Study on Buildup the Properties of R.C.C. Structures against Fire

Fire remains one of the serious potential risks to most buildings and structures. Since concrete is widely used in construction, research on fire resistance of concrete becomes more and more important. Many researchers all over the world have done some researches on this subject. The mechanical properties of all common building materials decrease with elevation of temperature. The behavior of a reinforced concrete structure in fire conditions is governed by the properties of the constituent materials, concrete, and steel, at high temperature. Both concrete and steel undergo considerable change in their strength, physical properties, and stiffness by the effects of heating, and some of these changes are not recoverable after subsequent cooling. The mechanical properties of steel deteriorate by heat during fires, and the yield strength of conventional steel at 600-°C is less than 1/3 of the specified yield strength at room temperature. Therefore, conventional steels normally require fire-resistant coating to be applied. The temperature increase in the steel member is governed by the principles of heat transfer. Consequently, it must be recognized that the temperature of the steel member(s) will not usually be the same as the fire temperature in a compartment or in the exterior flame plume. Protected steel will experience a much slower temperature rise during a fire exposure than unprotected steel. Also, fire effect on steel member is influenced with its distance from the center of the fire, and if more ventilation occurs near the steel in a fuel-controlled condition, wherein the ventilation helps to cool the steel by dissipating heat to the surrounding environment. Even once a protracted amount, the interior temperature of concrete remains comparatively low; this allows it to retain structural capability and hearth shielding properties as a separating part. Amul Singh"Study on Buildup the Properties of R.C.C. Structures against Fire" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-3 , April 2018, URL: http://www.ijtsrd.com/papers/ijtsrd11575.pdf http://www.ijtsrd.com/engineering/civil-engineering/11575/study-on-buildup-the-properties-of-rcc-structures-against-fire/amul-singh