Reinforced Concrete On The Fire Load Analysis And Simplified Calculation Of The Flexural Member

Reinforced concrete flexural members of the constituent materials of concrete has good fire resistance, and reinforced concrete protective layer has been wrapped, so fire performance is improved. However, in the long-lasting fire, high temperatures, the bearing capacity of reinforced concrete structures will decrease because of its material strength dropped significantly, culminating in the destruction under fire. To ensure that the reinforced concrete flexural members exposed to fire safety, reduce fire losses, fire-resistant design of the building structure, determine the ultimate bearing capacity component is very important.In this paper, reinforced concrete flexural members (ordinary concrete beams, steel reinforced concrete beams, prestressed steel reinforced concrete beams) as the research object, through the action by the fire performance of reinforced concrete beams were analyzed to explore the high temperatures in the fire capacity of reinforced concrete beams calculation method, and then propose an improved capacity calculation. This paper studies the content and main results are as follows:1. Summarized the domestic and reinforced concrete under high temperature mechanical properties and thermal properties of the research results, through a comparative analysis of the literature values select the appropriate calculation parameters required for this article.2.The use of ABAQUS finite element analysis software for reinforced concrete beams under ISO0834standard temperature curve in Fire Simulation Analysis of Temperature Field by different time sections to determine the temperature distribution isotherms and reinforced the position of the temperature.3. Is calculated based on the equivalent cross section of reinforced concrete action by the fire flexural members flexural capacity of normal section proposed three concrete strength under high temperature step model calculation method and the finite element method, the results agree well.4.The high temperature single reinforcement beam reinforced concrete beams with double reinforcement bending capacity of normal section were compared, discussed the configuration of compression reinforcement for ordinary reinforced concrete beam temperature Flexural Capacity factor.