论文部分内容阅读
常温条件下,网架结构的拟夹层板法具有精度高、计算方便等特点,广泛应用于工程实际,但是高温条件下结构钢的性能蜕化,拟夹层板法的应用受到限制.将拟夹层板法位移计算离散化,提出一个适用于高温条件下的位移计算公式.以典型的正放四角锥网架结构为研究对象,考虑高温下材料热力学参数,选取材料弹塑性本构模型,采用几何非线性计算方法,通过对常温下拟夹层板法位移公式的修正,得到火灾高温下网架结构位移的简化计算方法.计算高温过火后网架结构有限元分析得到的位移值,统计有限元结果与拟夹层板法的比值,得到基于拟夹层板法的火灾后网架结构跨中位移的简化计算方法.
Under normal temperature conditions, the proposed sandwich method with grid structure has the advantages of high precision and convenient calculation, which is widely used in engineering practice, but the performance of structural steel degenerates under high temperature conditions and the application of the proposed sandwich method is limited. Displacement calculation method is proposed, and a displacement calculation formula suitable for high temperature conditions is proposed. Taking the typical square pyramid truss structure as the research object, considering the material thermomechanical parameters at high temperature, the material elastic - plastic constitutive model is selected, Linear calculation method, the simplified calculation method for the displacement of the grid structure under high temperature in fire is obtained by amending the displacement formula of the sandwich plate method under normal temperature.Calculation of the displacement value of the finite element analysis of the grid structure after the high temperature is over, the statistical finite element results The method of simulating the mid-span displacement of post-fire grid structure based on the quasi-sandwich method is obtained.