| It is a topic of general interest that how the mechanic performance of the structure has changed after the building fire. When building structures expose to fire loads, structural temperature, deflection and interior force will result in continual changes, which is rather complicated. However, the effects of fire on building are rather complicated and still unsolved so far.Many investigations on the high temperature behavior of concrete have been reported. The results reported are not easy to compare quantitatively with each other, because of differences in the materials used and the test conditions. In addition, information on the high temperature behavior of reinforcing bars is limited. To establish a database of material properties of concrete and steel bars at high temperatures, several series of material tests were carried out for this study. The results obtained are summarized concisely for use in nonlinear heat transfer analysis and thermal elastic-plastic analysis. In the tests, the physical properties and mechanical properties were measured.The essential properties and ultimate collapse of a reinforced concrete beam during a fire hazard is studied in this paper. And the calculation method for the normal section bearing capacity of a reinforced concrete beam is provided. The section of a beam is dispersed by the concretely method. And making use of the finity elements software ANSYS analyses the temperature field of the beam. Then, to result the temperature distribution of the section under a certain high temperature time in the standardly calefactive fire condition, ensure the resisting pressure intension of an arbitrary cell of the section and the yield intension. The... |
