Infrastructure Engineering - Theses

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End date: 2009 × Subject: concrete structure × Subject: high strength concrete ×

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    Performance of high strength concrete walls subjected to fire
    TA, THANH BINH ( 2009)
    Hydrocarbon fires can cause severe damage to building structures. Recent terrorist attacks and other accidental events around the world have shown the urgent need for research into this problem. Concrete structures exposed to fire break away explosively or fall-off during the course of rapid high temperature exposure. This phenomenon is called “spalling”. This thesis presents the results of experimental and theoretical investigations into the behaviour of normal strength concrete (NSC) and high-strength concrete (HSC) walls subjected to both ISO 834 standard fire and hydrocarbon fire curves. The research was divided into four parts: Review of the concrete material and concrete walls behaviour in fire conditions; (b) Experimental programs consisting of the half full scale concrete walls fire test; (c) Development of thermal and structural model for modeling HSC walls subject to loads and fire; (d) Validation of the computer modeling and numerical applications. The main objective of the experimental programs is to obtain research data in both the NSC and HSC walls subjected to ISO834 standard fire and hydrocarbon fire curves. Several concrete panels 1000x2400x100mm were tested in the Institution of Building Science and Technology Labs (IBST) in Vietnam to investigate the fire performance of NSC and HSC walls under hydrocarbon fire conditions. Fire tests were conducted on different types of concrete with compressive strengths varying from 34 MPa to 89 MPa. The experimental program covered the thermal transfer inside concrete panels, the displacements of these panels, spalling and the overall behaviour of those walls in fire. After testing, the spalling was measured and analysed. Thermal test data were analysed to obtain the temperature-time relationships and other factors affecting the behaviour of concrete specimens without axial load or under eccentric axial compression. The results showed that spalling in HSC is more significant when subjected to hydrocarbon fire compared to NSC. The level of compressive load on the panels was also found to have a significant effect on the fire performance of the HSC panels.