Труды Кубанского государственного аграрного университета


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2016, № 63

UDC: 624.01(075.8)
GSNTI: 67.29

Structural damage to buildings and structures at high temperatures

The results of the action of high temperatures in the construction of buildings and structures are studied, presented and analyzed. The preservation of the bearing capacity of buildings and structures under high temperatures of great intensity and duration has been investigated and analyzed. By this the performance of designs, material strength, the strength of adhesion with the reinforced concrete, the size of the working section are reduced. Because of the uneven elements heating the design scheme of elements working as a part of continuous systems is changed. The concrete strength decreases and reinforcement plasticity in the concrete increases. As a result, the bent elements receive unacceptable deflections and excessive open cracks, and the eccentrically compressed elements become unstable, decreasing the modulus of elasticity of reinforcement in concrete. We have established the extent of damage of concrete constructions after the fire. Based on the obtained data we have conducted an analysis allowing us to make decisions on the repair and strengthening of structures. Constructions having a slight degree of damage, undergo cosmetic repair, with moderate structural damage cvonstructions must be repaired by injecting cracks, or build-up of concrete section. With a strong degree of damage it is necessary to strengthen the structure by introducing additional support, capacity-section of concrete and rebar, or other methods of providing strength and rigidity. When the full extent of structural damage state the condition of structures is an emergency and remediation is inappropriate. The reinforced concrete structures have been studied and the surface heating temperature has been determined, as well as the strength of concrete and rebar has been evaluated.In conducting the studies we used two methods of determining the calculated fire parameters: experimental and theoretical.
Keywords: Building, temperature, load, reinforcement, concrete, mode, fire
DOI: 10.21515/1999-1703-63-184-190

References:

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Authors:

  1. Rudchenko Ivan Ivanovich, PhD of technical Sciences, associate Professor, I.T. Trubilin Kuban State Agrarian University.
  2. Bugriev Maxim Petrovich, student, I.T. Trubilin Kuban State Agrarian University.