The structural response of reinforced concrete continuos beams exposed to standard fire test will be analyzed in this paper. Deformations, stresses, initialization and development of cracks, crushing of concrete, as well as consequent stiffness and strength reductions in reinforced concrete elements will be determinate at small time intervals during a fire. To solve this problem two separate computer programs will be used. The program TERMIKA, developed by the authors of this paper, carries out the nonlinear transient heat flow analysis associated with fire. The second computing module FIRE, which is a modification of FIRES-RC program, predicts the response of reinforced concrete elements subjected to the thermal histories predicted by TERMIKA. The beams analyzed in this paper are exposed to a standard fire only from the lower side. At the upper side they are a part of a reinforced concrete slab which is not fire exposed. Different fire scenario are analyzed in cases of continuos beams. For a given specific loading, element geometry and support condition, the fire resistance is defined as a time when plastic hinges are formed and the element has lost its strength.

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