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介绍了利用ABAQUS软件计算平面桁架结构在火灾作用下的极限承载力和耐火极限的方法,并对平面桁架结构进行了火灾作用下的抗火性能分析,得出了在不同火灾温度下的极限承载力和不同荷载比下的耐火极限温度,并对计算结果进行了分析比较。结果表明,20~200℃时,桁架的承载力变化不大,温度在400℃以上,承载能力急剧下降;随着荷载比的增大,结构的耐火极限温度线性降低。
The method of calculating the ultimate bearing capacity and the fire resistance limit of the planar truss structure under fire by using ABAQUS software is introduced. The fire resistance performance of the plane truss structure under the action of fire is analyzed, and the ultimate bearing capacity under different fire temperatures is obtained Force and different load ratio of the fire resistance temperature, and the calculation results were analyzed and compared. The results show that the load-carrying capacity of truss has little change when the temperature is between 20 ℃ and 200 ℃, and the bearing capacity decreases sharply when the temperature is above 400 ℃. With the increase of load ratio, the fire-resistant limit temperature decreases linearly.