Abstract
Procedures for estimating damage and remaining bearing capacity of RC structures after fire are presented in the paper. The paper describes the effect of fire on structures, the danger it poses for the loss of human lives, and financial losses it may generate. The damage to structural RC elements of a column, beam, slab, wall, and connection details, is presented in the paper. Although RC elements are generally considered to be fire resistant, their physical and mechanical characteristics are greatly influenced by temperature, while the bearing capacity before and after fire can be determined through a number of different methods that are presented in the paper. An overview of condition assessment for RC structures after fire is proposed, and methodology for taking further action is presented.
Highlights
Fire is considered to be one of the main causes of damage to structures and loss of human lives. in 2015, as many as 2685 lives were lost to structural fires in the USA alone, while the related material damage amounted to US$ 10.3 billion [1]
The most often used methods for the repair of RC elements subjected to bending action is the cross section increase method, strengthening by fibre reinforced polymers (FRP), and strengthening by steel plates [54,55,56]
It has been generally acknowledged that wooden or steel structures are greatly affected by fire, laymen often consider that reinforced concrete structures do not burn and, that they can be very little affected by a fire event
Summary
Fire is considered to be one of the main causes of damage to structures and loss of human lives. in 2015, as many as 2685 lives were lost to structural fires in the USA alone, while the related material damage amounted to US$ 10.3 billion [1]. Significant fires with no fatalities that affected buildings belonging to cultural heritage are presented (marked by temple icon on the map). Such accidents (such as Notre Dame, Figure 2) require significant efforts and enormous financial allocations for proper repair of the damage. Elevated temperatures cause change in physical and chemical properties of steel and concrete, which can eventually result in the collapse of the entire structure, and potentially to the loss of human lives. An experimental testing aimed at detecting crack development processes and residual mechanical resistance of concrete after exposure to elevated temperatures was conducted by Xiang et al [9]. Basic processes occurring during increase of temperature in RC structures
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