网壳结构火灾反应非线性有限元分析

Nonlinear Finite Element Analysis of a Reticulated Shell Subjected to a Fire

采用欧洲钢结构协会推荐的钢材高温材料模型确定了钢材的弹性模量和极限强度。通过对导热微分方程进行数值求解,确定了结构钢构件内部的温度场。在此基础上,采用非线性有限元方法分析了空间网壳结构的火灾反应。结果表明,在火灾作用下,网壳结构的承载力迅速降低并最终导致结构的倒塌。

The structural respon.ses of a reticulated shell subjected to a fire are actively analyzed in this study through numerical investigation. The analytical model suggested by the European Convention for Constructional Steelwork is utilized to determine the Young＇s modulus and yield strength of steel material. The differential equation of heat transfer is numerically solved based on finite element method for exploring the temperature fields of concerned steel components. Following the obtained understandings, the structural responses of the reticulated shell subjected to a fire are analyzed by using the well-accepted nonlinear finite element method. The observations made from the study clearly demonstrate that the force-bearing capacity of the shell will dramatically reduce with the increasing material temperature and the entire shell will eventually collapse due to the loss of member strength.