火灾下钢筋混凝土框架结构高温力学性能数值模拟研究

建立一个单层双跨钢筋混凝土框架模型，基于钢筋和混凝土材料的热工性能和高温力学性能，运用ABAQUS 有限元软件对框架结构进行单室和多室火灾模拟，研究不同火灾工况下，梁、柱构件及整体结构的温度场分布、变形特征和内力变化规律。结果表明：框架结构在单跨受火及双跨受火两种不同受火情况下，双跨受火梁及边柱的温度场与单跨受火时相同，而中柱及节点核心区的温度分布存在差异；节点核心区温度较周围的梁段和柱段明显偏低；受火方式及框架柱的轴压比对框架结构高温力学反应存在显著影响。

Numerical simulation of high temperature mechanical properties of reinforced concrete frame structure under fire

A single layer double span reinforced concrete frame model was established. Based on the thermal performance and high temperature mechanical properties of steel and concrete materials, and using ABAQUS finite element software, the single compartment fire and multi-compartment fire were simulated. The temperature field distribution characteristics and change law of internal force and deformation of beam and column members andwhole structure were studied under different conditions. Results showed that under the two different fire cases of the single span and double span of the fire, the temperature field of the double span beam and side column under fire is the same as that of single span under fire, and the temperature distribution of the central column and the joint core area is different. The temperature of the joint core area is obviously lower than that of the surrounding beam and column. The fire mode and axial compression ratio of frame column plays a significant role in high temperature mechanics response of frame structure.