Compressive Strength of Post Fire Exposed Concrete Column Wrapped with Fiber Reinforced Polymer

Dwi Agus Setiawan Wardaya, Handoko Sugiharto, Pamuda Pudjisuryadi




Abstract


In this study, behaviour of reinforced concrete columns strengthened using fiber reinforced polymer (FRP; glass fiber and carbon fiber) after fire exposure are discussed. After being exposed to fire as high as 720oC for 180 minutes, the specimens showed concrete and  reinforcement strength degradation, even though there was no carbonation. It was found that specimens wrapped by carbon fiber showed better compressive strength but less ductility compared to specimens wrapped by glass fiber. It was also found that the low initial compressive strength did not decrease FRP confinement effectiveness. Increase of wrapped concrete com­pressive strength was evident despite the low initial strength (<17 MPa). Strength esti­mation using ACI 440.2R-08 formula, which is originally for wrapped plain concrete without fire heat exposure, underestimated the compressive strength. In the proposed formula, the initial compressive strength (f’co) should be adjusted by considering the modulus elasticity and strain limitation to have more precise estimation.

 


Keywords


Curing; fire exposed concrete column; fiber reinforced polymer.

References


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Lee, C.S., Hegemier, G.A., and Phillippi, D.J., Analytical Model for Fiber Reinforced Polymer Jacketed Square Concrete Columns in Axial Compression, ACI Structural Journal, 107(2), 2010, pp. 208–217. [CrossRef]

ACI 440.2R-08, Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures, American Concrete Institute, 2008. [CrossRef]

Bisby, L.A., Chen, J.F., Li, S.Q., Stratford, T.J., Cueva, N., and Crossling, K., Strengthening Fire Damaged Concrete by Confinement with Fiber-Reinforced Polymer Wraps, Engineering Structures, 33(12), 2011, pp. 3381–3391. [CrossRef]

Wardaya, D.A.S., Analisa Rumus Empiris Kuat Tekan Kolom dengan Penggunaan Fiber Reinforced Polymer pada Kondisi: Non Fire exposed, Fire exposed-Curing, dan Fire exposed Non Curing, Unpublished Graduate Theses, Petra Christian University, 2016. [CrossRef]

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Badan Standarisasi Nasional, SNI 03-1736-2000: Tata Cara Perencanaan Sistem Proteksi Pasif Untuk Pencegahan Bahaya Kebakaran pada Bangunan Rumah dan Gedung, 2000. [CrossRef]


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