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为了分析受火后混凝土框架结构的残余力学性能,基于纤维模型的思路,将梁、柱构件截面划分成多个纤维,可以考虑构件截面的不均匀温度场分布以及受火损伤后材料力学性能的变化。以ABAQUS通用有限元软件为开发平台,利用Python编程语言对其进行二次开发,将SAP2000建立的模型文件导入到ABAQUS中,对基于纤维模型的混凝土框架进行受火后的温度场分析和非线性力学分析。通过一个多层多跨三维混凝土框架火灾反应的实例,对该框架在受火后的力学反应进行了分析,可为评估混凝土框架结构受火后的残余力学性能提供参考。
In order to analyze the residual mechanical properties of concrete frame after fire, based on the idea of fiber model, the cross-section of beams and columns is divided into several fibers. The distribution of non-uniform temperature field and the mechanical properties of material after fire damage can be considered Variety. The ABAQUS universal finite element software is used as the development platform, and the secondary development is carried out in the Python programming language. The model file created by SAP2000 is imported into ABAQUS. The temperature field analysis and nonlinearity analysis of the concrete frame based on the fiber model are carried out. mechanical analysis. Through analyzing the fire reaction of a multi-span and multi-span three-dimensional concrete frame, the mechanical response of the frame after being exposed to fire is analyzed, which can be used as a reference to evaluate the residual mechanical properties of the concrete frame structure after fire.