Finite Element Research On Temperature Field Distribution Of Steel Columns Filled With Concrete Under Fire Condition

In this thesis,the theory of finite element method about temperature fieldanalyses is explained,proceeding from basic equation of the heat-conduction question,so the general format of finite element of calculating the temperature field of thetransient state is tried to achieve. And taken two-dimensional question as an example,the equation group of finite element about the temperature field of the transient statedefinitely by temperature fields of concrete-filled steel member in case of hightemperature is solved, determining steel tube distribute issue type, solved terms andmethod of solving. According to the thermal performance of steel and concretematerial under high temperature, the concrete-filled steel element model is analyzedby using the powerful analysis software on the basis of finite element theory, and themain law that the concrete-filled steel member temperature field was distributed underthe high temperature is drew, so the factor mainly influencing temperature fielddistribution gotten. Result is verified by experimental data. 　 Material mechanics performance of concrete-filled steel member under the hightemperature of fire is presented on the basis of analyzing in temperature field, and abasic method on computing the fire-resistant limit has been put forward, making thecomplicated theoretical question simple to solve by the premise that the concept isclear, the precision is reliable In order to facilitate the analysis of the temperature distribution in concrete-filledsteel member, an application program is developed, specially used to input FEAmodel data turning the data into file, and transfer finite element program carrying onbackground analyses.