Next Article in Journal
A Building Information Model (BIM) and Artificial Neural Network (ANN) Based System for Personal Thermal Comfort Evaluation and Energy Efficient Design of Interior Space
Previous Article in Journal
Evaluating the Performance of Systemic Innovation Problems of the IoT in Manufacturing Industries by Novel MCDM Methods
Open AccessArticle

Axial Compression Performance of Post-Fire Concrete Columns Strengthened Using Thin-Walled Steel Tubes

by 1,*, 1, 1, 1 and 1,2
1
College of Civil Engineering, Huaqiao University, Xiamen 361021, China
2
College of architecture and civil engineering, Xiamen Institute of Technology, Xiamen 361021, China
*
Author to whom correspondence should be addressed.
Sustainability 2019, 11(18), 4971; https://doi.org/10.3390/su11184971
Received: 24 July 2019 / Revised: 6 September 2019 / Accepted: 6 September 2019 / Published: 11 September 2019
(This article belongs to the Special Issue Sustainable Building Retrofit and Energy Optimization)
For concrete columns damaged by fire, a strengthen technique using thin-walled steel tubes is proposed. To investigate the axial compression capacity of post-fire concrete columns strengthened using thin-walled steel tubes, considering tube thickness, the strengthening method, and section geometry, 12 specimens were fabricated, of which two were control columns and 10 were exposed to fire in accordance with the ISO834 temperature curve. Subsequently, eight specimens were strengthened. Axial compression tests were conducted to provide a better understanding of the strengthening technique. The experiments indicated that: (1) Different failure modes were observed for different cross section geometry—local bucking for square sections, and shear failure for circular sections. (2) The stiffness, axial strength, and ultimate deformation capacity of the enhanced columns may be rehabilitated and even better than the undamaged ones. (3) Two enhancement methods were compared. The steel tubes act as restraints, are merely subjected to tension, and provide strong restraint to the core concrete. The tube carrying load together with the concrete columns are mainly subject to compression, and likely to buckle with longitudinal strain. Finally, axial compressive equations of post-fire reinforced concrete (RC) with thin-wall steel tubes, including both square sections and circle sections, were proposed on the mechanism of concrete filled steel tubes. View Full-Text
Keywords: thin-walled steel tube; strengthening; post-fire; RC column; axial compression thin-walled steel tube; strengthening; post-fire; RC column; axial compression
Show Figures

Figure 1

MDPI and ACS Style

Luo, Y.; Su, J.; Xu, Y.; Ou, T.; Peng, X. Axial Compression Performance of Post-Fire Concrete Columns Strengthened Using Thin-Walled Steel Tubes. Sustainability 2019, 11, 4971.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map

1
Back to TopTop