance mechanisms of RC columns strengthened with CFRP under lateral impact.
- To validate finite element (FE) models against experimental data for accurate simulation of impact events.
- To analyze the influence of various parameters on the performance of both plain and strengthened RC columns.
Main Methods:
- Development and validation of finite element (FE) models using LS-DYNA software, based on existing experimental data.
- Numerical simulation of reinforced concrete (RC) columns with and without carbon-fiber-reinforced polymer (CFRP) wraps.
- Parametric studies focusing on axial compression ratio, boundary conditions, CFRP layers, impact velocity, and impact height.
Main Results:
- FE models demonstrated high accuracy in simulating the dynamic response of RC columns compared to experimental results.
- CFRP strengthening was found to be effective in controlling shear damage during Stage-II of the impact event.
- Impact velocity was identified as the most sensitive parameter influencing the dynamic response of both plain and CFRP-strengthened columns.
Conclusions:
- CFRP retrofitting significantly improves the shear resistance and damage control of RC columns under lateral impact.
- The effectiveness of CFRP strengthening is most pronounced in the later stages of impact, influencing shear force and moment distribution.
- Impact velocity is a critical factor determining the dynamic response and failure modes of RC columns, irrespective of CFRP application.
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