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针对目前石化建筑结构采用的传统“处方法”防火设计,存在着有时设防过度造成浪费,有时又设防不足造成不安全的情况,应用基于塑性极限上限分析,利用基本破坏机构迭加的方法,通过非线性规划求解,寻找内力功最小值对应的破坏机构,考虑火灾时材料强度降低的非线性特征和弹性模量的不断减小,采用迭代法确定结构的耐火极限时间。用编制的钢框架计算程序,对兰州石化乙烯装置钢框架管廊整体结构进行了抗火验算和性能化设计。提出了主体结构的概念和上限钢框架整体结构抗火验算的实用设计方法,研究了烃类火荷载取值,对烃类火灾结构温度场进行了模拟,通过计算确定了装置内不同区域钢框架结构的保护范围,保证了事故火灾时整体结构的抗火安全性,同时取得了较好的经济效果。
According to the traditional “method” fire protection design adopted in the petrochemical building structure, there are occasions sometimes caused by waste of fortification caused by excessive overflight, and sometimes unsafe caused by lack of fortification. Based on the upper limit analysis of plastic limit and the method of using the basic destroy mechanism, , Through the non-linear programming, find the failure mechanism corresponding to the minimum value of internal force, consider the non-linear characteristics and elastic modulus of material strength reduction in fire, and use iterative method to determine the refractory limit time of the structure. With the calculation program of the steel frame, the overall structure of Lanzhou Petrochemical ethylene plant steel frame pipe gallery was inspected and performance design was conducted. The concept of the main structure and the practical design method of anti-fire checking for the upper limit of the overall structure of the steel frame are proposed. The value of the fire load of the hydrocarbon is studied and the temperature field of the hydrocarbon fire structure is simulated. The steel framework The scope of protection of the structure ensures the fire safety of the overall structure in case of an accident fire and at the same time achieves better economic results.