摘要
为研究支承刚度对两向正交斜放网架抗火性能的影响,利用非线性有限元分析软件ANSYS,建立两向正交斜放网架火灾高温下的热-结构耦合有限元计算模型,考虑不同荷载比下支承刚度的影响,对该模型在火灾均匀温度场中的全过程反应进行数值模拟计算,得到不同参数条件下两向正交斜放网架结构的临界温度及结构变形的特征.结果表明,采用同种支承刚度的两向正交斜放网架时,荷载比越小,临界温度越高,抗火性能越好;在相同荷载比情况下,两向正交斜放网架的临界温度值随着支座法向支承刚度的逐渐增大而呈现降低的趋势.
To research the fire-resistant behavior of bi-orthogonal-diagonal lattice grids with distinctive bearing stiffness conditions,a numerical model for fire-structure coupling analysis of it under the large space fire is established by using the nonlinear finite element software ANSYS,and then the whole structural reaction process of bi-orthogonal-diagonal lattice grids in uniform temperature field is numerically simulated and analyzed by considering the influence of different loading radio.As a result,the critical temperature of bi-orthogonal-diagonal lattice grids is obtained with different parameters,while the rule of variation of displacement within the grids in uniform temperature field is also studied in the paper.The numerical results show that the critical temperature of two-way orthogonal-diagonal lattice grids will be increased with the loading radio increases for a certain support condition.The bi-orthogonal-diagonal lattice grids with smaller bearing stiffness have a higher critical temperature no matter how large the loading radio,and the grids deserve a superior fire-resistant behavior.
作者
孙伟建
邵辉田
SUN Wei-jian;SHAO Hui-tian(,China Jinmao Qingdao266100,China;,Jimo Sales Department of CITIC Securities Co.,Ltd.,Qiaodao266200,China)
出处
《青岛理工大学学报》
CAS
2018年第3期43-45,52,共4页
Journal of Qingdao University of Technology
关键词
抗火性能
数值模拟
两向正交斜放网架
支承刚度
fire-resistant performance
numerical simulation
bi-orthogonal-diagonal lattice grids
bearing stiffness
