Elastic-plastic Stability Analysis Of Steel Structure Compressive Bar Under High Temperature

Steel structure itself has the advantage of high strength,light weight,good plastic toughness,and the construction progress fast period time is short,less environmental pollution,and the structure of the form is flexible,high seismic performance,reliability,thus has been widely applied in engineering.But the lack of its refractory performance is one of its insurmountable shortcomings.Elastic modulus and strength of the steel at high temperatures,such as the basic mechanics performance index dropping fast,if there is a fire occurs,damage the structure,eventually lead to overall building collapsed,along with the increase of the escape from difficulty in personnel also to add to the difficulties,fire work building after the fire is difficult to repair,repair cost huge sums,indirectly increased the economic loss.In this paper,the high temperature of steel members under axial compression is analyzed,mainly including the following contents:The first chapter mainly discusses the fire the damage to human beings and the impact on the building of steel components;Axial compression member introduces the steel structure in domestic and foreign research present situation and the development level of;Elaborates on the development of steel structure reliability direction;Fire resistance of steel structure component design method and calculation steps are illustrated and summarized.The second chapter mainly introduces the basic properties of the steel structures in fire conditions including mechanical properties and physical mechanical properties and the parameters of the steel members under high temperature is given change form;By comparing the national standard reference to choose suitable for the article content required specification and physical parameter calculation formula of value.The third chapter introduced according to the basic theory of heat transfer thermal radiation and convection heat transfer method and calculation formula of the two;Steel structures at high temperature is given under the standard temperature curve and steel structure in the presence of protective layer of warming formula;Under the condition of high temperature axial compression was studied at the same time the critical bearing capacity of steel members and the overall stability of the formula.The fourth chapter based on the elastic-plastic compression bar bending instability of the double modulus theory is discussed,through the model of research on steel structure of compressive bar elastic-plastic buckling are analyzed and deduced under the condition of high temperature compressive bar steel structure elastic-plastic buckling analysis.The fifth chapter is based on the ANSYS finite element analysis method,under the condition of high temperature with one end fixed edge,hinged at one end of the axial compression columns for example,under the action of different protective layer are analyzed,the high temperature,the temperature field of the steel column analysis,static analysis and stability analysis.