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为了对受火后混凝土框架的残余力学性能进行有效准确的数值模拟,该文基于纤维单元模型和分层壳单元模型的思路,以ABAQUS通用有限元软件为开发平台,利用Python脚本语言对其进行二次开发,建立了混凝土框架火灾受损分析系统(简称ASFCF系统)。为了验证该系统,设计了2个相同尺寸的带楼板的单层单跨空间混凝土框架,一个进行火灾试验(称为火后框架),一个不进行火灾试验(称为常温框架),对这两个框架中的各个梁、板构件按顺序依次进行静载破坏试验;利用ASFCF系统对两个框架分别进行非线性有限元分析,将火后框架与常温框架各个构件的模拟计算结果与试验实测数据进行对比,结果表明:二者的吻合度较高,误差均在可接受的范围之内,说明采用纤维单元模型和分层壳单元模型模拟火灾后框架结构中的梁、柱和楼板是合理有效的,采用ASFCF系统对混凝土框架进行高温后热力耦合分析的计算结果准确、可信,能够较好地用于受火后混凝土框架残余承载力的计算和评估中。
In order to effectively and accurately simulate the residual mechanical properties of fire-damaged concrete frame, based on the idea of fiber unit model and layered shell element model, this paper uses ABAQUS universal finite element software as the development platform and uses Python scripting language Secondary development, the establishment of a concrete frame fire damage analysis system (ASFCF system for short). In order to validate the system, two single-span, single-span SPC frames with floors of the same size were designed, one for fire test (called fire frame), one for fire test (called normal temperature frame) Each frame and each beam and plate were subjected to static load failure test in order. Non-linear finite element analysis of the two frames was carried out by using ASFCF system. The simulation results of the frame and the frame at room temperature were compared with the experimental data The results show that the agreement between them is high and the errors are within the acceptable range, which shows that it is reasonable and effective to simulate the beams, columns and slabs in the frame structure after fire using fiber unit model and layered shell element model The calculation results of thermal coupling analysis of concrete frame with ASFCF after high temperature are accurate and credible, which can be used to calculate and evaluate the residual bearing capacity of concrete frame after fire.