The Spalling Influence Research On Fire Resistance Of Eccentric Compression Column

Full-scale fire resistance test is the important method to study fire resistance.There are few achievements on fire resistance test of ordinary concrete columns with different moisture content in different curing cycles.In some coastal areas of fire,especially by the sea breeze,structural concrete is affected by humid environment.Internal moisture content is high and fire is very easy to burst,causing serious impact on structure.In summary,designed three different moisture content of the curing cycle,the two forms of force a total of six full-size concrete specimens,detailed studies were carried out by fire tests:1)Summarized the research status and conclusion of fire-resisting of reinforced concrete columns,a fire test scheme was proposed and designed to solve the problem of high temperature burst.2)The mechanical properties of reinforced concrete and concrete under high temperature are comprehensively summarized,and the research results are analyzed.3)Three typical axial compression concrete columns and three ordinary concrete columns with biased compression are designed to carry out fire resistance test,in order to analyze the moisture content and the form of stress affected by the difference in temperature.4)Summarizes the different water content caused by the degree of bursting and different forms of stress caused by the characteristics of cracks and other laws.5)Obtained the temperature rise of concrete and steel tendencies,the maximum temperature,and high-temperature concrete within the water vapor "drying effect" and other conclusions.6)Compared six groups of fire test displacement changes to study the variation of vertical displacement of different members in fire test as well as the effect of burst and force on fire resistance.